BMW Cooling System Parts & Accessories for BMW Z Series E85/6 (2003-2008)

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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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Water Pump And Thermostat Kit - BMW N52 3.0L
Water Pump And Thermostat Kit - BMW N52 3.0L
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T#:17073598
Part#: 11537549476KT
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$ 318.83 USD
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$ 424.99

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Includes everything you may need to replace your water pump and thermostat.
Water Pump And Thermostat Kit
Water Pump And Thermostat Kit
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T#:5376274
Part#: 11517586925TKT
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$ 337.56 USD
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$ 448.99

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Everything you need to replace your water pump and thermostat. The water pumps in these BMW models are known for failure near 80,000 miles is a very common issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Water pump Genuine BMW coolant thermostat to water pump hose Mounting hardware required for both the thermostat and water pump
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Complete Cooling System Overhaul Package - 2003-4/2004 Z4 2.5 3.0
Complete Cooling System Overhaul Package - 2003-4/2004 Z4 2.5 3.0 ...
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Packaged by Turner - Corporate Logo
T#:339100
Part#: TMS224320
Ships in 1-2 days
Sale - Save 8% $ 515.99

This product was last offered at the strikethrough price on
08-17-2026

Starting at $ 477.24 USD
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$ 515.99

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This is a customizable cooling system overhaul kit, which starts off with the basic radiator and water pump and can be configured to replace all the M54 common cooling system failure parts in one package. This cooling system package is for the 2003-2005 Z4 Roadster.

The Z4 cooling system is much like that of the sister 3 series. 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. Available with our kit is an OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat (complete with housing), radiator cap, new hoses, and other essential cooling parts.

Optional items (which can be added below):
  • Radiator cap
  • Major cooling hoses
  • Original BMW antifreeze
  • Upgrade the water pump to a Stewart EMP High Performance pump
  • Add a new coolant expansion tank (known for cracking)
  • Include a new coolant level sensor (known for failing / throwing "check coolant" messages)
  • Include a new coolant temp sensor (located in the lower radiator hose) (re-using the old sensor and seal may lead to a leak)
  • Add a new thermostat for an automatic transmission (located with the expansion tank).
    This cooling system overhaul kit fits the following BMWs:
    2003-2005 E85 BMW Z4 2.5i Z4 3.0i

    Please put a check in the boxes next to the items you wish to order.
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    Thermostat Replacement Kit - E39 E46 E60 E53 Z3 Z4 With M54, M52TU Engine
    Thermostat Replacement Kit - E39 E46 E60 E53 Z3 Z4 With M54, M52TU En...
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    Packaged by Turner - Corporate Logo
    T#:554073
    Part#: 11537509227KT3
    Ships on Feb 26, 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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    Water Pump And Thermostat Kit
    Water Pump And Thermostat Kit
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:15511872
    Part#: 821414677040KT
    Ships in 4 Business Days
    $ 504.01 USD
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    $ 504.01 USD
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    The water pumps in these BMW models are known for failure near 80,000 miles is a very common issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Water pump Genuine BMW coolant Mounting hardware required for both the thermostat and water pump
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    OEM Style Hose Clamps
    OEM Style Hose Clamps
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    Turner Motorsport - Corporate Logo
    T#:338927
    Part#: HOSE-CLAMPS
    In Stock
    Sale - Save 3% $ 3.99

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

    Starting at $ 3.87 USD
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    $ 3.99

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    06-13-2026

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    Hose clamps for radiator hoses, coolant hoses, vacuum hoses, or intake hoses. These hose clamps are the same style as your OEM hoses with a smooth inside band to prevent cutting into the hose material.
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    Water Pump and Thermostat Package - N51/N52 Engine - E82 128i, E9X 325i/328i/330i, E60 528i
    Water Pump and Thermostat Package - N51/N52 Engine - E82 128i, E9X 32...
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    Packaged by Turner - Corporate Logo
    T#:42873693
    Part#: TMS206099GKT
    Ships in 4 Business Days
    $ 763.36 USD
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    $ 763.36 USD
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    Our water pump/thermostat overhaul includes:

    • Electric Water Pump
    • Aluminum mounting screws for water pump
    • Thermostat
    • Connecting hose from thermostat to water pump 
    • Hose clamps

     

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    Expansion Tank Replacement Kit
    Expansion Tank Replacement Kit
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:15744017
    Part#: N524ECSTNKKT-KT
    In Stock
    Sale - Save 40% $ 166.99

    This product was last offered at the strikethrough price on
    04-03-2026

    $ 100.95 USD
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    Sale - Save 40%
    $ 166.99

    This product was last offered at the strikethrough price on
    04-03-2026

    $ 100.95 USD
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    The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it. The kit includes: Expansion tank with level sensor URO expansion tank cap Genuine BMW expansion tank grommet Genuine BMW mounting bolts
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    Complete Cooling System Overhaul Package - 4/2004-2005 Z4 2.5 3.0
    Complete Cooling System Overhaul Package - 4/2004-2005 Z4 2.5 3.0 ...
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:339099
    Part#: TMS16430
    Ships in 1-2 days
    Sale - Save 8% $ 515.99

    This product was last offered at the strikethrough price on
    08-17-2026

    Starting at $ 477.24 USD
    Free Shipping
    Add to Wish List
    Sale - Save 8%
    $ 515.99

    This product was last offered at the strikethrough price on
    08-17-2026

    Starting at $ 477.24 USD
    Free Shipping
    Add to Wish List
    This is a customizable cooling system overhaul kit, which starts off with the basic radiator and water pump and can be configured to replace all the M54 common cooling system failure parts in one package. This cooling system package is for the 2003-2005 Z4 Roadster.

    The Z4 cooling system is much like that of the sister 3 series. 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. Available with our kit is an OEM Behr radiator, an Original BMW water pump (with updated composite impeller), thermostat (complete with housing), radiator cap, new hoses, and other essential cooling parts.

    Optional items (which can be added below):
  • Radiator cap
  • Major cooling hoses
  • Original BMW antifreeze
  • Upgrade the water pump to a Stewart EMP High Performance pump
  • Add a new coolant expansion tank (known for cracking)
  • Include a new coolant level sensor (known for failing / throwing "check coolant" messages)
  • Include a new coolant temp sensor (located in the lower radiator hose) (re-using the old sensor and seal may lead to a leak)
  • Add a new thermostat for an automatic transmission (located with the expansion tank).
    This cooling system overhaul kit fits the following BMWs:
    4/2004-2005 E85 BMW Z4 2.5i Z4 3.0i

    Please put a check in the boxes next to the items you wish to order.
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    Water Pump & Thermostat Kit - BMW Z3 Z4 S54 3.2L
    Water Pump & Thermostat Kit - BMW Z3 Z4 S54 3.2L
    10X Entries Into Our F80 M3 Sweepstakes
    Packaged by Turner - Corporate Logo
    T#:48194755
    Part#: ZS54WPTKT2
    Ships on Dec 18, 2026
    $ 1,022.99

    This product was last offered at the strikethrough price on
    07-16-2026

    $ 970.99 USD
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    $ 970.99 USD
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    It is important that your coolant system is serviced at regular intervals to ensure a long life. Over time, coolant systems are exposed to high temperatures and repeated thermal cycling, which causes warping, cracking, and hardening of plastics and rubber components in the coolant system. This can lead to coolant leaks and overheating, which can result in extensive engine damage if not resolved in a timely manner. This Water Pump & Thermostat kit helps to address a few of the most problematic parts, replacing these items entirely to keep your cooling system running optimally and efficiently.
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    Race German Lightweight Aluminum Water Pump Pulley
    Race German Lightweight Aluminum Water Pump Pulley
    Race German - Corporate Logo
    T#:27705450
    Part#: M5XLTWWPP
    Back Ordered
    $ 59.99 USD
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    $ 59.99 USD
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    Race German Coolant Temperature Sender Adapter - M12x1.5
    Race German Coolant Temperature Sender Adapter - M12x1.5
    Race German - Corporate Logo
    T#:6827887
    Part#: RGCTSAM12
    Ships in 1-2 days
    $ 35.99 USD
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    $ 35.99 USD
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    Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for M12x1.5 sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor
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    Race German Coolant Temperature Sender Adapter - 1/8NPT
    Race German Coolant Temperature Sender Adapter - 1/8NPT
    Race German - Corporate Logo
    T#:6827888
    Part#: RGCTSA1/8NPT
    In Stock
    $ 35.99 USD
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    $ 35.99 USD
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    Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for 1/8NPT sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor
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    Water Pump and Seal - with upgraded metal impeller - MEYLE
    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 21, 2026
    $ 52.99 USD
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    $ 52.99 USD
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    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 Expansion Tank Cap
    Meyle Expansion Tank Cap
    5X Entries Into Our F80 M3 Sweepstakes
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    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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    $ 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.
    Vaico Lower Radiator Hose - BMW Z4 2.5 3.0 M54
    Vaico Lower Radiator Hose - BMW Z4 2.5 3.0 M54
    For roadster models with production date up to 04/2004
    We Price Match - Give Us A Call or Chat!
    Vaico - Corporate Logo
    T#:363540
    Part#: 17127514405
    Ships in 1 Business Day
    $ 96.99

    This product was last offered at the strikethrough price on
    05-07-2026

    $ 93.99 USD
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    $ 93.99 USD
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    Replace your leaking coolant hose and prevent engine overheating with this replacement Vaico coolant hose.
    Fluid Level Sensor
    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 21, 2026
    $ 13.99 USD
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    $ 13.99 USD
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    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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    Meyle Coolant Hose - BMW N52 3.0L
    Meyle Coolant Hose - BMW N52 3.0L
    5X Entries Into Our F80 M3 Sweepstakes
    We Price Match - Give Us A Call or Chat!
    Meyle - Corporate Logo
    T#:35829327
    Part#: 11537521049
    Ships on Sep 21, 2026
    $ 19.99 USD
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    $ 19.99 USD
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    Over time, coolant hoses in your vehicle can deteriorate due to prolonged exposure to high temperatures from the coolant. Made of reinforced rubber, these hoses are prone to issues such as splitting at hose clamps, swelling, cracking, or even breaking, which can leave you stranded. It's important to replace them at the first sign of wear to prevent coolant loss and ensure your engine stays properly cooled.
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    Meyle - Coolant Inlet Hose Section for various BMW models
    Meyle - Coolant Inlet Hose Section for various BMW models
    5X Entries Into Our F80 M3 Sweepstakes
    Meyle - Corporate Logo
    T#:40478168
    Part#: 11537516414
    Ships on Sep 21, 2026
    $ 7.99 USD
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    $ 7.99 USD
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    This Meyle component offers OEM-level fit and function for hassle-free installation and dependable cooling system performance.
    Coolant Thermostat
    Coolant Thermostat
    5X Entries Into Our F80 M3 Sweepstakes
    Meyle - Corporate Logo
    T#:55461389
    Part#: 11537549476
    Ships on Sep 21, 2026
    New Item
    $ 81.99 USD
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    $ 81.99 USD
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    This Meyle coolant thermostat provides a refresh for your thermal management system, keeping your engine operating exactly where the engineers intended.
    Electric Water Pump
    Electric Water Pump
    5X Entries Into Our F80 M3 Sweepstakes
    Meyle - Corporate Logo
    T#:54959290
    Part#: 313 220 0017
    Back Ordered
    New Item
    $ 326.99 USD
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    $ 326.99 USD
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    Whether you are daily driving or doing a preventative cooling overhaul, this high-quality replacement pump includes fresh mounting hardware to ensure your BMW's cooling system remains reliable.

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