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BMW Cooling System Parts & Accessories for BMW 7 Series E65 (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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Coolant Hose

For vehicles with production date from 09/2003

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T#:379683

Part#: 17127568246

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08-31-2026

$ 36.09 USD

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

Expansion Tank Vent Hose

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T#:592006

Part#: 17127541146

In Stock at Vendor

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08-31-2026

$ 35.14 USD

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Replace your leaking hose

Rein Radiator Hose - Upper - E65, E66

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T#:379749

Part#: 17127535742

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Sale - Save 5% $ 89.99

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08-31-2026

$ 85.49 USD

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$ 89.99

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A common source of cooling system failure

Rein Coolant Vent Pipe - E65, E66

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T#:591999

Part#: 17127534527

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$ 29.44 USD

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Connects the radiator to the expansion tank

OEM Rein Coolant Expansion Tank Hose - Lower - BMW E65/66 7 Series ...

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T#:375750

Part#: 17127508015

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$ 28.49 USD

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Attaches from the bottom fitting on the expansion tank to the supply hose. 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.

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Rein Cooling O-Ring - E53, E60, E63, E64, E65, E66, E70

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T#:362446

Part#: 11531710048

In Stock

Sale - Save 5% $ 4.07

This product was last offered at the strikethrough price on
08-31-2026

$ 3.87 USD

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$ 4.07

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Seals the rear of the water transfer pipe to the block

Meyle Expansion Tank Cap

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T#:579357

Part#: 3148009004

In Stock

Sale - Save 40% $ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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$ 14.99

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Replace worn or missing pieces.

Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4 ...

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T#:640208

Part#: 17117639022

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Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 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. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...

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T#:340541

Part#: 17111742231

Ships in 1 Business Day

Sale - Save 5% $ 17.99

This product was last offered at the strikethrough price on
08-31-2026

$ 17.09 USD

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$ 17.99

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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.

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Rein Coolant Expansion Tank - E65, E66

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T#:593077

Part#: 17137647713

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Sale - Save 5% $ 99.99

This product was last offered at the strikethrough price on
08-31-2026

$ 94.99 USD

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$ 99.99

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$ 94.99 USD

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Replace your cracked or faded tank

Expansion Tank Vent Hose

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T#:379672

Part#: 17127508013

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Sale - Save 5% $ 60.99

This product was last offered at the strikethrough price on
08-31-2026

$ 57.94 USD

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A commonly leaking hose

OEM Rein Coolant Hose w/ Temperature Sensor - BMW E60 E63/E64 E65/E66...

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T#:375746

Part#: 17127508011

In Stock at Vendor

Sale - Save 5% $ 75.99

This product was last offered at the strikethrough price on
08-31-2026

$ 72.19 USD

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$ 75.99

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This hose runs from the lower radiator port on the passenger side of the radiator to the water pump on the engine. Rubber hoses can crack over time, leading to coolant loss. Replace your hose with this OEM Rein hose to eliminate leaks and prevent overheating.

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OEM Rein Coolant Hose - BMW E60 E63/E64 E65/E66

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T#:45791754

Part#: 17127508011R

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Sale - Save 6% $ 35.99

This product was last offered at the strikethrough price on
08-31-2026

$ 33.75 USD

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$ 33.75 USD

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This hose runs from the lower radiator port on the passenger side of the radiator to the water pump on the engine. Rubber hoses can crack over time, leading to coolant loss. Replace your hose with this OEM Rein hose to eliminate leaks and prevent overheating.

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Cool Retrun Hose

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T#:379713

Part#: 17127540666

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Sale - Save 5% $ 80.99

This product was last offered at the strikethrough price on
08-31-2026

$ 76.94 USD

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$ 80.99

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$ 76.94 USD

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Connects to the radiator

Auxiliary Electric Water Pump

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T#:57014181

Part#: 64116913489

Ships on Sep 18, 2026

$ 75.99 USD

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$ 75.99 USD

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Keep your heating and cooling systems performing sharply with a precision-fit replacement built for long-haul reliability.

Bav Auto Temperature Sensor - BMW E39 E46 E9X E60 F01/02

10X Entries Into Our F80 M3 Sweepstakes

T#:639833

Part#: 13621433076

In Stock

Sale - Save 20% $ 14.99

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

$ 11.99 USD

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$ 11.99 USD

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This is the coolant temperature sensor used in many BMW models from the late-1990s to the mid-2010s. The engine computer relies on the coolant temp to set the fuel mapping for the engine. As the car warms up the computer changes the fuel mixture. If your car is running a bit rich (too much fuel) it could be because this sensor is failing and not sending the correct info to the computer. This sensor is located in a variety of places depending on the engine. But it's one of those easy replacement items 'while you're in there' when doing a water pump or thermostat replacement. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Meyle Engine Coolant Thermostat - BMW FXX, GXX

5X Entries Into Our F80 M3 Sweepstakes

T#:52797701

Part#: 3282280016

Ships on Sep 18, 2026

$ 47.99 USD

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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.

Auxillary Fan Switch

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T#:4934936

Part#: 3148210000

Ships on Sep 18, 2026

$ 18.99 USD

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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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Fluid Level Sensor

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T#:5973204

Part#: 17117546548

Ships on Sep 18, 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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Coolant Hose

For vehicles with production date up to 09/2003

2X Entries Into Our F80 M3 Sweepstakes

T#:379702

Part#: 17127508014

Back Ordered

Sale - Save 5% $ 25.99

This product was last offered at the strikethrough price on
08-31-2026

$ 24.69 USD

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$ 25.99

This product was last offered at the strikethrough price on
08-31-2026

$ 24.69 USD

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

Rein Coolant Return Pipe - N62 N73

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T#:386411

Part#: 11511439976

Back Ordered

Sale - Save 11% $ 14.99

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

$ 13.29 USD

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$ 14.99

This product was last offered at the strikethrough price on
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$ 13.29 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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OEM Rein Coolant Supply Hose - E65 E66

For vehicles with production date up to 09/2003

2X Entries Into Our F80 M3 Sweepstakes

T#:375745

Part#: 17127508010

Ships in 3 Business Days

Sale - Save 5% $ 134.99

This product was last offered at the strikethrough price on
08-31-2026

$ 128.24 USD

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$ 134.99

This product was last offered at the strikethrough price on
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$ 128.24 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

Back Ordered

Sale - Save 13% $ 8.99

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

$ 7.83 USD

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$ 8.99

This product was last offered at the strikethrough price on
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$ 7.83 USD

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Mounts to top of radiator bracket, 2 per vehicle.

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