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
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Packaged by Turner - Corporate Logo
T#:17073598
Part#: 11537549476KT
In Stock
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05-03-2026

$ 318.83 USD
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Includes everything you may need to replace your water pump and thermostat.
Water Pump And Thermostat Kit
10X Entries Into Our F80 M3 Sweepstakes
Packaged by Turner - Corporate Logo
T#:5376274
Part#: 11517586925TKT
In Stock
Sale - Save 25% $ 448.99

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05-03-2026

$ 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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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
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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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    Packaged by Turner - Corporate Logo
    T#:554073
    Part#: 11537509227KT3
    Ships on Feb 25, 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
    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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    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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    Packaged by Turner - Corporate Logo
    T#:42873693
    Part#: TMS206099GKT
    Ships in 4 Business Days
    $ 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
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    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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    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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    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
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    This product was last offered at the strikethrough price on
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    Starting at $ 477.24 USD
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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:
    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
    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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    ECS Tuning Aluminum Coolant Bleeder Screw
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:363070
    Part#: 003530ECS01A
    In Stock
    Sale - Save 25% $ 35.99

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

    $ 26.99 USD
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    Replace the flimsy plastic bleeder screw used in the coolant expansion tank or in one of the cooling system hoses with this high quality, durable, aluminum bleeder screw. The stock plastic screw can deform over time due to heat or even regular use. We have even seen the head of the screw snap off, leaving the threaded body stuck in the expansion tank. This aluminum screw will help to prevent sudden failure of the bleeder screw, which can result in immediate overheating of the car.

    ECS Tuning's Aluminum Coolant Bleeder Screw replaces Genuine BMW Part Number 17111712788

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    ECS - Corporate Logo
    T#:556105
    Part#: 024797ECS01
    In Stock
    Sale - Save 25% $ 76.99

    This product was last offered at the strikethrough price on
    06-14-2026

    $ 57.74 USD
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    Some of the biggest issues when owning a BMW can come from cooling system components. Even through years of improvement, the same failure is seen with the plastic fittings and adapters from years of hot to cold temperature fluctuation. The N52/N54/N55/N20 engine sees failure at the plastic cylinder head outlet adapter connecting the cylinder head to the thermostat hose. The stock plastic adapter simply shears off at the end of the barbed fitting, creating a massive coolant leak. The engineering team at ECS Tuning decided a billet aluminum piece was a much better option to contend with the temperature fluctuation. Since other offerings on the market want you to modify your OE hose to be reused, they even developed a silicone replacement hose. These 2 pieces can be purchased separately if you decide to reuse your existing OE hose or in a package kit together for a single click upgrade. Features: Manufactured from billet 6061-T6 with type III anodized for exceptional durability and corrosion resistance. Much stronger part than OEM plastic ​​Will not become brittle and fatigued over time due to thermal cycling. This will prevent the part from breaking during removal and re-installation. Follows OEM form for perfect fitment. Utilizes (and includes) OEM O-ring 11537545278 to ensure a proper seal. Recommended clamp size is 25-40mm
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    Wahler - Corporate Logo
    T#:341054
    Part#: 11537509227
    In Stock
    $ 71.99 USD
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    $ 71.99 USD
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    Stop leaks before they start with this new Thermostat With Housing from Wahler. Despite the fact that most BMW models are brilliant, most have common issues that can plague you during your ownership of the car. This part is one of those issues, as they are known to crack over time. This replacement part is perfect stop a crack and possibly a leak before it starts.
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    ECS - Corporate Logo
    T#:363707
    Part#: 001977ECS03A
    In Stock
    Sale - Save 5% $ 104.99

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

    $ 99.74 USD
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    Most of the pulleys on your BMW engine are plastic, which become brittle and frail over time and from engine bay heat. A failed pulley could leave you stranded which is why it is vital to inspect the pulleys during routine maintenance. This is an aluminum version of the stock water pump pulley used on the M50/M52/M52TU/M54 engine in the E36, E46, Z3, Z4, and other models. It uses the same hardware and the original belt as the stock plastic pulley. But the aluminum will last much longer.
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    Elring Freeze Plug
    2X Entries Into Our F80 M3 Sweepstakes
    Elring - Corporate Logo
    T#:591492
    Part#: 11117530262
    In Stock
    $ 25.99

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

    $ 21.99 USD
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    $ 21.99 USD
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    Replace your missing freeze plug today - 110x13mm
    ECS - Corporate Logo
    T#:640062
    Part#: 008286LA01
    In Stock
    Sale - Save 25% $ 106.99

    This product was last offered at the strikethrough price on
    06-14-2026

    $ 80.24 USD
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    This product was last offered at the strikethrough price on
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    When it comes to cooling system hose replacement, the "U" shaped hose connecting the water pump to the thermostat is usually the first to fail. A lot of this comes from its close proximity to the hot downpipes, while some of this failure comes from the sharp bends in the hose. 

    Why not upgrade when you're due for a replacement? The ECS Tuning silicone hose replacement fixes these issue with two key features in their design. Offering this hose in a much more heat resistant silicone instead of OE rubber and having the hose wrapped in aluminum. The aluminum coating acts as a heat shield to further protect the silicone as well as reducing the temperatures forced on the coolant running through the hose. 

    Replaces OE hose #11537545665

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    Wahler - Corporate Logo
    T#:360524
    Part#: 11531318274
    In Stock
    $ 105.99

    This product was last offered at the strikethrough price on
    06-25-2026

    $ 70.99 USD
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    Replacement 80* Celcius thermostat for E46 M3, Z3M w S54 engine, Z4M. The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.
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    ECS Silicone Radiator Hoses - N52
    For Vehicles With Engine Code N52B30 (Non-SULEV w/o Auxiliary Heating)
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:37723492
    Part#: 008641LA03
    In Stock
    Sale - Save 10% $ 130.99

    This product was last offered at the strikethrough price on
    06-14-2026

    $ 117.89 USD
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    Tired of dealing with brittle, dry-rotted rubber hoses? Whether you're refreshing your cooling system or replacing aging components, this ECS Silicone Radiator Coolant Hose Set is the ultimate upgrade. Designed for durability, performance, and a factory-perfect fit, these premium silicone hoses outperform standard rubber in every way.

    Why Choose Silicone Over Rubber?

    Made from heavy-duty, reinforced 4-ply fluorosilicone, ECS hoses withstand extreme temperatures and pressures far beyond OEM rubber hoses. Engineered to resist oil, fuel, and electrochemical degradation, these hoses are tested for continuous operation at 250°F and over 45 psi, delivering superior reliability, reduced turbulence, and improved coolant flow.

    Key Benefits:

    Direct OE Fitment – Perfectly molded to factory specifications for seamless installation. Enhanced Durability – Heat-resistant silicone prevents cracking, swelling, and deterioration over time. Superior Cooling Performance – Smoother internal passageways improve coolant flow and system efficiency. Pre-Installed Quick-Connect Fittings – Hassle-free installation with OEM-style connectors. Premium Hardware Included – Comes with German-style stainless steel worm-drive hose clamps for a secure fit. Kit Includes:

    Upper Radiator Hose Lower Radiator Hose Pre-Installed Factory "Quick-Connect" Flanges (4) Stainless Steel Worm-Drive Hose Clamps (4) Replaces OEM Part Numbers: 17127531579 & 17127564478

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    BMW E8X E9X Billet Aluminum Radiator Drain Plug
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:367075
    Part#: 013197ECS01A
    In Stock
    Sale - Save 25% $ 47.99

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

    $ 35.99 USD
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    $ 35.99 USD
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    Ensure your BMW's cooling system stays in top shape with ECS Tuning's Billet Aluminum Radiator Drain Plug. Designed specifically for late-model 1-Series and 3-Series BMWs, this replacement plug addresses the common issue of weak plastic drain plugs. Constant exposure to engine heat and road debris makes the plastic plugs brittle, leading to frustration with broken plugs. ECS Tuning's billet aluminum alternative puts an end to these problems.

    • Durable Replacement: Say goodbye to weak plastic drain plugs.
    • Enhanced Material: Billet aluminum provides superior strength and longevity.
    • Deeper Screw Head: Accommodates Phillips head or flat head screwdrivers for better engagement.
    • Reduced Stripping Risk: Minimize the chance of stripping out the screw head.

    Don't let cooling system maintenance be a hassle. Order ECS Tuning's Billet Aluminum Radiator Drain Plug now and experience worry-free service.

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    Aluminized Silicone Water Pump Hose - with clamps
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:568837
    Part#: 020414ECS01KT
    In Stock
    Sale - Save 25% $ 113.99

    This product was last offered at the strikethrough price on
    06-14-2026

    $ 85.49 USD
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    BMW M52 M54 Water Pipe
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:594294
    Part#: 11537502525
    In Stock
    Sale - Save 5% $ 55.99

    This product was last offered at the strikethrough price on
    08-31-2026

    $ 53.19 USD
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    BMW M52 M54 Water Pipe is an essential replacement part designed to ensure long-term reliability and optimal performance for your BMW's cooling system. Engineered to replace cracked or broken coolant pipes, this high-quality water pipe from Turner Motorsport guarantees a perfect fit and dependable service. Investing in this replacement pipe helps prevent overheating and potential engine damage, maintaining your vehicle's performance and longevity.

    • Reliable replacement: Designed to replace cracked or broken coolant pipes for improved engine cooling.
    • Optimal fitment: Engineered to ensure a perfect fit and seamless installation.
    • Durable construction: Built with high-quality materials to withstand engine temperatures and environmental conditions.
    • Preventative maintenance: Helps avoid overheating and potential engine damage by ensuring a reliable coolant flow.
    • Vehicle compatibility: Specifically designed for BMW M52 and M54 engine models.

    Upgrade your BMW’s cooling system with the BMW M52 M54 Water Pipe from Turner Motorsport for enhanced reliability and performance.

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    Heater Inlet Pipe
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:594330
    Part#: 11531705210
    In Stock
    Sale - Save 5% $ 42.39

    This product was last offered at the strikethrough price on
    08-31-2026

    $ 40.27 USD
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    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.
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    Race German - Corporate Logo
    T#:6827887
    Part#: RGCTSAM12
    Ships in 1-2 days
    $ 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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    E46 M3, Z4M ECS Tuning Aluminum Water Pump Pulley
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:367060
    Part#: 002778ECS01
    Ships on Dec 18, 2026
    Sale - Save 10% $ 100.99

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    06-13-2026

    $ 90.89 USD
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    Most of the pulleys on your BMW engine are plastic, which become brittle and frail over time and from engine bay heat. A failed pulley could leave you stranded which is why it is vital to inspect the pulleys during routine maintenance. This is an aluminum version of the stock water pump pulley used on the S54 engine in the E46 M3, MZ3, and Z4M. It's the same size and uses the same hardware and the original belt as the stock plastic pulley. But the aluminum will last much longer.
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    ECS - Corporate Logo
    T#:599848
    Part#: 004481LA01
    In Stock
    Sale - Save 15% $ 113.99

    This product was last offered at the strikethrough price on
    06-14-2026

    $ 96.89 USD
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    The perfect upgrade for your connection between your thermostat and cylinder head. Designed using durable silicone and billet aluminum to greatly outlast the OE rubber and plastic combination. Some of the weakest points of the cooling systems in BMW's can come down to the OE plastic fittings breaking down from the constant changes in temperature, softening these plastic components. When this happens, even simply moving the hose slightly could cause the fitting to crack, causing the coolant to leak all over. The ECS design silicone hose with billet aluminum adapter retains OE fitment with superior strength to not only handle the performance, but also stand up to the wear and tear of a daily driver. Features: Manufactured from billet 6061-T6 and type III anodized for exceptional durability and corrosion resistance. Much stronger part than OEM plastic Will not become brittle and fatigue over time due to thermal cycling. This will prevent the part from breaking during removal and re-installation. Constructed of 4-Ply reinforced silicone for improved durability over the failure-prone OE rubber hose. Flourosilicone lined internal layer for exceptional chemical resistance. Silicone offers reduced thermal conductivity as well as improved resistance to ozone and UV degradation for improved performance and durability. Follows OEM form for perfect fitment. Utilizes OEM O-ring 11537545278 to ensure a proper seal. Replaces Genuine BMW Part Number: 11537545890
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    Wahler - Corporate Logo
    T#:360363
    Part#: 11537549476
    In Stock
    Sale - Save 7% $ 97.91

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    03-25-2026

    $ 91.43 USD
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    Sale - Save 7%
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    This product was last offered at the strikethrough price on
    03-25-2026

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    If your vehicle is experiencing cooling issues, chances are the thermostat is the cause. Common symptoms include a prolonged warm-up at highway speeds from the thermostat being stuck open, or consistent overheating issues from the thermostat being stuck in the closed position. Either condition can result in poor performance and potential damage to vital components in your vehicle.
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    Race German - Corporate Logo
    T#:6827888
    Part#: RGCTSA1/8NPT
    In Stock
    $ 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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    70-78mm - T-Bolt Hose Clamp - Priced each
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:380416
    Part#: 003402ECS07A-03
    In Stock
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    $ 23.99 USD
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    Ensure a tight and leak-free seal in your BMW's cooling, vacuum, or intake systems by installing a new adjustable hose clamp. Over time, clamps can deform or lose their tightness due to aging or frequent removal, potentially causing leaks in your coolant or vacuum hoses. Avoid the risk of leaks by replacing old clamps with new hardware, offering peace of mind against coolant and vacuum system issues.

    Key benefits of the adjustable hose clamp include:

    • Maintaining a secure and leak-free seal in your BMW's systems.
    • Preventing coolant or vacuum leaks that can affect performance.
    • Adjustable size from 70mm to 78mm for versatile applications.

    Upgrade your hose clamps to ensure optimal performance and reliability in your BMW's systems.

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    ECS Silicone Radiator Hoses - N52
    For SULEV Vehicles with Engine Code N51B30 & Auxiliary Heating (S536A)
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:32516370
    Part#: 008641LA02
    In Stock
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    $ 104.79 USD
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    Tired of dealing with brittle, dry-rotted rubber hoses? Whether you're refreshing your cooling system or replacing aging components, this ECS Silicone Radiator Coolant Hose Set is the ultimate upgrade. Designed for durability, performance, and a factory-perfect fit, these premium silicone hoses outperform standard rubber in every way.

    Why Choose Silicone Over Rubber?

    Made from heavy-duty, reinforced 4-ply fluorosilicone, ECS hoses withstand extreme temperatures and pressures far beyond OEM rubber hoses. Engineered to resist oil, fuel, and electrochemical degradation, these hoses are tested for continuous operation at 250°F and over 45 psi, delivering superior reliability, reduced turbulence, and improved coolant flow.

    Key Benefits:

    Direct OE Fitment – Perfectly molded to factory specifications for seamless installation. Enhanced Durability – Heat-resistant silicone prevents cracking, swelling, and deterioration over time. Superior Cooling Performance – Smoother internal passageways improve coolant flow and system efficiency. Pre-Installed Quick-Connect Fittings – Hassle-free installation with OEM-style connectors. Premium Hardware Included – Comes with German-style stainless steel worm-drive hose clamps for a secure fit. Kit Includes:

    Upper Radiator Hose Lower Radiator Hose Pre-Installed Factory "Quick-Connect" Flanges (4) Stainless Steel Worm-Drive Hose Clamps (4) Replaces OEM Part Numbers: 17127531579 & 17127564478

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    Wahler - Corporate Logo
    T#:374361
    Part#: N524TSTKT1
    In Stock
    $ 112.99

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    $ 111.99 USD
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    ECS High-Flow Water Pump Upgrade - E9X E8X N52
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:49822518
    Part#: 044952LA04KT
    In Stock
    Sale - Save 25% $ 477.99

    This product was last offered at the strikethrough price on
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    $ 358.49 USD
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    The N5X family of engines marked the start of a new era for BMW. The all-new aluminum block powerplants featured a host of technical upgrades, aiding in power output, reliability, and performance. Among these technological advances is an external electronic water pump, which removed load from the engine's accessory drive and allowed for advanced pulse-width-modulated (PWM) control.

    From factory, the N52's electronic water pump is limited to a measly 200W output—strong enough for daily driving, but lacking in performance applications. Recognizing this shortcoming, ECS engineers set out to create a high-flow water pump upgrade that doesn't break the bank. Their high-quality adapter wiring harness and bracket allow you to install a 400W N54 water pump without any modification, an effortless, yet effective upgrade that doubles the output of the factory water pump!

    By increasing coolant flow capacity, the 400W pump improves heat extraction from the cylinder head and engine block during high-load operation. This added thermal headroom is particularly beneficial for modified engines, sustained aggressive driving, track use, or operation in elevated ambient temperatures where the factory pump can operate near its limits. Improved circulation helps maintain more stable coolant temperatures and reduces the risk of localized hot spots.

    Features & Benefits:

    Upgrades to the more powerful 400W N54 water pump for increased coolant flow and improved engine cooling efficiency Sealed adaptor harness ensures secure connections and optimal operation under demanding conditions The N54 pump's higher power output offers longer-lasting, more effective cooling compared to the stock N52 pump Design:

    40A fused power wire safely handles the increased power demands of the N54 pump, providing consistent and stable performance Sealed and robust construction, designed to withstand heat and moisture, ensuring reliability in even the most challenging environments Plug-and-play compatibility is designed for easy integration with the N52 engine and N54 water pump, minimizing installation time and complexity Kit Contents:

    ECS N54 Water Pump Adapter Kit Conversion wiring harness Aluminum bracket Installation hardware Bavarian Autosport Water Pump (11517632426)

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    Rein Radiator Hose - Lower - Z4
    For roadster models with production date up to 04/2004
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:402423
    Part#: 17127514405
    In Stock
    Sale - Save 5% $ 29.99

    This product was last offered at the strikethrough price on
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    $ 28.49 USD
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    Keep your cooling system leak free

    OEM Rein Upper Radiator Hose - Z4 Roadster
    Roadster models only
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:362445
    Part#: 17127514404
    Ships in 1 Business Day
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    08-31-2026

    $ 49.39 USD
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    Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

    Thermostat With Housing
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:582356
    Part#: 11537509227
    Ships in 3 Business Days
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    $ 85.49 USD
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    Stop leaks before they start with this new Thermostat With Housing from Rein.
    Rein Expansion Tank Mounting Plate - E46, Z4
    For vehicles with automatic transmission only
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:402139
    Part#: 17111436251
    Ships in 1 Business Day
    Sale - Save 5% $ 80.99

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    08-31-2026

    $ 76.94 USD
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    Mounts to the side of the radiator for retaining the expansion tank
    3/8"/9mm Band Hose Clamp - 50-70mm
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:341684
    Part#: 003402ECS06A-12
    In Stock
    Sale - Save 25% $ 6.99

    This product was last offered at the strikethrough price on
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    $ 5.24 USD
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    Elevate your BMW maintenance with ECS Tuning's 304 stainless steel hose clamps, offering convenience and top-quality performance at an affordable price. Designed with various band widths and German-style T-bolts for adjustable sizing, these hose clamps ensure a secure fit for your specific diameter needs. Skip the dealership wait and excessive pricing; ECS Tuning provides reliable, dealership-quality hose clamps without the premium cost, ensuring your car receives the care it deserves.
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    Rein Coolant Bleeder Screw CHW1575 - Priced Each
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:591955
    Part#: 17111712788
    In Stock
    Sale - Save 22% $ 4.99

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    $ 3.87 USD
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    $ 4.99

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    Coolant Bleeder Screw is a critical component for maintaining your BMW’s cooling system. Designed to release trapped air from the coolant lines, this screw ensures efficient coolant flow and prevents overheating. Specifically engineered for BMW models, it enhances the overall performance and longevity of your engine by maintaining proper temperature regulation. Comes with O-Ring.
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    40-60mm 3/8"/9mm Band Hose Clamp
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:341280
    Part#: 003402ECS06A-08
    In Stock
    Sale - Save 25% $ 3.99

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

    $ 2.99 USD
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    ECS Tuning 304 Stainless Steel Hose Clamps

    Revolutionize your car maintenance with ECS Tuning's premium 304 stainless steel hose clamps. Eliminate dealership delays and inflated prices! These German-style clamps utilize T-bolts for hassle-free diameter adjustment. With various band widths available, these durable clamps ensure reliability without the hefty cost. Experience dealership-quality products at affordable rates, exclusively at ECS Tuning.

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    60-80mm 1/2"/12mm Band Hose Clamp
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:377836
    Part#: 003402ECS05A-10
    In Stock
    Sale - Save 25% $ 6.99

    This product was last offered at the strikethrough price on
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    $ 5.24 USD
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    ECS Tuning Stainless Steel Hose Clamps for BMW

    Upgrade your BMW's hose clamps with ECS Tuning Stainless Steel Hose Clamps, designed for convenience and durability. Say goodbye to long waits and overpriced dealership clamps. With various band widths available, these stainless steel clamps ensure a secure fit for your vehicle's hoses.

    Benefits:

    • Convenient replacement for worn-out hose clamps
    • Made of durable stainless steel for long-lasting performance
    • Available in various band widths for versatile use
    • Affordable alternative to dealership pricing
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    Band Hose Clamp | 12-20mm 3/8"/9mm
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:304266
    Part#: 003402ECS06A-03
    In Stock
    Sale - Save 25% $ 4.99

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

    $ 3.74 USD
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    Secure hoses in your BMW effortlessly with the ECS 3/8" / 9mm Band Hose Clamp (12-20mm). Specifically designed for BMW models, this clamp ensures a snug fit and reliable hold for hoses measuring between 12mm to 20mm. Crafted with durable materials, these clamps provide exceptional resistance against leaks and are ideal for various automotive applications. Upgrade your BMW's hose security with these reliable ECS hose clamps.
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    Aluminum Screws for N52 N54 Water Pump
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:2253
    Part#: 11510392553
    In Stock
    Sale - Save 5% $ 7.13

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    08-31-2026

    $ 6.77 USD
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    These aluminum water pump screws are single use and must be replaced each time they are removed. These are used on all 325i, 328i, and 330i with the BMW N51 N52 and N53 engines. They were also used on some early N54 engines that have rubber mounts on the water pump housing. Do not use these bolts if your N54 water pump has been replaced with a housing that does not have the rubber mounts.

    In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the world’s finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.

    This item fits the following BMWs:
    2008+ E82 BMW 128i 135i
    2007+ E9X BMW 325i 325xi 328i 328xi 330i 335i 335xi
    2006+ E60 BMW 525i 525xi 528i 528xi 530i 530xi 535i 535xi
    2006+ X3 BMW X3 3.0i X3 3.0si
    2006+ Z4 BMW Z4 3.0i Z4 3.0si
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    Rein - Corporate Logo
    T#:348982
    Part#: 11537521049
    In Stock
    Sale - Save 5% $ 17.99

    This product was last offered at the strikethrough price on
    08-31-2026

    $ 17.09 USD
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    Connects from the water pump to the thermostat

    1/2"/12mm Band Hose Clamp - 25-40mm - Priced Each
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:385425
    Part#: 003402ECS05A-06
    In Stock
    Sale - Save 25% $ 4.99

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

    $ 3.74 USD
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    $ 4.99

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    Upgrade Your BMW Maintenance with Stainless Steel Hose Clamps from ECS Tuning

    ECS Tuning introduces premium full stainless steel hose clamps, offering superior quality and convenience for your BMW maintenance. Avoid dealership delays and overpricing by choosing from a selection of band widths, ensuring you receive top-quality hose clamps without overpaying.

    Key Benefits:

    • Premium full stainless steel hose clamps
    • Various band widths for enhanced convenience
    • High-quality alternative to dealership pricing
    • Readily available stock eliminates waiting time
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    Rein - Corporate Logo
    T#:340541
    Part#: 17111742231
    Ships in 1 Business Day
    Sale - Save 5% $ 17.99

    This product was last offered at the strikethrough price on
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    $ 17.09 USD
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    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.
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    70-90mm 3/8"/9mm Band Hose Clamp
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:363017
    Part#: 003402ECS06A-11
    In Stock
    Sale - Save 25% $ 6.99

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

    $ 5.24 USD
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    Upgrade your BMW with ECS Tuning's Stainless Steel Hose Clamps, designed for convenience and durability. With various band widths and German-style T-bolts, these clamps offer easy adjustment to your required diameter. Say goodbye to dealer pricing and enjoy the quality you love at ECS Tuning.

    • Full stainless steel construction
    • Various band widths available
    • German-style T-bolts for easy adjustment
    • Convenient solution for hose clamp replacement
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    Wahler - Corporate Logo
    T#:362366
    Part#: 11531318402
    In Stock
    $ 6.17 USD
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    BMW does not include a o-ring with their new thermostats
    ECS - Corporate Logo
    T#:49822519
    Part#: 044952LA04AKT
    In Stock
    $ 597.99 USD
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    $ 597.99 USD
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    The N5X family of engines marked the start of a new era for BMW. The all-new aluminum block powerplants featured a host of technical upgrades, aiding in power output, reliability, and performance. Among these technological advances is an external electronic water pump, which removed load from the engine's accessory drive and allowed for advanced pulse-width-modulated (PWM) control.

    From factory, the N52's electronic water pump is limited to a measly 200W output—strong enough for daily driving, but lacking in performance applications. Recognizing this shortcoming, ECS engineers set out to create a high-flow water pump upgrade that doesn't break the bank. Their high-quality adapter wiring harness and bracket allow you to install a 400W N54 water pump without any modification, an effortless, yet effective upgrade that doubles the output of the factory water pump!

    By increasing coolant flow capacity, the 400W pump improves heat extraction from the cylinder head and engine block during high-load operation. This added thermal headroom is particularly beneficial for modified engines, sustained aggressive driving, track use, or operation in elevated ambient temperatures where the factory pump can operate near its limits. Improved circulation helps maintain more stable coolant temperatures and reduces the risk of localized hot spots.

    Features & Benefits:

    Upgrades to the more powerful 400W N54 water pump for increased coolant flow and improved engine cooling efficiency Sealed adaptor harness ensures secure connections and optimal operation under demanding conditions The N54 pump's higher power output offers longer-lasting, more effective cooling compared to the stock N52 pump Design:

    40A fused power wire safely handles the increased power demands of the N54 pump, providing consistent and stable performance Sealed and robust construction, designed to withstand heat and moisture, ensuring reliability in even the most challenging environments Plug-and-play compatibility is designed for easy integration with the N52 engine and N54 water pump, minimizing installation time and complexity Kit Contents:

    ECS N54 Water Pump Adapter Kit Conversion wiring harness Aluminum bracket Installation hardware Pierburg Full Aluminum Water Pump (11515A05704) Installation:

    - Click HERE for Installation Instructions -

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    90-110mm 3/8"/9mm Band Hose Clamp
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:341281
    Part#: 003402ECS06A-13
    In Stock
    Sale - Save 40% $ 6.99

    This product was last offered at the strikethrough price on
    05-02-2026

    $ 4.19 USD
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    ECS Tuning 304 Stainless Steel Hose Clamps

    Once again, ECS Tuning has found a way to make life easier for working on your car. Need new hose clamps but don't want to wait to order it from the dealership or pay more than you should for a hose clamp? That's where we come in! These are full 304 stainless steel hose clamps with various band widths for your convenience. They are German style using T-bolts to adjust in size to your required diameter. Never pay dealer pricing again, but still get the quality you love here at ECS Tuning.

    • Made from high-quality 304 stainless steel for durability
    • German-style design with T-bolts allows for easy size adjustment
    • Various band widths for versatile use
    • Avoid dealership pricing without compromising on quality
    • Perfect for BMW enthusiasts seeking affordable yet reliable hose clamps
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    OEM Rein Coolant Pipe Inlet Hose Section - N52
    2X Entries Into Our F80 M3 Sweepstakes
    Rein - Corporate Logo
    T#:388662
    Part#: 11537516414
    In Stock
    Sale - Save 5% $ 19.99

    This product was last offered at the strikethrough price on
    08-31-2026

    $ 18.99 USD
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    Cooling hoses tend to crack over time after going through countless heating and cooling cycles. This can lead to leaks or air bubbles in the cooling system that lead too coolant loos, hurts cooling potential, or could possibly cause damage from excess heat.

    Fits the following BMWs:
    Submodels with N52 3.0L engine.

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    77-85mm - 3/4" Band Hose Clamp
    10X Entries Into Our F80 M3 Sweepstakes
    ECS - Corporate Logo
    T#:377877
    Part#: 003402ECS07A-05
    In Stock
    Sale - Save 25% $ 25.99

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

    $ 19.49 USD
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    $ 25.99

    This product was last offered at the strikethrough price on
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    Upgrade your BMW's hose clamps with the 77-85mm - 3/4" Band Hose Clamp from Turner Motorsport. These full 304 stainless steel clamps offer convenience and quality without the dealership price tag. German-style T-bolts allow for easy adjustment to your required diameter, ensuring a secure fit every time.

    • Made of durable 304 stainless steel for long-lasting performance
    • German-style T-bolt design for easy size adjustment
    • Convenient band widths for versatile applications
    • Quality alternative to dealership pricing
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