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Bremmen Parts BMW Cooling System Parts & Accessories for BMW 3 Series F31 (2014+)

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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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Thermostat With Aluminum Housing - N20

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T#:30828065

Part#: 11538635689M

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05-03-2026

$ 100.36 USD

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Thermostat - B48

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For vehicles with the Gen1 B48/B46 only - not compatible with the later Gen2 B48 (TU) engines

T#:23648673

Part#: 11537644811

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05-03-2026

$ 190.39 USD

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$ 190.39 USD

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Coolant Hose - Return Line

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T#:30729013

Part#: 17128570061

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$ 29.99 USD

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$ 29.99 USD

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Connector - Upgraded Aluminum Metal

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T#:27205374

Part#: 11118511205

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$ 34.39 USD

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Engine Coolant Expansion Tank

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T#:30729009

Part#: 17138677649

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Sale - Save 12% $ 85.99

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$ 75.59 USD

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$ 75.59 USD

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Hose F Engine Inlet-Changeover Valve

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T#:30729011

Part#: 17128616914

Ships on Jul 6, 2026

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$ 56.30 USD

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Cylinder Head Expansion Tank Hose - Priced Each

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T#:30729010

Part#: 17129845173

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$ 24.47 USD

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Coolant Hose - Upper

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T#:30729016

Part#: 17127596837

Ships on Jul 6, 2026

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$ 52.22 USD

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Coolant Expansion Tank Cap

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T#:36032339

Part#: 17117639020

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$ 11.99 USD

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Bremmen Water Pump Bolt - M8x34 - BMW N20 2.0L

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T#:36913363

Part#: 11517602125

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$ 3.26 USD

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$ 3.26 USD

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This external torx head screw is a direct replacement for the costly OEM screw, which must be replaced during every water pump service.

Quantity 3 required for complete replacement.

Coolant Flange

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T#:5649968

Part#: 11127810707

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$ 17.99

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05-03-2026

$ 13.99 USD

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$ 17.99

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$ 13.99 USD

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Coolant Hose - Lower

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T#:48125816

Part#: 17127596838

Ships on Aug 10, 2026

Sale - Save 15% $ 30.99

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05-03-2026

$ 26.34 USD

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Connects the radiator to the thermostat.

Maintain optimal cooling performance with this high-quality Lower Radiator Hose (17127596838), built to match OEM dimensions for a seamless fit on your BMW. Designed to handle high heat and constant pressure, it ensures consistent coolant flow from the radiator to the thermostat housing. Perfect for preventative maintenance or replacing a failing hose, this direct-fit component helps safeguard your engine from overheating and keeps your cooling system operating at peak efficiency.

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