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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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Thermostat Replacement Kit - E39 M5

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

T#:554086

Part#: 11537835558KT7

Ships in 2 Business Days

$ 170.99

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

$ 165.99 USD

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$ 165.99 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

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

T#:338714

Part#: TMS14418

Ships in 1 Business Day

$ 1,201.99

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

Starting at $ 1,190.65 USD

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Starting at $ 1,190.65 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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