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

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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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Thermostat Replacement Kit - E39 M5
Thermostat Replacement Kit - E39 M5
Packaged by Turner - Corporate Logo
T#:554086
Part#: 11537835558KT7
Ships in 3 Business Days
$ 170.99

This product was last offered at the strikethrough price on
04-21-2026

$ 168.99 USD
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$ 168.99 USD
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When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

Kit includes:

  • Behr thermostat with gasket
  • Thermostat mounting hardware
  • 1 Gal Genuine BMW coolant

 

This thermostat fits the following BMWs: 
1998-2004 E39 BMW M5 

 

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Complete Cooling System Overhaul Package - 2000-2003 E39 M5
Complete Cooling System Overhaul Package - 2000-2003 E39 M5
Packaged by Turner - Corporate Logo
T#:338714
Part#: TMS14418
Ships in 1 day
$ 1,201.99

This product was last offered at the strikethrough price on
06-05-2026

Starting at $ 1,179.67 USD
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Starting at $ 1,179.67 USD
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This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1999-2003 E39 M5 with the S62 engine.

A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Keep on top of the cooling needs of your engine for your own piece of mind. Potential buyers also see the upside of a properly maintained car with receipts. Our bundled package includes the following:
  • OEM Behr radiator
  • OEM Laso or OE BMW water pump with gasket
  • OE BMW coolant temp sensor (located in the water pump housing)
  • OEM Behr thermostat with o-ring
  • OE BMW o-rings for the inner coolant tubes
  • OE BMW expansion tank cap
  • OE BMW upper and lower radiator hoses with OE-style clamps
  • OE BMW expansion tank hose with OE-style clamps
    Optional items (which can be added below):
    - OE BMW antifreeze
    - Add a new coolant level sensor (known for failing / throwing "check coolant" messages)
    - Add a new plastic expansion tank (if it's never been changed it's a risk of a crack or leak)
    - Add a new fan clutch

    Buy as a package and save $$$!

    This cooling system overhaul kit fits the following BMWs:
    1999-2003 E39 BMW M5
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    Cooling System Overhaul Kit - E39 M5
    Cooling System Overhaul Kit - E39 M5
    Packaged by Turner - Corporate Logo
    T#:554556
    Part#: 17111436062KT2
    Ships in 5 Business Days
    $ 2,392.99

    This product was last offered at the strikethrough price on
    08-14-2026

    $ 2,379.99 USD
    Add to Wish List
    $ 2,379.99 USD
    Add to Wish List
    This is a compete cooling system overhaul kit, which includes all the common cooling system failure parts bundled into a complete package. This cooling system package is for the 1999-2003 E39 M5 with the S62 engine. 

    A failure in the cooling system can lead to overheating and catastrophic engine failure. Don't gamble your engine! By replacing these core items preventatively, such as the thermostat housing, radiator, and waterpump, you are defusing what could be a ticking cooling system time bomb. And if you've had a failure of one of these parts, now is the time to refresh your entire cooling system. Keep on top of the cooling needs of your engine for your own piece of mind. Potential buyers also see the upside of a properly maintained car with receipts. 
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    E39 M5 00-03 OEM Behr Radiator
    E39 M5 00-03 OEM Behr Radiator
    Mahle-Behr - Corporate Logo
    T#:1341
    Part#: 17111436062
    In Stock at Vendor
    $ 327.54

    This product was last offered at the strikethrough price on
    08-14-2026

    $ 314.94 USD
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    $ 314.94 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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    OEM Mahle-Behr Fan Clutch - E39 M5, Z8
    OEM Mahle-Behr Fan Clutch - E39 M5, Z8
    Mahle-Behr - Corporate Logo
    T#:373957
    Part#: 11527830486
    Ships in 2 Business Days
    $ 366.02

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

    $ 359.97 USD
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    $ 359.97 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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    Electric Auxiliary Fan - E39 1999-2003
    Electric Auxiliary Fan - E39 1999-2003
    Mahle-Behr - Corporate Logo
    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 Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4
    OEM Behr Coolant Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 ...
    Mahle-Behr - Corporate Logo
    T#:2766
    Part#: 17111742231
    Ships in 3 Business Days
    $ 20.99

    This product was last offered at the strikethrough price on
    08-13-2026

    $ 19.99 USD
    Free Shipping on orders $49 and up
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    $ 19.99 USD
    Free Shipping on orders $49 and up
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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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