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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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Facet Coolant Temperature Sensor - E36, Z3

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T#:12824

Part#: 61318376440

In Stock at Vendor

$ 37.99 USD

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$ 37.99 USD

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Engine radiator double temperature fan switch, 80/88 degree celsius. This switch is designed to activate the auxiliary fan at the specified temperatures.

This item fits the following BMWs:
1996-1998 E36 BMW 318i 318is 318ti 318ic
1996-1998 Z3 BMW Z3 1.9

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Facet Auxiliary Fan Switch – 80-88°C - E36, Z3

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T#:374929

Part#: 61318361787

Ships in 1-3 days

$ 38.20

This product was last offered at the strikethrough price on
05-11-2026

$ 38.13 USD

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$ 38.13 USD

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Restore the function of your fans.

Facet Radiator Fan Switch - E36 1996-1999, Z3 1997-2002

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T#:641875

Part#: 61318363677

In Stock at Vendor

$ 39.38

This product was last offered at the strikethrough price on
05-11-2026

$ 39.28 USD

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$ 39.28 USD

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This is the E36, Z3 engine radiator double temperature fan switch, 91/99 degree Celsius. This switch is designed to activate the auxiliary fan at the specified temperatures. A faulty switch can lead to the auxiliary fan not activating, causing overheating. This item fits the following BMWs: 1996-1998 E36 BMW 323is 323ic 328i 328is 328ic M3 5/1997-2002 Z3 BMW Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe

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Facet Radiator Fan Switch - E24, E28, E30, E31, E32, E34, E36, Z3 ...

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T#:375144

Part#: 61311378073

In Stock

$ 44.99 USD

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$ 44.99 USD

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Measures radiator air temperature enabling the fan to turn off or on

Behr Radiator - E36

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T#:1196128

Part#: 17111723784

In Stock at Vendor

$ 298.35 USD

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$ 298.35 USD

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Brand new radiator equivalent to OE

MINI R56 Thermostat Housing W/ Thermostat Kit - Priced As Kit ...

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T#:583871

Part#: 11538699290

In Stock

$ 110.15

This product was last offered at the strikethrough price on
03-09-2026

$ 95.99 USD

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$ 95.99 USD

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MINI R56 Thermostat Housing W/ Thermostat Kit - Priced As Kit is an essential component for maintaining proper engine temperature and performance in your MINI R56. This comprehensive kit includes all necessary parts to ensure a complete and reliable replacement.

Complete Kit: Includes thermostat housing, profile gasket, temperature sensor, two O-rings, clip, and bleeder screw.
Prevents Leaks: Addresses common issues such as cracking and leaks around the gasket seal.
Optimal Performance: Ensures proper control of coolant flow to maintain engine temperature.
Direct Replacement: Designed to fit precisely and function as the original part.
High-Quality Materials: Made from durable materials to ensure long-lasting performance and reliability.

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Coolant Temperature Sender

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T#:586992

Part#: 12621747281

Ships in 1 Business Day

$ 23.99

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

$ 21.99 USD

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$ 21.99 USD

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Facet Coolant Temperature Sensor - E38, E39

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T#:2170

Part#: 61318360857

Ships in 1 Business Day

$ 31.70 USD

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$ 31.70 USD

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Engine radiator double temperature fan switch, 91/104 degree celsius. This switch is designed to activate the auxiliary fan at the specified temperatures.

This item fits the following BMWs:
1997-1998 E39 BMW 528i 540i
1995-1998 E38 BMW 740i 740il

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Hella Radiator - Manual - E34

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T#:363371

Part#: 17111737760

In Stock at Vendor

$ 687.60 USD

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$ 687.60 USD

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Replace your leaking radiator

Radiator

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T#:591360

Part#: 17111728905

Back Ordered

$ 399.99

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

$ 388.99 USD

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$ 388.99 USD

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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 Radiator - E60, E61, E63, E64

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T#:579569

Part#: 376755591

Back Ordered

$ 267.99 USD

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$ 267.99 USD

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Replace your leaking radiator

E46 323/325/328/330 Manual, Z4 OEM Behr Radiator

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T#:338021

Part#: 17119071518

In Stock at Vendor

Starting at $ 249.99 USD

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Starting at $ 249.99 USD

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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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REMOTE RADIATOR

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T#:33047035

Part#: 17117634565

In Stock at Vendor

$ 156.99

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

$ 151.99 USD

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$ 151.99 USD

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Behr Radiator Replacement

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For Automatic Vehicles only

T#:591355

Part#: 17117519211

In Stock at Vendor

$ 454.11 USD

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$ 454.11 USD

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Replace your faulty or worn radiator with this factory replacement

Water Temperature Sensor

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T#:594840

Part#: 13627535068

Ships in 1 Business Day

$ 18.99

This product was last offered at the strikethrough price on
05-04-2026

$ 12.99 USD

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$ 12.99 USD

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Radiator

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T#:594798

Part#: 17117576827

Ships in 1-2 days

$ 415.99 USD

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$ 415.99 USD

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Replacement Radiator from Behr Hella

Radiator

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T#:594800

Part#: 17117605644

Ships on Jul 27, 2026

$ 362.99 USD

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$ 362.99 USD

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Replacement Radiator from Behr

Radiator

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T#:594801

Part#: 17117570094

Ships on Jul 27, 2026

$ 374.99 USD

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$ 374.99 USD

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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 Radiator - E34

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T#:1195792

Part#: 17111723467

Back Ordered

$ 273.99

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

$ 265.99 USD

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$ 265.99 USD

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OE replacement radiator

Facet Thermostat With Adapter - E70, E90

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T#:554060

Part#: 11517805811

Back Ordered

$ 75.99

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

$ 73.99 USD

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$ 73.99 USD

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Includes gasket and O-rings

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