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BMW Cooling System Parts & Accessories

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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Burger Motorsports - Corporate Logo
T#:38621407
Part#: BMS-TCBS
Back Ordered
$ 25.00 USD
Free Shipping on orders $49 and up
Replace your fragile OEM plastic coolant bleeder screw, which is prone to cracking and failure, with a premium titanium upgrade built for strength and style under the hood. Factory plastic components weaken over time due to constant heat cycles, leading to brittleness and potential failure. Our titanium replacement delivers superior durability, being twice as strong as aluminum yet 45% lighter than steel, ensuring unmatched resilience and long-term reliability for your coolant system. More than an upgrade, it’s a must-have for engine longevity. CNC-machined from solid titanium, each screw features a laser-etched Burger Motorsports logo and is hand-burned to create unique color patterns—no two are alike. A heavy-duty replacement O-ring is included for a perfect fit.
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Advanced Auto Fabrication - Corporate Logo
T#:7624632
Part#: 116211.2
Ships in 2 Business Days
$ 85.00 USD
Free Shipping
$ 85.00 USD
Free Shipping

BMW E46 M54 AAF Low Temp Thermostat Kit - Partial is an essential upgrade for enthusiasts looking to optimize engine performance and reliability. Developed by Advanced Auto Fabrication (AAF), this kit addresses the limitations of the factory M54 thermostat, which maintains a temperature range of 80-103°C and opens the mechanical failsafe at 110°C. For race conditions where maintaining a lower temperature is crucial, this kit replaces the stock electronic thermostat with a manual unit, allowing the engine to run at a safer and more efficient temperature. This upgrade not only enhances engine longevity but also reduces stress from high-temperature operation, minimizes heat soak, and increases power.

  • Optimal Temperature Control: Replaces the factory thermostat for improved engine temperature management.
  • Enhanced Engine Longevity: Operates at safer temperatures, reducing stress and extending engine life.
  • Increased Power: Lower operating temperatures can lead to better engine performance.
  • Reduced Heat Soak: Helps prevent overheating and ensures efficient cooling.
  • Improved Reliability: Manual thermostat unit offers more consistent performance in racing conditions.

Partial Kit Contents:

  • Thermostat housing plate
  • Thermostat
  • Installation hardware
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AAF Transmission Crossmembers 5-Speed - E46 Non-M
Fits ZF and Getrag Transmissions. Non-M models Only
Advanced Auto Fabrication - Corporate Logo
T#:7608860
Part#: 116110
In Stock at Vendor
$ 190.00 USD
Free Shipping
$ 190.00 USD
Free Shipping
Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. Ideal for the SE46 racing series, the AAF E46 5-speed Transmission Crossmember is a heavy-duty and worthwhile upgrade. The OEM thin cast aluminum cross member has been known to fail in multiple different ways. When using stiff engine and transmission mounts, the cross member can crack out and break around these mounting points. The cross member can also break from the high amounts of load transferred through the drive train. While chassis flex from hard cornering is being applied through the engine and transmission from the front cross member, this load is sent from the transmission back into the chassis at the transmission cross member. This is simply too much stress for the OEM cross member to hold up to under the extreme punishment of road racing. The AAF E46 Transmission Cross Member is completely constructed of 1/4' thick heavy-duty aluminum plate. It is designed specifically to cope with hours of endurance racing.
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Advanced Auto Fabrication - Corporate Logo
T#:7624630
Part#: 116211
In Stock at Vendor
$ 175.00 USD
Free Shipping
$ 175.00 USD
Free Shipping
Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. The factory M54 thermostat is electronically controlled to keep the engine running between 80-103°C, whereas race cars like to maintain 80°C or less for maximum power. Additionally, the mechanical failsafe doesn’t open up until the coolant temperature reaches 110°C, or 230°F, which is about the point when most race cars are turned off and parked which is no good for the motor! The AAF E46 M54 Low Temp Thermostat Kit is designed to give the control of proper engine operating temperature back by replacing the stock electronic thermostat with a manual unit. This allows the engine to run at the proper, and much safer, operating temperature, improving engine longevity, reduces stress from high-temp. operation, reduces heat soak, and increases power! Full Kit Contents: Thermostat housing Thermostat housing plate Thermostat install hardware sealant
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Advanced Auto Fabrication - Corporate Logo
T#:7608839
Part#: 11641
In Stock at Vendor
$ 189.00 USD
Free Shipping on orders $49 and up

BMW E46 AAF Aluminum Radiator Mounting Kit provides a robust solution for mounting an aluminum radiator into the BMW E46 chassis without relying on the stock plastic mounts. Developed by Advanced Auto Fabrication, a company renowned for their expertise in producing high-performance race car components, this kit reflects their extensive knowledge and dedication to BMW race car design.

The mounting kit is designed to replace the stock mounting system and is compatible with lightweight aftermarket fans, as the stock electric fan cannot be used. Please note that this kit does not fit M3 models.

  • Durable Construction: Made from high-quality aluminum for strength and longevity.
  • Enhanced Cooling Efficiency: Allows for the use of aftermarket fans for improved cooling performance.
  • Race-Ready Design: Reflects Advanced Auto Fabrication's expertise in BMW race car components.
  • No Stock Plastic Mounts: Provides a more reliable and robust mounting solution than the factory system.
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Spec-D Tuning - Corporate Logo
T#:20946747
Part#: RAD3Z398
Ships in 3 Business Days
$ 152.99 USD
$ 152.99 USD
1 piece of 2-row radiator Made of lightweight & long-lasting aluminum material Overall dimension: 24.5" (L) x 2.75" (W) x 18.5" (H) Inlet: 1.5"/ Outlet: 1.5" Provides maximum cooling efficiency

Canton Racing - Corporate Logo
T#:19428667
Part#: 80-272
In Stock
$ 185.00 USD
Free Shipping on orders $49 and up
Upgrade your Gen1 Mini Cooper & Cooper S with this high-quality coolant expansion/fill tank from Canton Racing. With a billet radiator-style neck designed to accept the Canton Racing part #81-030 pressure cap or any 30 psi radiator-style cap, this aluminum tank offers superior performance and style.
  • Features a billet radiator-style neck for enhanced durability
  • Resolves expansion tank issues with a solid, built-in mount
  • Eliminates worries about separating and leaking plastic tanks
  • Perfectly complements Canton Racing 77-272 MINI power steering tank
Ensure reliability and improve the aesthetic appeal of your engine bay with this Canton Racing Aluminum coolant expansion/fill tank for your Gen1 Mini Cooper & Cooper S.
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AAF E46 Transmission Crossmembers - 6-Speed Non-M
For use with solid front engine mounts only!
Advanced Auto Fabrication - Corporate Logo
T#:7624639
Part#: 116222
In Stock
$ 190.00 USD
Free Shipping
$ 190.00 USD
Free Shipping
Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. Ideal for the SE46 racing series, the AAF E46 6-speed Transmission Crossmember is a heavy-duty and worthwhile upgrade. The OEM thin cast aluminum cross member has been known to fail in multiple different ways. When using stiff engine and transmission mounts, the cross member can crack out and break around these mounting points. The cross member can also break from the high amounts of load transferred through the drive train. While chassis flex from hard cornering is being applied through the engine and transmission from the front cross member, this load is sent from the transmission back into the chassis at the transmission cross member. This is simply too much stress for the OEM cross member to hold up to under the extreme punishment of road racing. The AAF E46 Transmission Cross Member is completely constructed of 1/4' thick heavy-duty aluminum plate. It is designed specifically to cope with hours of endurance racing.
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Behr - Corporate Logo
T#:1196128
Part#: 17111723784
In Stock at Vendor
$ 298.35

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

$ 275.96 USD
$ 275.96 USD
Brand new radiator equivalent to OE

Canton Racing - Corporate Logo
T#:19428666
Part#: 81-030
In Stock
$ 38.00 USD
Free Shipping on orders $49 and up
Ensure optimal performance of your Mini's cooling system with the Expansion Tank Pressure Cap - 30 Lbs W10 W11 1.6L Engine. Designed for use with Canton Racing aluminum expansion tanks or similar applications, this 30psi radiator style cap provides reliable pressure control. Keep your engine running smoothly with this essential component.
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Behr - Corporate Logo
T#:591360
Part#: 17111728905
In Stock at Vendor
$ 399.99

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

$ 388.99 USD
Free Shipping on orders $49 and up
$ 388.99 USD
Free Shipping on orders $49 and up
Behr Replacement Radiator - More than likely, you are going to replace the radiator in your vehicle at least once. The joints where the cores meet the end tanks tend to get weak and are the first place to spring a leak. Impacts to the fins themselves can cause holes to form. Corrosion and clogging from the inside can make cooling less than effective and compromise coolant flow.
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Behr - Corporate Logo
T#:363371
Part#: 17111737760
In Stock at Vendor
$ 687.60 USD
$ 687.60 USD
Replace your leaking radiator


Advanced Auto Fabrication - Corporate Logo
T#:7624640
Part#: 116223
Ships in 4 Business Days
$ 190.00 USD
Free Shipping
$ 190.00 USD
Free Shipping
Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. Ideal for the SE46 racing series, the AAF E46 6-speed Transmission Crossmember is a heavy-duty and worthwhile upgrade. The OEM thin cast aluminum cross member has been known to fail in multiple different ways. When using stiff engine and transmission mounts, the cross member can crack out and break around these mounting points. The cross member can also break from the high amounts of load transferred through the drive train. While chassis flex from hard cornering is being applied through the engine and transmission from the front cross member, this load is sent from the transmission back into the chassis at the transmission cross member. This is simply too much stress for the OEM cross member to hold up to under the extreme punishment of road racing. The AAF E46 Transmission Cross Member is completely constructed of 1/4' thick heavy-duty aluminum plate. It is designed specifically to cope with hours of endurance racing.
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Advanced Auto Fabrication - Corporate Logo
T#:7624641
Part#: 116251
In Stock at Vendor
$ 140.00 USD
$ 140.00 USD
Since 2010, Advanced Auto Fabrication has been producing and developing both parts and full fledged race cars. Their knowledge base covers a wide range of vehicles both domestic and imported. In the specific case of BMW, the team at AAF has a particular affinity for building and designing components for BMW race cars. AAF has created a light-weight fan shroud for your E46 race car. Equipped with 7 flaps to let as much air through as possible at speed and fits a 14' fan. Seamlessly attaches to the AAF Radiator Mounts. The shroud creates a vacuum to expand the fan’s ability to pull from the entire surface area of the radiator. This creates cooler temps under the hood with the benefit of 7 flaps that allow the most air to pass through. **AAF states fitment has only been thoroughly tested with their radiator mounts. No fitment info for the stock plastic mounts is available at this time. AAF has created a light-weight fan shroud for your E46 race car. Equipped with 7 flaps to let as much air through as possible at speed and fits a 14' fan. Seamlessly attaches to the AAF Radiator Mounts. The shroud creates a vacuum to expand the fan’s ability to pull from the entire surface area of the radiator. This creates cooler temps under the hood with the benefit of 7 flaps that allow the most air to pass through. **AAF states fitment has only been thoroughly tested with their radiator mounts. No fitment info for the stock plastic mounts is available at this time. *Does not include fan.
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Spec-D Tuning - Corporate Logo
T#:14684348
Part#: RAD3-Z398
Ships in 8 Business Days
$ 152.99 USD
$ 152.99 USD
Brand new in original box 1 piece of 2-row radiator Made of lightweight & long-lasting aluminum material Overall dimension: 24.5" (L) x 2.75" (W) x 18.5" (H) Inlet: 1.5"/ Outlet: 1.5" Provides maximum cooling efficiency Professional installation is recommended
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Genuine BMW Motorsport - Corporate Logo
T#:1171
Part#: TMS1171
Ships in 9 Business Days
$ 415.45 USD
Free Shipping
$ 415.45 USD
Free Shipping
This is a genuine BMW Motorsport part, designed specifically for BMW racing applications. We use this exact thermostat setup in our Championship-winning E46 330i race car. It is designed to be used on all M54 and M52TU double-VAN0S engines, as used in the 1999-2000 E46 323/328 and 2001-2005 E46 325/330. This 60 degree C (140 defrees F) thermostat comes complete with plastic thermostat housing. It does not use the plug and wiring for the stock DME so this should only be used with an aftermarket engine management system (Motec, Bosch, etc).

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.
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Rogue Engineering - Corporate Logo
T#:13694122
Part#: RADE9X-M3-ONLY
Ships in 10 Business Days
$ 79.00 USD
Free Shipping on orders $49 and up
Benefits of Rogue Engineering Silicone Radiator Hoses More resistant to high temperatures, solvents and oil, when compared to OEM rubber hoses. Temperature ranges from -149° F to 500° F, much larger range than OEM (typical range for OEM is -40o F to +275o F) Our hoses can handle more pressure, with a maximum pressure of 350psi. Our silicone hoses stay flexible, whereas rubber can harden and crack over time. Available only in BLACK color, with discrete RE logo. All Rogue Engineering Silicone Radiator Hose kits come complete with new, replacement hose clamps as the factory ones are not suitable for reuse after long years of service. Application Notes The E9X M3 kit replaces 11537838214 and 11537840661 and fits the following: 2008-2013 E9X M3 (US and Euro) Notes: The E9X M3 hose kit requires the use of OEM connectors from the original hoses.
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Genuine BMW Motorsport - Corporate Logo
T#:5574
Part#: 11518331044
Special Order: No Guaranteed ETA
$ 999.99 USD
Free Shipping
$ 999.99 USD
Free Shipping
Upgrade from the plastic impeller on the stock water pump to this aluminum impeller pump originally developed by BMW for the M3 GT4. This aluminum water pump was designed to stand up to the abuse of racing but can be used on a standard street car.
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Behr - Corporate Logo
T#:579569
Part#: 376755591
Back Ordered
$ 267.99 USD
$ 267.99 USD
Replace your leaking radiator
Genuine BMW Motorsport - Corporate Logo
T#:337991
Part#: 11531417215
Back Ordered
Starting at $ 232.98 USD
Free Shipping
Starting at $ 232.98 USD
Free Shipping
E46M3 Motorsport Thermostat 55C (Also fits Euro E36 M3 engine) A Genuine BMW part this thermostat opens at a much lower temperature than stock to keep your S54 engine (or Euro S50/S52 engine) running cooler in race applications.
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Behr - Corporate Logo
T#:33047035
Part#: 17117634565
In Stock at Vendor
$ 156.99

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

$ 140.99 USD
Free Shipping on orders $49 and up
$ 140.99 USD
Free Shipping on orders $49 and up

Behr - Corporate Logo
T#:338021
Part#: 17119071518
In Stock at Vendor
Starting at $ 249.99 USD
Starting at $ 249.99 USD
This is a BEHR brand (OEM supplier to BMW) replacement radiator for all 1999-2006 E46 3 series (non-M), including 323i, 323Ci, 328i, 328Ci, 325i, 325Ci, 330i, 330Ci, and Z4 2.5 and 3.0. Compare to BMW list price of $318! Save big, while still getting the highest quality radiator available for your BMW.

This radiator fits the follow BMWs: :
Only for Manual Transmission
1999-5/2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi - Not for cars with M56 engine

2003-2006 E85 BMW Z4 2.5i Z4 3.0i - M54 engine
2006-2008 E85 BMW Z4 M Roadster M Coupe
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Burger Motorsports - Corporate Logo
T#:5095728
Part#: GCHASB58HEATEXCH
Ships on Aug 7, 2026
$ 480.00 USD
Free Shipping on orders $49 and up
This heat exchanger upgrade is a high-quality replacement that dramatically lowers engine oil and water temperatures by providing a 50% larger cooling surface than OEM. The benefits are most noticed during back to back runs at higher boost levels where the factory cooling capacity can be overwhelmed resulting in ignition timing pull and reduced turbo efficiency. Direct bolt-in installation.
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Behr Radiator Replacement
For Automatic Vehicles only
Behr - Corporate Logo
T#:591355
Part#: 17117519211
In Stock at Vendor
$ 454.11 USD
$ 454.11 USD
Replace your faulty or worn radiator with this factory replacement


Behr - Corporate Logo
T#:594798
Part#: 17117576827
Ships in 1-2 days
$ 415.99 USD
Free Shipping on orders $49 and up
Replacement Radiator from Behr Hella
Behr - Corporate Logo
T#:594801
Part#: 17117570094
Ships on Aug 7, 2026
$ 374.99 USD
$ 374.99 USD
More than likely, you are going to replace the radiator in your vehicle at least once. The joints at where the cores meet the ends tend to get weak and are the first place to spring a leak. Impacts to the fins themselves can cause holes to form. Corrosion and clogging from the inside can make it less than effective. Replace your leaking unit with a factory replacement and get that jug of coolant out of your back seat.
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Behr - Corporate Logo
T#:594800
Part#: 17117605644
Ships on Aug 7, 2026
$ 362.99 USD
$ 362.99 USD
Replacement Radiator from Behr

Canton Racing - Corporate Logo
T#:19428688
Part#: 80-272BLK
Ships on Aug 12, 2026
$ 223.00 USD
Free Shipping on orders $49 and up

Upgrade your Gen1 Mini Cooper or Cooper S with the coolant expansion/fill tank featuring a billet radiator-style neck. This tank accepts the Canton Racing part #81-030 pressure cap or any 30 psi radiator-style cap. The Canton Racing Aluminum tank with Powdercoated Wrinkle Black finish not only enhances the engine bay aesthetics but also resolves expansion tank issues with its solid build and built-in mount. Say goodbye to concerns about separating and leaking plastic expansion tanks. Pair it with the Canton Racing 77-272 MINI power steering tank for a perfect combination.

  • Features a billet radiator-style neck
  • Accepts Canton Racing pressure cap or any 30 psi radiator-style cap
  • Enhances engine bay aesthetics with Powdercoated Wrinkle Black finish
  • Resolves expansion tank issues with solid build and built-in mount
  • Eliminates worries about separating and leaking plastic tanks
  • Perfect complement to Canton Racing 77-272 MINI power steering tank
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Canton Racing - Corporate Logo
T#:31390597
Part#: 80-272BLKKT
Ships on Aug 12, 2026
$ 261.00 USD
Free Shipping on orders $49 and up

MINI R50 to R53 Expansion Tank Aluminum Wrinkle Black & Cap - Kit offers the premium quality of Canton Racing for MINI enthusiasts. This high-grade aluminum expansion tank features a sleek Wrinkle Black powder-coated finish, designed to replace the original plastic tank with ease.

  • Premium Quality: Made from durable aluminum with a Wrinkle Black powder-coated finish for enhanced aesthetics and longevity.
  • Direct Replacement: Utilizes the original mountings for a hassle-free installation, ensuring a perfect fit.
  • Enhanced Functionality: Upgrades from the standard plastic tank to improve both appearance and performance over time.
  • Kit Includes:
    • Canton Racing Coolant Tank in Wrinkle Black Powdercoating
    • Canton Racing Stant Tank Cap
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Canton Racing - Corporate Logo
T#:31423679
Part#: 80-272BLKKT1KT
Ships on Aug 12, 2026
$ 479.00 USD
Free Shipping on orders $49 and up

MINI R50 to R53 Expansion Tank / Power Steering Tank - Wrinkle Black Aluminum is a high-quality solution designed to address both coolant expansion and power steering needs in one kit. This kit includes a billet-style expansion tank with a radiator neck that accepts the Canton Racing part #81-030 pressure cap or any 30 psi radiator cap, ensuring a secure and leak-proof seal.

Key benefits of the MINI R50 to R53 Expansion Tank / Power Steering Tank - Wrinkle Black Aluminum include:

  • Dual Functionality: Combines both expansion tank and power steering tank into a single, convenient kit.
  • Durable Construction: Made from aluminum with a wrinkle black finish, providing long-lasting performance and a sleek appearance.
  • Enhanced Sealing: Features a billet radiator-style neck that fits standard 30 psi radiator caps, preventing leaks and ensuring reliable operation.
  • Reliable Design: Eliminates the issues associated with plastic tanks, such as separation and leakage.
  • Complete Kit: Includes a black expansion tank, black power steering tank, and a Stant cap for easy installation.
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Behr - Corporate Logo
T#:1195792
Part#: 17111723467
Back Ordered
$ 273.99

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

$ 265.99 USD
$ 265.99 USD
OE replacement radiator