BMW Cooling System Parts & Accessories for BMW 5 Series E39 (1996-2003)

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The cooling system is arguably the weakest point in numerous BMWs. If you drive an aging BMW or plan on taking your car to the track like we do, we recommend beefing up your cooling system before going to the track. Generally, the main components in your cooling system that are prone to failure include the following: expansion tank, factory hoses, water pump, thermostat, fan (especially if your vehicle comes factory with a clutch fan), and radiator. Factory BMW expansion tanks are plastic and prone to either breaking off at connection points or combusting. As factory rubber hoses age they either crack or break over time - we offer silicone cooling hose upgrades for most applications to avoid future failures. If you have an older vehicle, your water pump likely comes from the factory with a plastic impeller - we offer upgraded water pumps with metal impellers that are far more reliable. Newer model BMWs utilize electric water pumps - BMW spent millions of dollars engineering these water pumps, but they fail so often that we recommend replacing at 60,000 mile service intervals to avoid being stranded on the side of the road. In terms of thermostats, we offer various upgraded thermostats for racing applications. If your BMW utilizes a clutch fan from the factory, we have several options available in terms of universal electric fans - we recommend replacing these to avoid sending brittle plastic fan blades through your hood. For radiators, we recommend swapping out your radiator for one that does not use plastic connection points like your factory radiator.

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Thermostat Replacement Kit - E39 M5
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T#:554086
Part#: 11537835558KT7
Ships in 3 Business Days
$ 170.99

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04-21-2026

$ 158.99 USD
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$ 158.99 USD
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When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

Kit includes:

  • Behr thermostat with gasket
  • Thermostat mounting hardware
  • 1 Gal Genuine BMW coolant

 

This thermostat fits the following BMWs: 
1998-2004 E39 BMW M5 

 

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Basic Cooling System Service Kit - E39 540i (09/1998+)
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:557233
Part#: E39540BCKT2
Ships on Oct 7, 2026
Sale - Save 13% $ 389.99

This product was last offered at the strikethrough price on
05-03-2026

$ 340.78 USD
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Sale - Save 13%
$ 389.99

This product was last offered at the strikethrough price on
05-03-2026

$ 340.78 USD
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Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

See kit contents below for all included components.

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Packaged by Turner - Corporate Logo
T#:557232
Part#: E39M5XBCKT
In Stock
Sale - Save 12% $ 352.99

This product was last offered at the strikethrough price on
05-03-2026

$ 311.86 USD
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Sale - Save 12%
$ 352.99

This product was last offered at the strikethrough price on
05-03-2026

$ 311.86 USD
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Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

See kit contents below for all included components.

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Performance Water Pump & Thermostat Kit - BMW M50 M52
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:30397440
Part#: 11517527799KT2
In Stock
$ 357.99

This product was last offered at the strikethrough price on
06-15-2026

$ 344.99 USD
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$ 344.99 USD
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BMW vehicles are known for their robust performance, but the water pump is a notorious weak spot, often needing replacement every 60,000 miles.

During this service, it's wise to also swap out the thermostat to maintain the efficiency of your vehicle's cooling system. Turner Motorsport simplifies this process with our expertly curated Water Pump & Thermostat Replacement Kit.

This premium kit centers around the renowned EMP Stewart high-performance water pump--a favorite among BMW enthusiasts for its exceptional design. Featuring a stainless steel impeller, this pump enhances coolant flow by 20%. Complementing this is a low-temperature 68°C (154.4°F) Mishimoto thermostat, an upgraded aluminum thermostat housing, and Redline Water Wetter coolant additive. Together, these components make for the ultimate cooling system upgrade for your E36, E39, or Z3!

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Packaged by Turner - Corporate Logo
T#:557221
Part#: E39528BCKT
Ships in 6 Business Days
Sale - Save 16% $ 259.99

This product was last offered at the strikethrough price on
05-03-2026

$ 219.01 USD
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Sale - Save 16%
$ 259.99

This product was last offered at the strikethrough price on
05-03-2026

$ 219.01 USD
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Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

See kit contents below for all included components.

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Packaged by Turner - Corporate Logo
T#:338714
Part#: TMS14418
Ships in 3 Business Days
$ 1,201.99

This product was last offered at the strikethrough price on
06-05-2026

Starting at $ 1,132.44 USD
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Starting at $ 1,132.44 USD
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This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1999-2003 E39 M5 with the S62 engine.

A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Keep on top of the cooling needs of your engine for your own piece of mind. Potential buyers also see the upside of a properly maintained car with receipts. Our bundled package includes the following:
  • OEM Behr radiator
  • OEM Laso or OE BMW water pump with gasket
  • OE BMW coolant temp sensor (located in the water pump housing)
  • OEM Behr thermostat with o-ring
  • OE BMW o-rings for the inner coolant tubes
  • OE BMW expansion tank cap
  • OE BMW upper and lower radiator hoses with OE-style clamps
  • OE BMW expansion tank hose with OE-style clamps
    Optional items (which can be added below):
    - OE BMW antifreeze
    - Add a new coolant level sensor (known for failing / throwing "check coolant" messages)
    - Add a new plastic expansion tank (if it's never been changed it's a risk of a crack or leak)
    - Add a new fan clutch

    Buy as a package and save $$$!

    This cooling system overhaul kit fits the following BMWs:
    1999-2003 E39 BMW M5
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    Packaged by Turner - Corporate Logo
    T#:338704
    Part#: TMS14417
    Ships on Oct 7, 2026
    Sale - Save 9% $ 773.99

    This product was last offered at the strikethrough price on
    05-03-2026

    Starting at $ 706.72 USD
    Sale - Save 9%
    $ 773.99

    This product was last offered at the strikethrough price on
    05-03-2026

    Starting at $ 706.72 USD
    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1999-2003 540i with the M62TU VAN0S 4.4-liter engine. This package applies to cars equipped with either the manual or automatic transmission (select the appropriate parts in the menu below).

    A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Our bundled package includes the following:
  • OEM Behr radiator (select for manual or automatic transmission)
  • OEM water pump (choose either the metal or composite impeller)
  • OE BMW coolant temp sensor (located in the water pump housing)
  • OEM Behr thermostat with housing and sensor
  • OEM Behr expansion tank with cap
  • OE BMW upper and lower radiator hoses with expansion tank hose
    Optional items (which can be added below):
    - OE BMW antifreeze
    - Add a new coolant level sensor (known for failing / throwing "check coolant" messages)
    - Replace the heat exchanger coolant lines for the automatic transmission
    - Add a new fan clutch

    Buy as a package and save $$$!

    This cooling system overhaul kit fits the following BMWs:
    1999-2003 E39 BMW 540i
    1999-2001 E38 BMW 740i 740il
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    Coolant Expansion Tank - E36/E39/Z3 6 cylinder 1992-1998
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:338018
    Part#: 17111723520
    Ships in 1 Business Day
    $ 97.99

    This product was last offered at the strikethrough price on
    05-03-2026

    Starting at $ 63.18 USD
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    Starting at $ 63.18 USD
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    This high quality BEHR brand expansion tank is used on M50, M52, S50 and S52 engines, and is a common failure item on all E36 3 series with 6 cylinder engines (325/328/323 and M3) 1992-1999, Z3 with 2.8 liter, MZ3 Roadster/Coupe (S52), and E39 528i from 1997-1998. BEHR was the original equipment supplier to BMW, so you know the BEHR made expansion tank will be the highest quality available. Be leary of competitors selling this part for less -- is it a BEHR? Probably not. We only carry the BEHR brand expansion tank as it is the only one we use in our own BMWs.

    If you are overhauling your coolant system, now is the time to consider preventative replacing this expansion tank. These are known to go bad, causing a leak which can leave you stranded. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on.

    Need a new coolant level sensor too? If your coolant level sender is bad, your on board computer will constantly display a "low coolant" message (unless your coolant is actually low...). If you're replacing your expansion tank, now is a great time to replace this failure prone sensor. If you want a new coolant level sensor, simply choose from the option below. Because there are different sensors for different year/model BMWs, please be as specific as possible when you give us your car info during checkout (model, year, production date). Thanks!


    This item fits the following BMWs:
    1992-1998 E36 BMW 323ic 325i 325is 325ic 328i 328is 328ic M3
    1997-1998 E39 BMW 528i
    1997-1998 Z3 BMW Z3 2.8
    1998-2000 Z3 BMW M Roadster M Coupe (S52)
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    Water Pump - E39 540i E38 740i/il E53 X5 4.4i 4.6is
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:348558
    Part#: 11510393336DK
    Ships in 3 Business Days
    $ 192.99

    This product was last offered at the strikethrough price on
    07-15-2026

    Starting at $ 180.98 USD
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    Starting at $ 180.98 USD
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    Don't take your car's cooling system for granted!One of the biggest weak points is the cooling system. Replacing your water pump will go a long way for keeping your car on the road and operating properly. This water pump fits BMW 1999-2001 E38 740i/740iL, 1999-2003 E39 540i, 1999-2003 E53 X5 4.4i and 4.6is with M62TU 4.4L (4.6L for the 4.6is) engine.

    Choose from a water pump with a metal or composite impeller.
    This water pump comes complete with housing profile gasket and o-rings.

    This item fits the following BMWs:
    1999-2003  E39 BMW  540i 540i touring
    1999-2001  E38 BMW  740i 740il
    2000-2003  E53 BMW  X5 4.4i X5 4.6is
    2000-2003  E52 BMW  Z8 Alpina
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    Packaged by Turner - Corporate Logo
    T#:338705
    Part#: TMS16592
    Ships in 3 Business Days
    Sale - Save 5% $ 171.99

    This product was last offered at the strikethrough price on
    08-13-2026

    Starting at $ 163.48 USD
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    Sale - Save 5%
    $ 171.99

    This product was last offered at the strikethrough price on
    08-13-2026

    Starting at $ 163.48 USD
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    The oil cooler/heat exchanger for the automatic transmission is one of the most overlooked sections of the 540i and 740i cooling system. The cooler (heat exchanger) is a part of the overall cooling system and uses coolant circulated from the regular cooling system to cool the transmission oil running through this small cooling block. Some of the hoses are shared with the rest of the cooling system as well. The E38/E39 heat exchanger is located along the driver's side frame rail and is accessed from the wheel well. We recommend servicing or cleaning the heat exchanger along with any cooling system overhaul. Or if you're having transmission faults (especially for temperature) you may want to clean the transmission cooler anyway and these hoses will be a nice finishing touch.

    Replacing or cleaning the heat exchanger components could lead to better shifting of the automatic as the cooler itself can become clogged. If you're experiencing harder or hesitating shifts, and the internal transmission temperature is rising without being regulated, the components in this system are the likely cause. Staying on top of the cooling needs of the transmission will help prevent a very costly transmission repair in the future. These hoses are easily replaced and you can clean the heat exchanger easily with brake cleaner and some brushes.

    Included in this handy package are:
  • 11531711381 - transmission cooling hose from water pump to radiator (with t-connector)
  • 11531711385 - transmission cooling hose from radiator to cooler
  • 11531711384 - transmission cooling hose from cooler to water pump
  • 11537511207 - transmission cooling hose from cooler to chassis
  • hose clamp
  • o-ring


    This hose set fits the following BMWs:
    1999-2003 E39 BMW 540i
    1999-2001 E38 BMW 740i 740il
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    Packaged by Turner - Corporate Logo
    T#:30463918
    Part#: 11510393340KT3
    Ships in 3 Business Days
    $ 266.99 USD
    Free Shipping on orders $49 and up
    $ 266.99 USD
    Free Shipping on orders $49 and up

    Maintain your BMW's cooling system and avoid costly repairs with our all-inclusive Water Pump and Thermostat Replacement Kit, expertly crafted by enthusiasts at Turner Motorsport. Designed specifically for your BMW model, this kit ensures proper engine operation at optimal temperatures, preventing overheating and extending engine life.

    Key Benefits:

    Comprehensive Kit: Simplify your cooling system overhaul with all necessary components in one package. High-Quality Parts: Each component meets or exceeds OEM standards, ensuring reliable performance and longevity. Optimal Cooling Performance: Regular water pump and thermostat replacement every 60,000 miles maintains peak cooling efficiency. Enhanced Reliability: Premium components like the Wahler Thermostat and Graf Water Pump ensure durable, long-lasting performance. Why Choose This Kit:

    Maximize Cooling System Performance: Replacing your water pump and thermostat simultaneously ensures your BMW’s cooling system operates efficiently. Protect Your Engine: Properly flushing and refilling your cooling system with Genuine BMW coolant guarantees optimal freeze protection and corrosion resistance. Convenient and Cost-Effective: Combining all essential parts in one kit simplifies maintenance and ensures a thorough, lasting repair. Planning a cooling system overhaul? Opt for this comprehensive thermostat and water pump replacement kit for a lasting repair.

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    Cooling System Overhaul Kit - E39 M5
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:554556
    Part#: 17111436062KT2
    Back Ordered
    $ 2,392.99

    This product was last offered at the strikethrough price on
    08-14-2026

    $ 2,317.99 USD
    $ 2,317.99 USD
    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1999-2003 E39 M5 with the S62 engine. 

    A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Keep on top of the cooling needs of your engine for your own piece of mind. Potential buyers also see the upside of a properly maintained car with receipts. 
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    Heater Hard Line replacement Kit
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:15777306
    Part#: 11531705210-KT
    Ships on Nov 12, 2026
    $ 259.99

    This product was last offered at the strikethrough price on
    04-28-2026

    $ 251.99 USD
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    $ 251.99 USD
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    Includes every thing needed to replace heater coolant hard lines, includes gaskets, hoses, and a URO aluminum return line!
    Packaged by Turner - Corporate Logo
    T#:554073
    Part#: 11537509227KT3
    Ships on Feb 23, 2027
    $ 103.99 USD
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    $ 103.99 USD
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    When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

    Kit includes:

    • Mahle-Behr thermostat with gasket
    • Thermostat mounting hardware
    • 1 liter of coolant

    Applications:
    1999-2003 E39 528i, 525i, 530i sedan, touring wagon (M52TU engine, M54 engine)
    1999-2005 E46 323, 328, 325, 330 sedan, coupe, cabrio, touring wagon (M52TU engine, M54 engine)
    2004-2005 E60 525i, 530i sedan, touring wagon (M54 engine)
    2001-2006 E53 X5 3.0 (M54 engine)
    2004-2006 E83 X3 2.5i X3 3.0i (M54 engine)
    1999-2002 Z3 2.3. Z3 2.5i, 2.8 Z3 3.0i (M54 engine)
    2003-2005 Z4 2.5i, Z4 3.0 (M54 engine)

     

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    High Performance Metal Water Pump & Pulley Kit - M54
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:55749612
    Part#: 888010330KT3
    In Stock
    New Item
    $ 299.99 USD
    Free Shipping on orders $49 and up

    Valley Pan Service Kit - Level 2
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:15777315
    Part#: 11141742042-KT
    Ships on Oct 7, 2026
    $ 464.99

    This product was last offered at the strikethrough price on
    04-06-2026

    $ 456.99 USD
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    $ 456.99 USD
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    Valley pan gaskets are a common failure on the M62 motors, Symptoms can include a smell of coolant regularly or a mysterious loss of coolant with no identifiable leaks. This kit contains the basics need to be replaced when doing a valley pan gasket. The included Geba water pump has a metal impeller to replace the failure prone plastic OEM impeller. It is always a good idea to replace the accessory belts when ever they need to be removed to ensure proper tension and belt integrity. Kit includes Valley pan with rubber gasket: updated valley pan alleviates the core of the issue - the design! Valley pan securing hardware Valley pan heat shield Water pipe o-rings Water cross over gaskets Throttle body gasket Geba water pump with gasket Intake gaskets Accessory belt A/C belt
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    Packaged by Turner - Corporate Logo
    T#:557230
    Part#: E39540BCKT
    Ships in 2 Business Days
    Sale - Save 11% $ 449.99

    This product was last offered at the strikethrough price on
    04-21-2026

    $ 398.70 USD
    Free Shipping
    Sale - Save 11%
    $ 449.99

    This product was last offered at the strikethrough price on
    04-21-2026

    $ 398.70 USD
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    Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

    To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

    See kit contents below for all included components.

    Show More Show Less
    Cooling System overhaul Kit - E39 528i From 09/1998
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:554546
    Part#: 11517527910KT17
    Back Ordered
    Sale - Save 5% $ 1,016.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 969.76 USD
    Sale - Save 5%
    $ 1,016.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 969.76 USD

    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the E39 528i with the M52 engine. 

    A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Keep on top of the cooling needs of your engine for your own piece of mind. Potential buyers also see the upside of a properly maintained car with receipts. 

     

    This kit fits the following BMWs:

    09/1998 - 2000 E39 528i

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    Packaged by Turner - Corporate Logo
    T#:338700
    Part#: TMS14414
    Ships in 1 Business Day
    $ 597.99

    This product was last offered at the strikethrough price on
    06-15-2026

    Starting at $ 587.60 USD
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    Starting at $ 587.60 USD
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    This is a compete cooling system overhaul kit, which includes all the common M52 cooling system failure parts bundled into a complete package. This cooling system package is for the 1997-1998 528i with the M52 engine with either the manual or automatic transmission.

    Much of the E39 cooling system is shared with the 3-series cars of the same era. Which means the potential for serious cooling system and engine-related failures. Several of the primary cooling components are prone to failure within 60k miles (or less in many cases). A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the radiator & waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your cooling system. Our kit includes one OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat, radiator cap, and new radiator hoses.

    Basic Kit Contents:
    17111702969, radiator (OEM Behr)
    11517527799, water pump (OE BMW)
    11537511580, 88�C thermostat (OEM Behr/Hella)
    11531740832, upper radiator hose (OEM Rein/CRP)
    11531740481, lower radiator hose (OEM Rein/CRP)
    17111427156, expansion tank hose (OEM Rein/CRP)
    17111742231, expansion tank cap (OEM Behr/Hella)

    Cooling Kit Options:
    E39 Water Pump Options
    (click to expand)
    OE BMW with composite impeller. The original BMW water pumps had plastic impellers which degraded and failed. The latest design uses composites that are much better and will not corrode. Compared to a metal impeller, the composite is lighter so it's more efficient and it will not wear out the bearings. We don't even offer the metal impeller pumps with this kit because the BMW composite one is so much better.
    Stewart high performance. The ultimate in M50 water pumps! It features a stainless steel impeller, heavy-duty bearings, a better o-ring seal, and flows 20% more than the stock pump. If indestructible is what you're looking for, this is the pump to go with. It also comes with a lifetime warranty for piece of mind.
    E39 Expansion Tank
    (click to expand)
    The original expansion tank is prone to cracks and leakage. Again - it's made from a weak plastic. The material has improved over the years but the only option remains an OEM plastic tank. It's a good idea to replace it if you're doing a whole overhaul. Don't re-use the original tank if you're going to the trouble of replacing everything else!
    E39 Thermostat Housing
    (click to expand)
    The original BMW plastic thermostat housing is brittle and does not seal well. We only sell it under protest. Instead we've been selling this aluminum housing for the last 20+ years. The aluminum does not have the same shortcomings as the plastic one. We made this item an option in case you already have the aluminum housing.

    Use the options below to build your cooling package.

    This cooling system overhaul kit fits the following BMWs:
    1997-1998 E39 BMW 528i
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    Thermostat Replacement Kit - E39 540i 1999-2003
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:554085
    Part#: 11531436386KT3
    In Stock
    Sale - Save 24% $ 119.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 91.11 USD
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    Sale - Save 24%
    $ 119.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 91.11 USD
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    When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

    Kit includes:

    • Rein thermostat
    • Thermostat mounting hardware
    • 1 liter of coolant

     

    This item fits the following BMWs: 
    1999-2003  E39 BMW  540i 
     

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    Thermostat Replacement Kit - E39 540i 1996-1998
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:554083
    Part#: 11531437526KT2
    Ships in 2 Business Days
    Sale - Save 2% $ 189.99

    This product was last offered at the strikethrough price on
    05-29-2026

    $ 186.20 USD
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    Sale - Save 2%
    $ 189.99

    This product was last offered at the strikethrough price on
    05-29-2026

    $ 186.20 USD
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    When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

    Kit includes:

    • Behr thermostat with O-ring
    • Thermostat mounting hardware
    • 1 Gallon BMW coolant

     

    This item fits the following BMWs: 

    1997-1998  E39 BMW  540i

     

     

    When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

    Kit includes:

    • Behr thermostat with O-ring
    • Thermostat mounting hardware
    • 1 Gallon BMW coolant
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    Packaged by Turner - Corporate Logo
    T#:338706
    Part#: TMS14416
    Back Ordered
    Sale - Save 4% $ 660.99

    This product was last offered at the strikethrough price on
    06-13-2026

    Starting at $ 635.10 USD
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    Sale - Save 4%
    $ 660.99

    This product was last offered at the strikethrough price on
    06-13-2026

    Starting at $ 635.10 USD
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    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1997-1998 540i with the M62 4.4-liter engine (non-VAN0S). This package applies to cars equipped with either the manual or automatic transmission (select the appropriate parts in the menu below).

    A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system.

    Basic Kit Contents:
    1711702969, radiator (OEM Behr)
    11510393340, water pump (OEM)
    13621703993, coolant temp sensor (located in the water pump housing)
    11531437526, thermostat with housing and sensor (OEM Behr/Hella)
    11531745595, upper radiator hose (OEM)
    11531741409, lower radiator hose (OEM)
    11531741404, expansion tank hose (OEM)
    17111741167, expansion tank (OEM Behr)
    17111742231, expansion tank cap (OEM Behr)

    Cooling Kit Options:
    540 Water Pump Options
    (click to expand)
    There are three versions of the water pump for the early 1997-1998 540i: OEM plastic impeller, updated metal impeller, and the more recently updated composite impeller. We recommend either the metal or composite impeller. These are what we use the most in our shop and what our technicians are comfortable with. On more recent models, BMW has used the composite impeller as original. There doesn't seem to be evidence of the plastic failing on this design (it did on the E36 3-series) but we feel most comfortable with the other options. Both the metal and composite manufacturers are OEM for BMW.

    Use the options below to build your cooling package.

    Buy as a package and save $$$!

    This cooling system overhaul kit fits the following BMWs:
    1997-1998 E39 BMW 540i
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    Packaged by Turner - Corporate Logo
    T#:338701
    Part#: TMS14415
    Back Ordered
    $ 708.99

    This product was last offered at the strikethrough price on
    07-15-2026

    Starting at $ 688.50 USD
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    Starting at $ 688.50 USD
    Free Shipping
    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1999-2000 528i with the M52TU engine and the 2001-2003 525i and 530i with the M54 engine. This package applies to cars equipped with either the manual or automatic transmission.

    Much of the later E39 cooling system is strong and reliable and doesn't suffer the same types of problems associated with earlier E39 and E36 systems. But there is still the potential for serious cooling system and engine-related failures. Several of the primary cooling components are prone to failure within 80k miles (or less in many cases). A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Our kit includes an OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat with housing, radiator cap, and new radiator hoses.

    Optional items (which can be added below):
    - Original BMW antifreeze
    - Upgrade the water pump to a Stewart EMP High Performance pump
    - Add a new coolant expansion tank (known for cracking)
    - Add a new coolant level sensor (known for failing / throwing "check coolant" messages)
    - Add a new coolant temp sensor (located in lower radiator hose and the seal ring may cause leaks if re-used)

    This cooling system overhaul kit fits the following BMWs:
    1999-2003 E39 BMW 525i 528i 530i
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    Bav Auto Thermostat With Aluminum Housing - M52TU M54
    For vehicles with production date from 09/1998
    10X Entries Into Our F80 M3 Sweepstakes
    Bavarian Autosport - Corporate Logo
    T#:12544802
    Part#: 11531437040
    In Stock
    Sale - Save 19% $ 104.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 84.99 USD
    Free Shipping on orders $49 and up
    Sale - Save 19%
    $ 104.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 84.99 USD
    Free Shipping on orders $49 and up
    The plastic thermostat cover in your BMW is a known point of failure. Throughout years of repeated contact with hot coolant, the plastic can crack and cause massive coolant leaks and potential overheating. Eliminate one of the weak links in your cooling system with a replacement aluminum thermostat housing. By installing this aluminum unit, you have no worries as far as plastic housing cracks go
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    Bav Auto Coolant Expansion Tank - E36 E39 Z3 M50 M52 S50 S52 ...
    For vehicles with production date up to 08/1998
    10X Entries Into Our F80 M3 Sweepstakes
    Bavarian Autosport - Corporate Logo
    T#:638094
    Part#: 17111723520
    In Stock
    Sale - Save 20% $ 39.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 31.99 USD
    Free Shipping on orders $49 and up
    Sale - Save 20%
    $ 39.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 31.99 USD
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    Replace your old expansion tank to prevent potential failure or leaks. Includes a brand new coolant level sensor. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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    Bavarian Autosport Water Pipe - E46 E39 Z4 Z3 (M52TU, M54)
    10X Entries Into Our F80 M3 Sweepstakes
    Bavarian Autosport - Corporate Logo
    T#:638085
    Part#: 11537502525
    In Stock
    Sale - Save 20% $ 50.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 40.79 USD
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    Sale - Save 20%
    $ 50.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 40.79 USD
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    This plastic water pipe is positioned directly underneath your intake manifold. Due to its plastic construction, it is notorious for catastrophic failure. Rapid cooling loss and overheating are both direct results of this failure, posing permanent and lasting damage to the engine.

    Replace your cracked/broken coolant pipe with this high-quality Bavarian Autosport component to ensure long-term reliability and perfect fitment.

    From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

    Show More Show Less
    Bav Auto Heater Inlet Pipe - E46 E39 E53 E83 E85 Z3
    10X Entries Into Our F80 M3 Sweepstakes
    Bavarian Autosport - Corporate Logo
    T#:638080
    Part#: 11531705210
    In Stock
    Sale - Save 20% $ 40.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 32.79 USD
    Free Shipping on orders $49 and up
    Sale - Save 20%
    $ 40.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 32.79 USD
    Free Shipping on orders $49 and up
    This is the plastic heater inlet pipe that connects the cylinder head to the heater inlet on cars with the M52 or M54 engine. The plastic on this hose becomes brittle over time and eventually leads to failure. Replace yours with a brand new Bav Auto Heater inlet pipe to prevent catastrophic failure.
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    Meyle Radiator Fan Clutch - E31, E32, E34, E38, E39
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:591319
    Part#: 11527502804
    Ships on Sep 16, 2026
    $ 101.99 USD
    Free Shipping on orders $49 and up
    OEM replacement

    Meyle Water Pump - M62
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:579328
    Part#: 11510393336
    Ships on Sep 16, 2026
    $ 106.99 USD
    Free Shipping
    $ 106.99 USD
    Free Shipping
    Don't take your car's cooling system for granted. A waterpump failure can cost you an engine, which is why preventatively replacing your BMWs waterpump and refreshing the cooling system every 60,000 miles. The water pump is a weak point is the cooling system. Replacing your waterpump will go a long way for keeping your car on the road and operating properly.
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    Water Pump and Seal - with upgraded metal impeller - MEYLE
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:579324
    Part#: 11517509985
    Ships on Sep 16, 2026
    $ 52.99 USD
    Free Shipping on orders $49 and up

    Ensure the optimal performance of your BMW by addressing the crucial component of the water pump. Turner Motorsport provides high-quality water pumps designed to keep coolant flowing smoothly. If left unchecked, a failing water pump can lead to overheating issues, potentially causing damage to engine internals. Common among German vehicles, water pump failure may result in unnecessary visits to the repair shop. Preventive maintenance, especially during timing belt replacements, is essential to avoid rapid coolant temperature rise and potential engine damage.

    • Prevents overheating issues
    • Guards against engine damage
    • Common replacement during timing belt maintenance
    • Ensures smooth coolant flow for optimal engine performance
    • Options for thermostats available on Turner Motorsport's website
    • Convenient coolant replacement options
    • Recommended replacement around 60,000 miles
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    Meyle Coolant Expansion Tank - E36, E39, Z3
    Up to production date 09/1998
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:556111
    Part#: 17111723520
    Ships on Sep 16, 2026
    $ 34.99 USD
    Free Shipping on orders $49 and up
    $ 34.99 USD
    Free Shipping on orders $49 and up
    Does not include cap or coolant level sensor
    Bav Auto Coolant Temperature Sensor - M52/S52, M62, M73, M54, S62 ...
    Located on water pump housing For vehicles with production date from 09/1998
    10X Entries Into Our F80 M3 Sweepstakes
    Bavarian Autosport - Corporate Logo
    T#:639828
    Part#: 13621703993
    Ships on Sep 28, 2026
    Sale - Save 20% $ 20.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 16.79 USD
    Free Shipping on orders $49 and up
    Sale - Save 20%
    $ 20.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 16.79 USD
    Free Shipping on orders $49 and up
    This is the coolant temperature sensor used in many BMW models from the mid-1990s to the mid-2000s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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    Bav Auto Coolant Level Sensor - BMW E36 E39 M50/52 S50/52
    For vehicles with production date up to 09/1998
    10X Entries Into Our F80 M3 Sweepstakes
    Bavarian Autosport - Corporate Logo
    T#:639793
    Part#: 61318360855
    In Stock
    Sale - Save 19% $ 20.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 16.99 USD
    Free Shipping on orders $49 and up
    Sale - Save 19%
    $ 20.99

    This product was last offered at the strikethrough price on
    05-03-2026

    $ 16.99 USD
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    This is the sensor / sending unit that notifies the computer if your coolant level is low. When this fails, it can give a false indication of low coolant -- or worse, not inform you of a low coolant situation that could potentially cause overheating. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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    Bavarian Autosport - Corporate Logo
    T#:640208
    Part#: 17117639022
    In Stock
    Sale - Save 15% $ 13.99

    This product was last offered at the strikethrough price on
    06-03-2026

    $ 11.89 USD
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    Sale - Save 15%
    $ 13.99

    This product was last offered at the strikethrough price on
    06-03-2026

    $ 11.89 USD
    Free Shipping on orders $49 and up
    This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.
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    Meyle Expansion Tank Cap
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:579357
    Part#: 3148009004
    In Stock
    Sale - Save 40% $ 14.99

    This product was last offered at the strikethrough price on
    05-15-2026

    $ 8.99 USD
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    Sale - Save 40%
    $ 14.99

    This product was last offered at the strikethrough price on
    05-15-2026

    $ 8.99 USD
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    Replace worn or missing pieces.
    Auxiliary Electric Water Pump
    5X Entries Into Our F80 M3 Sweepstakes
    Meyle - Corporate Logo
    T#:57014181
    Part#: 64116913489
    Ships on Sep 16, 2026
    New Item
    $ 75.99 USD
    Free Shipping on orders $49 and up
    Keep your heating and cooling systems performing sharply with a precision-fit replacement built for long-haul reliability.


    Fluid Level Sensor
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:5973204
    Part#: 17117546548
    Ships on Sep 16, 2026
    $ 13.99 USD
    Free Shipping on orders $49 and up
    MEYLE-ORIGINAL: True to OE fluid level sensor. Used in multiple locations. Wulf Gaertner Autoparts AG manufactures and markets automotive spare parts under its MEYLE brand. Since its foundation in 1958, Wulf Gaertner Autoparts has been an owner-operated, unlisted family business on the aftermarket scene. Since 1995, Wulf Gaertner Autoparts AG has been manufacturing and trading under its MEYLE brand. They pride themselves on top-grade quality-tested spare parts for passenger cars, vans and commercial vehicles. Comparable OE Cross Reference - 17117546548
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    Coolant Level Sensor
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:594511
    Part#: 61318360876
    Ships on Sep 16, 2026
    $ 27.99 USD
    Free Shipping on orders $49 and up
    Monitors the coolant level in the expansion tank. This sensor is critical in keeping tabs of your cooling systems health.
    Coolant Temperature Sensor
    Located on water pump housing For vehicles with production date from 09/1998
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:594615
    Part#: 13621703993
    Ships on Sep 16, 2026
    $ 18.99 USD
    Free Shipping on orders $49 and up
    $ 18.99 USD
    Free Shipping on orders $49 and up
    This is the coolant temperature sensor used in many BMW models from the mid-1990s to the mid-2000s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer.

    This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement.

    This coolant temp sensor fits the following BMWs:
    1996-1999 E36 BMW 323is 323ic 328i 328is 328ic M3, located in cylinder head
    1999-2003 E39 BMW 540i, located on side of water pump
    1999-2001 E38 BMW 740i 740il, located on side of water pump
    1995-1996 E38 BMW 750il, located on side of water pump
    1990-1999 E31 BMW 850i 850ci, located on side of water pump
    2000-2006 E53 BMW X5 3.0i, located in cylinder head
    2000-2006 E53 BMW X5 4.4i/4.6is/4.8is, located on side of water pump
    1997-2002 Z3 BMW Z3 2.5i Z3 3.0i, located in cylinder head
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    Auxillary Fan Switch
    For vehicles with production date from 09/1998
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:4934936
    Part#: 3148210000
    Ships on Sep 16, 2026
    $ 18.99 USD
    Free Shipping on orders $49 and up
    $ 18.99 USD
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    The auxiliary fan switch activates the auxiliary cooling fan to provide additional cooling under high heat loads, and when the car is stationary. Also known as the coolant temperature sending unit, comes with related o-ring
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    BMW - Engine/Cooling
    5X Entries Into Our F80 M3 Sweepstakes
    Meyle - Corporate Logo
    T#:40444296
    Part#: 11531705224
    Back Ordered
    $ 35.99 USD
    Free Shipping on orders $49 and up
    $ 35.99 USD
    Free Shipping on orders $49 and up
    Over the years and with exposure to extremely hot coolant, the coolant hoses in your vehicle can take a beating. Being made of reinforced rubber, these hoses can fail in a number of ways. Splitting at a hose clamp, swelling, cracking, and breaking are just a few of the ways this hose can leave you stranded. Replace it at the first sign of wear to keep your coolant in your engine. With the proper diameter, bends, and lengths, this is the perfect replacement for any swelled or damaged hose. An easy installation, it's piece of mind the next time you are on a long trip or your morning commute.
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