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Mahle-Behr BMW Cooling System Parts & Accessories for BMW E39 M5 S62 5.0L

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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E39 M5 00-03 OEM Behr Radiator

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

T#:1341

Part#: 17111436062

In Stock at Vendor

$ 327.54 USD

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$ 327.54 USD

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OEM BEHR brand replacement radiator for all E39 M5, as produced in 2000, 2001, 2002 and 2003. This radiator is made by BEHR, an original equipment supplier to BMW. BEHR radiators are what we use our own BMWs and customer installs. We've found the BEHR radiator has the highest lifespan, least amount of manufacturing defects, and best continued cooling performance on the E39 M5. Simply put, you do not want anything else in your M5 but a BEHR brand radiator.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This BEHR radiator fits the following BMWs:
2000-2003 E39 M5 sedan

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Electric Auxiliary Fan - E39 1999-2003

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

T#:377040

Part#: 64546921395

In Stock at Vendor

$ 416.64

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

$ 393.29 USD

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$ 393.29 USD

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This electric auxiliary fan for BMW E39 525i 528i 530i 540i M5 1999-2003 mounts in front of the radiator and is designed to push air through the A/C Condenser and main radiator. It provides additional cooling for when the car is in traffic. It is a common failure item. If your engine temps are creeping up or if your A/C isn't blowing cold this could be the cause.

This item fits the following BMWs:
1999-2003 E39 BMW 525i 528i 530i 540i M5

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OEM Mahle-Behr Fan Clutch - E39 M5, Z8

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

T#:373957

Part#: 11527830486

In Stock at Vendor

$ 366.02

This product was last offered at the strikethrough price on
04-10-2026

$ 360.00 USD

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$ 360.00 USD

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This OEM Mahle-Behr fan clutch is a direct replacement for your original fan clutch. Has your fan clutch failed or is beginning to fail? A failing fan clutch will cause the engine fan to either not turn at all, or to turn very slowly and lifelessly, providing insufficient cooling for the radiator (especially noticeable while idling or in stop/go traffic).

This item fits the following BMWs:
1998-2003 E39 BMW M5
2000-2003 E52 BMW Z8 Roadster

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OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 ...

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

T#:2766

Part#: 17111742231

In Stock

$ 19.99 USD

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$ 19.99 USD

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This radiator expansion tank cap is used most BMW's from 1991-2006. It is a common failure item. When this item fails, it cannot hold pressure which results in your BMW overheating. If you are overhauling your coolant system, now is the time to consider preventative replacing this cap. It is also referred to as the coolant reservoir cap.

Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.

This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ic 323is 323ic 325i 325is 325ic 328i 328is M3
1999-2005 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3
1989-1995 E34 BMW 530i 535i 540i M5
1991-1995 E34 BMW 525i
1997-2003 E39 BMW 525i 528i 530i 540i M5
1989-1994 E32 BMW 735i 735il 740i 740il 750il
1995-2001 E38 BMW 740i 740il 750il
2002-2008 E65 BMW 745i 745li 750i 750li 760i 760li
1990-1998 E31 BMW 840i 840ci 850i 850ci 850csi
2004-2011 E83 BMW X3 2.5i X3 3.0i X3 3.0si
2000-2006 E53 BMW X5 30.0i X5 4.4i X5 4.6is X5 4.8is
1996-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Coupe M Roadster
2003-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si M Roadster M Coupe
2000-2003 E52 BMW Z8 Z8 Alpina
2007+ E90 BMW 335i & 335xi

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Mahle-Behr BMW Cooling System Parts & Accessories for BMW E39 M5 S62 5.0L

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E39 M5 00-03 OEM Behr Radiator

Electric Auxiliary Fan - E39 1999-2003

OEM Mahle-Behr Fan Clutch - E39 M5, Z8

OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 ...

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