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BMW Cooling System Parts & Accessories for BMW X5 M S63 4.4L

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

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Thermostat Replacement kit - 90C

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:15744051

Part#: 82142209769KT

In Stock

Sale - Save 3% $ 146.99

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

$ 142.66 USD

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Sale - Save 3%

$ 146.99

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

$ 142.66 USD

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Water Pump And Thermostat Kit - E70 E71 F01 F02 F06 F07 F10 F12 F13 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:554065

Part#: 11517548263KT3

Ships in 4 Business Days

Sale - Save 20% $ 336.99

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

$ 269.01 USD

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Sale - Save 20%

$ 336.99

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

$ 269.01 USD

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The water pumps in BMW's should be serviced near 80,000 miles and may become an 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:

Thermostat
Water pump
Coolant

This item fits the following BMW Engines:
N63,N63N,S63,N62N

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Performance Water Pump & Thermostat Kit - 90*C - S63

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:30397428

Part#: 11537843738KT2

Ships on Nov 17, 2026

$ 579.99

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

$ 547.99 USD

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$ 547.99 USD

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The water pump is a known weak point across all BMW models, requiring servicing every 60,000 miles. Along with the water pump, it’s wise to replace the thermostat to ensure your cooling system operates at peak efficiency.

This kit features a 90°C (194°F) thermostat from Hamburg Technic, which opens approximately 15°C earlier than the standard factory thermostat. This lower temperature is particularly advantageous for performance-focused applications.

What's Included:

Genuine BMW Mechanical Water Pump Assembly (11537843738) Hamburg Technic Performance Thermostat - 90°C/194°F (11537586885) Genuine BMW Coolant/Antifreeze - Diluted, 1 Gallon (82141467704) Benefits of a Lower Thermostat Temperature:

Enhanced Engine Cooling: Opens sooner to reduce engine temperature more effectively. Improved Performance: Keeps engine components cooler, allowing for better performance in high-stress conditions. Extended Engine Life: Reduces thermal stress on engine parts, promoting longevity. Prevents Overheating: Helps to avoid overheating in demanding driving scenarios. Optimized Fuel Efficiency: Maintains ideal engine temperature for efficient fuel combustion. Elevate your BMW's cooling system and performance with this expertly curated kit from Turner Motorsport.

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Bav Auto Coolant Expansion Tank - With Level Sensor - E70 X5, E71 X6 ...

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:638093

Part#: 17138621092

In Stock

Sale - Save 20% $ 60.99

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

$ 48.79 USD

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Sale - Save 20%

$ 60.99

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

$ 48.79 USD

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Replace your old expansion tank to prevent potential failure or leaks. Includes a brand new coolant level sensor.

Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:639833

Part#: 13621433076

In Stock

Sale - Save 20% $ 14.99

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

$ 11.99 USD

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Sale - Save 20%

$ 14.99

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

$ 11.99 USD

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This is the coolant temperature sensor used in many BMW models from the late-1990s to the mid-2010s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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BMW Cooling System Parts & Accessories for BMW X5 M S63 4.4L

Sub-Categories

Thermostat Replacement kit - 90C

Water Pump And Thermostat Kit - E70 E71 F01 F02 F06 F07 F10 F12 F13 ...

Performance Water Pump & Thermostat Kit - 90*C - S63

Bav Auto Coolant Expansion Tank - With Level Sensor - E70 X5, E71 X6 ...

Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02

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