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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

Ships in 2 Business Days

$ 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 1-2 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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Aluminum Thermostat Housing Kit - M50

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T#:397222

Part#: 14-009

In Stock

$ 56.99

This product was last offered at the strikethrough price on
06-18-2026

$ 52.99 USD

Limited Qty Sale

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$ 56.99

This product was last offered at the strikethrough price on
06-18-2026

$ 52.99 USD

Limited Qty Sale

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Plastic thermostat housing cracked on your M50?

Here are your choices: you can wait for the plastic factory thermostat housing cover to break and cause major overheating. (Even with a new stock cover, it won’t take long.) Or you can install a thoughtfully engineered all-aluminum thermostat housing cover from Active Autowerke and never experience this type of failure again. Currently there is no factory upgraded part to this problem. This is an aluminum extruded part that has all of the openings machine properly to fit like factory; from the mounting bolt holes, the seating of the thermostat to the sealing opening for the ORANGE gasket. Forged to exact factory tolerances, everything fits and this unit is a true easy bolt-on – especially suited for racing or load conditions like heavy traffic, where engine temp can rise rapidly. The housing is guaranteed never to break from overheating or over-tightening, and its CNC machined surface ensures a precise seat.

Unit comes complete with a new ORANGE sealing gasket; a new thermostat is recommended but not included.
For hotter climates, a 71 degree thermostat is recommended over the 82 degree unit.

Anything and everything BMW is the mantra at Active Autowerke. Since 1981 they have been serving the BMW community with custom turbocharger kits to a myriad of other innovative and inspiring performance parts.

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

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

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

Active Autowerke Sport Fan Clutch - E36 E46

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T#:397219

Part#: 14-010

Ships in 3 Business Days

5% off MSRP $ 259.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 246.99 USD

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5% off MSRP

$ 259.00

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 246.99 USD

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When you push your powerplant, thermodynamics push right back. The toll of high performance is higher heat load – and many stock components begin to complain. But Active Autowerke has you covered - this upgraded fan clutch increases viscous coupling of cooling fan blade speed to water pump speed, yielding increased airflow through the radiator for more efficient cooling. A simple, yet wonderful, thing.

This product fits the following BMWs:
1992-1999 E36 323i 325i 328i 330i M3
1998-2006 E46 323i 325i 328i 330i M3

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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 2 Business Days

$ 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 2 Business Days

$ 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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Active Autowerke Thermostat Bypass/Delete Tube - S65

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T#:2302749

Part#: 14-016

Ships on Jul 24, 2026

$ 141.99 USD

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$ 141.99 USD

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CNC machined coolant/water thermostat bypass tube to improve flow on and off the track. Easy plug and play installation and a durable anodized coating make this a simple and reliable temperature control solution.

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Active Autowerke Cnc Aftercooler Cooling Kit - F8x S55

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T#:5886968

Part#: 15-012

Ships in 4 Business Days

$ 2,849.99 USD

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$ 2,849.99 USD

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BMW's S55 motor is a modern marvel but one weak point, which Active identified is the entire cooling system for the intake which comprises the charge pipe, the aftercooler and the heat exchanger (or radiator). Finally there is a S55 aftercooler kit upgrade that is good enough to carry the Active Autowerke brand. Years of success in developing cars for motorsport has allowed Active to leverage its expertise to the top-mount charge air cooler on the F80 M3, F82 M4 and F87 M2 Competition. This aftercooler was made for the S55 and crafted using only high-grade aluminum to outperform the factory aftercooler in all situations from everyday driving to the toughest racing. The factory cooler was built to support a specific power target and environment. Many of you have increased the performance of the S55 which quickly overwhelms the stock cooler leading to heat soak and higher intake air temperatures which triggers the ECU to downgrade the performance until cooler air returns. Active's focus was not on a mass-market aesthetic add-on but a properly engineered improvement over the existing hardware. Active uses a tube-and-fin core designed specifically for the S55 and included turbulators to maximize the cooling efficiency in as small a package as possible. The end tanks are billet machined aluminum, not cast, folded, or bonded and ensure even distribution of the water throughout the internal aftercooler cores. High precision fittings, CNC machining, and TIG welding throughout ensures the highest quality construction to prevent pressure loss, and the lowest weight, in a bolt-on replacement. But Active also didn’t leave the aesthetics by the wayside as we dip the visible top of the aftercooler in a carbon fiber coating giving your installed cooling system a decidedly top market look to match the improved cooling performance. The Active silicone charge pipes for the F80 M3, F82/F83 M4 and the F87 M2 Competition improve the flow over the stock, compressed plastic pipes. The Active Silicone Charge Pipes allow you to maximize power on your F8X by securing all the boost that your S55 is making. These pipes replace the hot-side pipes leaving the turbos and into the top-mount aftercooler. The stock S55 charge pipes are notorious for developing hairline fractures at their plastic seams. These fractures or cracks are unnoticeable to the naked eye, but under boost pressure they open up leaking the desired charged air into the engine bay, and consequently can rob your S55 of it's full power potential. In addition, these leaks can trigger your S55's turbochargers to work harder to hit and maintain target boost pressure, potentially wearing them out sooner. Active uses silicone in this area because it will not contribute to heat soak and it's easier to mold for the correct clearances. Active uses a 5-layer silicone hose with all needed adapters and stainless hose clamps included. It fits perfectly with our CNC’d top-mount cooler.

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Water Temperature Sensor

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T#:594840

Part#: 13627535068

Ships in 2 Business Days

$ 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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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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