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BMW Cooling System Parts & Accessories for BMW E90 M3 S65 4.0L

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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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Water Pump And Thermostat Kit - E9X M3

10X Entries Into Our F80 M3 Sweepstakes

T#:554059

Part#: 11517838201KT4

Ships in 1 Business Day

Sale - Save 9% $ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 202.73 USD

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Sale - Save 9%

$ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 202.73 USD

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The water pumps in BMW's should be serviced near 80,000 miles and may become an issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road.

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Thermostat Replacement Kit - E9X M3

10X Entries Into Our F80 M3 Sweepstakes

T#:554084

Part#: 11537836155KT2

Ships in 1 Business Day

Sale - Save 14% $ 99.99

This product was last offered at the strikethrough price on
06-16-2026

$ 86.04 USD

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Sale - Save 14%

$ 99.99

This product was last offered at the strikethrough price on
06-16-2026

$ 86.04 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.

Basic Cooling System Service Kit - E9X M3 S65

10X Entries Into Our F80 M3 Sweepstakes

T#:557214

Part#: E9XM3BCKT

Ships in 1 Business Day

$ 567.99

This product was last offered at the strikethrough price on
07-08-2026

$ 554.99 USD

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$ 554.99 USD

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To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

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Basic Cooling System Service Kit - E9X M3 S65 - Dry

10X Entries Into Our F80 M3 Sweepstakes

T#:53891614

Part#: 17112283500KT

Ships in 1 Business Day

$ 540.99

This product was last offered at the strikethrough price on
07-08-2026

$ 526.99 USD

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$ 526.99 USD

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High Performance Cooling System Upgrade - E9X M3 (04/2008+)

10X Entries Into Our F80 M3 Sweepstakes

T#:557320

Part#: E9XM3PCKT

Ships in 1 day

$ 2,336.08

This product was last offered at the strikethrough price on
08-24-2026

$ 2,333.70 USD

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$ 2,333.70 USD

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To ensure your BMW keeps cool on the track, we have built out our new High Performance Cooling System Upgrade kits. Featured in this kit is everything you will need to redo your cooling system from top to bottom with OEM components, with select stock components swapped out for the high performance alternative!

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High Performance Cooling System Upgrade - E9X M3 (up to 04/2008) ...

10X Entries Into Our F80 M3 Sweepstakes

T#:557321

Part#: E9XM3PCKT2

Ships in 1 day

$ 2,322.15

This product was last offered at the strikethrough price on
08-24-2026

$ 2,319.77 USD

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$ 2,319.77 USD

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To ensure your BMW keeps cool on the track, we have built out our new High Performance Cooling System Upgrade kits. Featured in this kit is everything you will need to redo your cooling system from top to bottom with OEM components, with select stock components swapped out for the high performance alternative!

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Water Pump And Thermostat Kit

10X Entries Into Our F80 M3 Sweepstakes

T#:15744014

Part#: 82142209769-KT

Ships in 1 Business Day

Sale - Save 9% $ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 202.73 USD

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Qty

Sale - Save 9%

$ 222.99

This product was last offered at the strikethrough price on
05-03-2026

$ 202.73 USD

Add to Wish List

The water pumps in these BMW models should be serviced near 80,000 miles and may become an issue often times leaving the owner stranded. The aftermarket kit offered provides a single stop for water pump and thermostat replacement needs to save the search and get you back on the road. Kit includes: Mahle-Behr thermostat Geba water pump Vaico coolant Mounting hardware required for the water pump O-rings for the thermostat housing

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Gates Performance Thermostat - 71*C - BMW S65 S85

T#:394624

Part#: 11537836155

In Stock

$ 78.99 USD

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$ 78.99 USD

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Performance low-temperature thermostat for E90, E92, E93 M3 - S65 engine- E60 M5 E63 M6 with S85 engine. Your car may still operate fine according to the instrument display but the electrically-operated thermostat may be going bad.

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BMW Coolant / Antifreeze - 1.5L

We Price Match - Give Us A Call or Chat!

T#:16175674

Part#: 82141467704

Ships on Jan 11, 2027

$ 70.99 USD

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$ 70.99 USD

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Coolant G11 (Concentrate). The right anti-freeze agent makes a key contribution towards the reliable functioning of the engine cooling system under all operating and weather conditions. Cooler anti-freeze agents from Febi are precisely matched to the special requirements of the vehicle manufacturer and offer reliable protection from damages caused by freezing, corrosion, and cavitation. A good functioning cooling system is a primary prerequisite for the optimum operation of the engine. The ideal mixing ratio is 1:1, which offers frost protection to -36° C. With a ratio of 1:1 of water and concentrate, the boiling point of the cooling is approximately 107° C.+ High protection against freezing, corrosion, and cavitation Prevention of deposits and foam formation

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Febi Temperature Sensor

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T#:340711

Part#: 13621433076

In Stock

$ 17.99

This product was last offered at the strikethrough price on
06-22-2026

$ 16.99 USD

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$ 16.99 USD

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Monitors coolant / oil temperature

Radiator Support Bracket

T#:371231

Part#: 17117514402

In Stock

$ 7.99

This product was last offered at the strikethrough price on
06-19-2026

$ 5.09 USD

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$ 5.09 USD

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Expansion Tank Cap

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T#:382437

Part#: 17117639021

Special Order: No Guaranteed ETA

$ 25.99 USD

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$ 25.99 USD

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Maintain maximum cooling efficiency and system pressure with this Febi Bilstein 2.0 bar replacement cap.

Fluid Level Sensor

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:5973204

Part#: 17117546548

Ships on Oct 30, 2026

$ 13.99 USD

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$ 13.99 USD

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MEYLE-ORIGINAL: True to OE fluid level sensor. Used in multiple locations. Wulf Gaertner Autoparts AG manufactures and markets automotive spare parts under its MEYLE brand. Since its foundation in 1958, Wulf Gaertner Autoparts has been an owner-operated, unlisted family business on the aftermarket scene. Since 1995, Wulf Gaertner Autoparts AG has been manufacturing and trading under its MEYLE brand. They pride themselves on top-grade quality-tested spare parts for passenger cars, vans and commercial vehicles. Comparable OE Cross Reference - 17117546548

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