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Mahle 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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Mahle-Behr Thermostat - 79Âº C - E34, E39, E52

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T#:341209

Part#: 11537835558

Ships in 1-3 days

$ 74.00

This product was last offered at the strikethrough price on
05-21-2026

$ 69.87 USD

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$ 69.87 USD

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Includes sealing o-ring

Thermostat Housing W/ Thermostat Kit

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T#:567822

Part#: 11538674895

Ships in 1 Business Day

$ 179.89 USD

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$ 179.89 USD

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Thermostat With Housing

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T#:594783

Part#: 11537550172

In Stock at Vendor

$ 134.41 USD

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$ 134.41 USD

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Overheating your N52 or N54 engine can be detrimental to the longevity of your engine.

Thermostat With Housing

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T#:594781

Part#: 11537605431

In Stock at Vendor

$ 128.17 USD

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$ 128.17 USD

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If your vehicle is experiencing cooling issues, chances are the thermostat is the cause. Common symptoms include 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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Mahle-Behr Thermostat - 92C - E34, E36, E39

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T#:12476

Part#: 11537511083

Ships in 8 Business Days

$ 29.99

This product was last offered at the strikethrough price on
05-22-2026

$ 27.44 USD

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$ 27.44 USD

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OEM BMW THERMOSTAT:115040

Thermostat - 80°C

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T#:594727

Part#: 11531713040

Ships on Jun 19, 2026

$ 35.99 USD

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$ 35.99 USD

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The thermostat on your vehicle controls the flow of coolant based on temperature. When you just start your engine, the thermostat remains closed to accelerate the warm up process. After a few minutes, it opens up to allow the warm fluid to flow. If your vehicle is overheating but not blowing warm air from the heater, the problem is more than likely your thermostat.

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Thermostat - 80°C

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T#:594737

Part#: 11531254065

Back Ordered

$ 22.99

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

$ 21.99 USD

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$ 21.99 USD

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The thermostat on your vehicle controls the flow of coolant based on temperature. When you just start your engine, the thermostat remains closed to accelerate the warm up process. After a few minutes, it opens up to allow the warm fluid to flow. If your vehicle is overheating but not blowing warm air from the heater, the problem is more than likely your thermostat.

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Mahle Thermostat - 80ï¿½C - E12, E23, E24, E28

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T#:591826

Part#: 11539055588

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$ 22.99

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

$ 21.99 USD

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$ 21.99 USD

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Stop your overheating problem.

Coolant Expansion Tank

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T#:17538753

Part#: 17138616418

Back Ordered

$ 68.99

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

$ 66.99 USD

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$ 66.99 USD

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