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BMW Cooling System Parts & Accessories for BMW 7 Series E66 (2002-2008)

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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 - 105C

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T#:15511827

Part#: 11537502779

Ships on Aug 3, 2026

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05-03-2026

$ 45.58 USD

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$ 46.99

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

$ 45.58 USD

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If your vehicle is experiencing cooling issues, chances are the thermostat is the cause. Common symptoms include prolonged warm-up at highway speeds from the thermostat being stuck open, or consistent overheating issues from the thermostat being stuck in the closed position. Either condition can result in poor performance, and potential damage to vital components in your vehicle.

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Engine Water Pump Gasket Kit

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T#:54317216

Part#: 359.200

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$ 12.99 USD

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$ 12.99 USD

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This Elring water pump gasket set is the perfect solution for refreshing your BMW's cooling circuit during a water pump service or cooling system overhaul.

2 Pin Connector

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T#:33412932

Part#: 61132359999

Ships on Jul 28, 2026

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This product was last offered at the strikethrough price on
06-14-2026

$ 8.24 USD

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$ 10.99

This product was last offered at the strikethrough price on
06-14-2026

$ 8.24 USD

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Includes connector housing with terminals and seals. Commonly used for the coolant level sensor.

ECS Tuning replacement harness connectors include all necessary pins and wire seals for a complete harness repair. Whether you have a broken harness connector or need a complete wiring repair, we have the components you need.

Each connector includes an additional terminal in case one becomes lost or damaged during installation.

*OEM cross reference PN# 61132359999 - Commonly used for the coolant level sensor.

Please reference the original part number from the existing connector to confirm fitment, before ordering.

Suggested tools:

Suggested crimping pliers: T#387193
Wire De-pin tools:
12pc De-Pin Tool Set - T#386379
23pc De-Pin Tool Set - T#641943

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BMW Oil Cooler

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T#:38385316

Part#: 17217507974

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$ 66.99 USD

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The BMW oil cooler maintains optimal engine oil temperature, preventing overheating and ensuring proper lubrication for improved performance and longevity.

Meyle Engine Coolant Thermostat - BMW FXX, GXX

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T#:52797701

Part#: 3282280016

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$ 47.99 USD

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This MEYLE thermostat ensures your engine stays at the perfect temperature for efficiency and power.

Fluid Level Sensor

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T#:5973204

Part#: 17117546548

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$ 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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Auxillary Fan Switch

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T#:4934936

Part#: 3148210000

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$ 18.99 USD

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The auxiliary fan switch activates the auxiliary cooling fan to provide additional cooling under high heat loads, and when the car is stationary. Also known as the coolant temperature sending unit, comes with related o-ring

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Rein Coolant Return Pipe - N62 N73

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T#:386411

Part#: 11511439976

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$ 14.99 USD

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$ 14.99 USD

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This is the coolant return pipe on the back of the water pump on the N62 and N73 engines used in the E53 X5, E60 545/550, E63 645/650, E65 745/750, E70 X5, and F02 750. This pipe connects the water pump to the valley pan and it's a compression fitting (no o-rings). Whenever the water pump or valley pan are replaced this tube should also be replaced. This is one area where you don't want to go back and re-do your work because of a leaking fitting! In German, Rein means Pure. In the automotive industry the Rein name has quickly come to represent quality. With fitments for some of the worldaEURtms finest automobiles including BMW and Mini and guaranteed OE quality, Rein is a name you can trust.

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Auxiliary Fan Switch

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T#:376847

Part#: 13621433077

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$ 10.99 USD

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Comes with related o-ring

OEM Rein Coolant Supply Hose - E65 E66

For vehicles with production date up to 09/2003

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T#:375745

Part#: 17127508010

Ships on Jul 27, 2026

$ 134.99

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

$ 127.99 USD

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Over time, coolant hoses begin to get brittle and are susceptible to cracking and splitting. Replace your cracked or leaking coolant hose to prevent further leaks and potentially catastrophic failure.

Radiator Support Bracket

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T#:14122755

Part#: 17117514402

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$ 8.99 USD

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Mounts to top of radiator bracket, 2 per vehicle.

Coolant Hose

For vehicles with production date up to 09/2003

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T#:379702

Part#: 17127508014

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$ 25.99 USD

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This is the return hose that attaches from the water pump to the radiator

BMW Heater Control Valve

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T#:16907152

Part#: 64110301939

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$ 199.99 USD

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This valve controls the flow of the coolant into the heater core, which allows warm air to be pushed through the HVAC system.

Radiator

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T#:594799

Part#: 17117585439

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$ 253.97 USD

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$ 253.97 USD

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Replace your leaking or high-mileage radiator.

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