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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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Coolant Hose - Return Line

T#:30729013

Part#: 17128570061

In Stock

Sale - Save 19% $ 36.99

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

$ 29.99 USD

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Thermostat - B48

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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Connector - Upgraded Aluminum Metal

T#:27205374

Part#: 11118511205

In Stock

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05-03-2026

$ 34.39 USD

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Hose F Engine Inlet-Changeover Valve

T#:30729011

Part#: 17128616914

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05-03-2026

$ 56.30 USD

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$ 56.30 USD

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Water Pump - N20 N26

T#:29666093

Part#: 11518635089

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$ 275.19 USD

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A failing water pump can show early warning signs like coolant leaks or a whining noise from the engine bay—but with electric water pumps, failure can be sudden, often with no warning beyond rapid overheating.

If you suspect your water pump is on its way out, prompt replacement is critical to avoid engine damage. Stay alert to any changes in cooling system performance.

Note: Aluminum mounting bolts are single-use and must be replaced during installation.

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Engine Coolant Expansion Tank

T#:30729009

Part#: 17138677649

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05-03-2026

$ 75.59 USD

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Cylinder Head Expansion Tank Hose - Priced Each

T#:30729010

Part#: 17129845173

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$ 24.47 USD

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Coolant Hose - Upper

T#:30729016

Part#: 17127596837

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$ 52.22 USD

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Bremmen Water Pump Bolt - M8x34 - BMW N20 2.0L

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

T#:5649968

Part#: 11127810707

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$ 17.99

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05-03-2026

$ 13.99 USD

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Coolant Expansion Tank Cap

T#:36032339

Part#: 17117639020

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05-03-2026

$ 11.99 USD

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$ 11.99 USD

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Meyle - Water Pump with Gasket

T#:40342902

Part#: 11518638026

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$ 97.99 USD

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$ 97.99 USD

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Ensure your BMW stays cool and runs efficiently with the trusted performance of the Meyle Water Pump with Gasket 313 220 0031.

Meyle Coolant Expansion Tank - F22/23 230/M240, F3X 330/340/430/440 B...

We Price Match - Give Us A Call or Chat!

T#:5704977

Part#: 17138677649

In Stock at Vendor

$ 164.99

This product was last offered at the strikethrough price on
03-20-2026

$ 123.99 USD

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$ 123.99 USD

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We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of fewer than six to eight years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on.

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Coolant Hose - Lower

T#:48125816

Part#: 17127596838

In Stock

Sale - Save 15% $ 30.99

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

$ 26.34 USD

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$ 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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Meyle Coolant Pump Thermostat - 87 Degrees - BMW N47 N57

T#:55497457

Part#: 3282280010

Ships on Nov 12, 2026

$ 35.99

This product was last offered at the strikethrough price on
06-30-2026

$ 16.99 USD

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$ 16.99 USD

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Keep your engine operating in its powerband and prevent performance-robbing heat soak with this replacement coolant thermostat from Meyle. A failing or sticky thermostat can ruin a track day or spirited drive, making a fresh, high-quality replacement essential for keeping your cooling system performing at its peak under heavy load. Engineered for crisp, reliable valve activation, it ensures your cooling system sheds heat efficiently when you are pushing your vehicle to its limits.

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Meyle Thermostat Housing - BMW E84, F10, F22, F26, F30, F31, F32, F33...

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T#:5704976

Part#: 11538635689

Special Order: No Guaranteed ETA

$ 72.99 USD

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$ 72.99 USD

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When it comes to your temperature gauge on your instrument cluster your thermostat plays a large role in where that temperature needle ends up. There are many cases where the vehicle will run a bit cool according to that gauge, oftentimes meaning the thermostat has failed and is stuck open allowing coolant to continuously circulate. The other more damaging side is when it closes shut and keeps the engine from cooling down properly. All vehicles are designed to operate in an ideal temperature range for the ultimate efficiency, life, and performance.

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Meyle Charge Air Cooler Expansion Tank - F22, F23, F30, F31, F32, F33...

T#:40714794

Part#: 17138617045

Special Order: No Guaranteed ETA

$ 72.99 USD

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$ 72.99 USD

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Keep your turbocharged BMW operating at its best with the Meyle Charge Air Cooler Expansion Tank 314 223 0025.

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