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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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Aluminum Thermostat Housing Kit - M50

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

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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Behr Radiator - E36

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

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

Active Autowerke Sport Fan Clutch - E36 E46

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

T#:397219

Part#: 14-010

Ships in 2 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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Hella Radiator - Manual - E34

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

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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Active Autowerke Thermostat Bypass/Delete Tube - S65

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

T#:2302749

Part#: 14-016

Ships in 10 Business Days

$ 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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Behr Radiator - E60, E61, E63, E64

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

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

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

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

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

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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Active Autowerke Cnc Aftercooler Cooling Kit - F8x S55

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

T#:5886968

Part#: 15-012

Ships in 3 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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Behr Radiator Replacement

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

Radiator

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

T#:594798

Part#: 17117576827

Ships in 1 day

$ 415.99 USD

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Qty

$ 415.99 USD

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Replacement Radiator from Behr Hella

Radiator

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

T#:594800

Part#: 17117605644

Ships on Jul 27, 2026

$ 362.99 USD

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Qty

$ 362.99 USD

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Replacement Radiator from Behr

Radiator

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

T#:594801

Part#: 17117570094

Ships on Jul 27, 2026

$ 374.99 USD

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Qty

$ 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

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

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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Qty

$ 265.99 USD

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OE replacement radiator

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