Home
Cooling

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

Clear BMW chassis

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.

Sub-Categories

Sort By:

Bav Auto Spill-Proof Coolant / Antifreeze Funnel

T#:580395

Part#: B8800082

In Stock

Sale - Save 15% $ 32.99

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

$ 28.04 USD

Add to Wish List

Qty

Sale - Save 15%

$ 32.99

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

$ 28.04 USD

Add to Wish List

Multiple adapters include to fit a variety of vehicles.

Bav Auto Fan Clutch Wrench - 32mm

T#:580348

Part#: B8800019

In Stock

Sale - Save 20% $ 29.99

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

$ 23.99 USD

Add to Wish List

Qty

Sale - Save 20%

$ 29.99

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

$ 23.99 USD

Add to Wish List

Used to remove your fan clutch

Red Line Supercool Performance Coolant - Concentrate - 1 Gallon ...

T#:640437

Part#: 81205

In Stock

$ 68.99 USD

Add to Wish List

Qty

$ 68.99 USD

Add to Wish List

Red Line SuperCool Concentrate fortified with WaterWetter is a concentrated antifreeze/coolant designed to maximize the performance of your cooling system with superior protection against cavitation corrosion/erosion. Using SuperCool Concentrate diluted with distilled water protects the entire cooling system keeping new components like new for 5 years/150,000 miles and prevents further damage to older components. Red Line’s proprietary coolant additive formula enhances the fluid’s ability to transfer heat, reducing operating temperatures by up to 20*F and prolonging the life of the entire cooling system. Red Line's SuperCool is an OAT coolant that is a Nitrate and Silicate Free product with its own proprietary corrosion technology to offer superior protection for aluminum engines found in all European vehicles, performance vehicles, as well as other applications. SuperCool will not void the factory warranty either. It can be used to top off the existing coolant of any BMW and will not cause any ill-effects on the cooling system because it is silicate and nitrate free. It is still better to flush it out and switch completely to SuperCool to get all the full benefits of the product in performance and protection.

Show More Show Less

Radiator / Cooling System Pressure Tester- Bavarian Autosport ...

T#:580397

Part#: B8800084

In Stock

Sale - Save 15% $ 146.99

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

$ 124.94 USD

Add to Wish List

Qty

Sale - Save 15%

$ 146.99

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

$ 124.94 USD

Add to Wish List

Red Line SuperCool Performance Coolant - Pre-Mixed - 1 Gallon ...

T#:640436

Part#: 81215

Ships on Aug 17, 2026

$ 54.99 USD

Add to Wish List

Qty

$ 54.99 USD

Add to Wish List

Red Line SuperCool Performance Coolant fortified with WaterWetter is a 50/50 prediluted antifreeze/coolant designed to maximize the performance of your cooling system with superior protection against cavitation corrosion/erosion. Using 100% SuperCool Performance protects the entire cooling system, keeping new components like new for 5 years/150,000 miles and prevents further damage to older components. Red Line’s proprietary coolant additive formula enhances the fluid’s ability to transfer heat, reducing operating temperatures by up to 20*F and prolonging the life of the entire cooling system. Red Line's SuperCool is an OAT coolant that is a Nitrate and Silicate Free product with its own proprietary corrosion technology to offer superior protection for aluminum engines found in all European vehicles, performance vehicles, as well as other applications. SuperCool will not void the factory warranty either. It can be used to top off the existing coolant of any BMW and will not cause any ill-effects on the cooling system because it is silicate and nitrate free. It is still better to flush it out and switch completely to SuperCool to get all the full benefits of the product in performance and protection.

Show More Show Less

Bav Auto Angled Hose Pinch Plier Set - 2pc

T#:580379

Part#: B8800058

In Stock

Sale - Save 25% $ 32.99

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

$ 24.74 USD

Add to Wish List

Qty

Sale - Save 25%

$ 32.99

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

$ 24.74 USD

Add to Wish List

Angled jaws close, creating a complete seal every time you use them - the jaws are offset, making it possible to use in hard-to-reach locations. Made of glass-filled nylon for extra strength. These are perfect for use with brake lines, etc.

Show More Show Less

Coolant Hose

For vehicles with production date from 09/2003

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:379683

Part#: 17127568246

Ships in 3 Business Days

$ 37.99 USD

Add to Wish List

Qty

$ 37.99 USD

Add to Wish List

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

Rein Coolant Vent Pipe - E65, E66

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:591999

Part#: 17127534527

Ships in 3 Business Days

$ 30.99 USD

Add to Wish List

Qty

$ 30.99 USD

Add to Wish List

Connects the radiator to the expansion tank

Expansion Tank Vent Hose

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:592006

Part#: 17127541146

In Stock at Vendor

$ 36.99 USD

Add to Wish List

Qty

$ 36.99 USD

Add to Wish List

Replace your leaking hose

Rein Radiator Hose - Upper - E65, E66

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:379749

Part#: 17127535742

Ships in 3 Business Days

$ 89.99 USD

Add to Wish List

Qty

$ 89.99 USD

Add to Wish List

A common source of cooling system failure

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

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:375750

Part#: 17127508015

Back Ordered

$ 29.99 USD

Add to Wish List

Qty

$ 29.99 USD

Add to Wish List

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.

Show More Show Less

Red Line Water Wetter Coolant Additive

T#:394769

Part#: REDLINE5A

In Stock

Starting at $ 15.99 USD

Add to Wish List

Starting at $ 15.99 USD

Add to Wish List

Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze.

Show More Show Less

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

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:362446

Part#: 11531710048

In Stock

$ 4.07 USD

Add to Wish List

Qty

$ 4.07 USD

Add to Wish List

Seals the rear of the water transfer pipe to the block

Red Line Water Wetter Heat Transfer Agent

T#:3607

Part#: 1-WW-12Z

In Stock

$ 15.99 USD

Add to Wish List

Qty

$ 15.99 USD

Add to Wish List

Water Wetter is a unique wetting agent for cooling systems which reduces coolant temperatures by as much as 30*F. This liquid product can be used to provide rust and corrosion protection in plain water for racing engines, which provides much better heat transfer properties than glycol-based antifreeze. Or it can be added to new or used antifreeze to improve the heat transfer of ethylene and propylene glycol systems. Designed for modern aluminum, cast iron, copper, brass, and bronze systems.

We have been using RedLine Oil in our street cars and race cars for years. Hands-down, it is the Number One brand of high performance lubricant for BMWs.

Show More Show Less

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

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:340541

Part#: 17111742231

In Stock

$ 17.99 USD

Add to Wish List

Qty

$ 17.99 USD

Add to Wish List

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.

Show More Show Less

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

T#:45791754

Part#: 17127508011R

Ships in 3 Business Days

$ 35.99 USD

Add to Wish List

Qty

$ 35.99 USD

Add to Wish List

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.

Show More Show Less

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

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:375746

Part#: 17127508011

In Stock at Vendor

$ 75.99 USD

Add to Wish List

Qty

$ 75.99 USD

Add to Wish List

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.

Show More Show Less

Cool Retrun Hose

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:379713

Part#: 17127540666

Ships in 3 Business Days

$ 80.99 USD

Add to Wish List

Qty

$ 80.99 USD

Add to Wish List

Connects to the radiator

Expansion Tank Vent Hose

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:379672

Part#: 17127508013

Ships in 3 Business Days

$ 60.99 USD

Add to Wish List

Qty

$ 60.99 USD

Add to Wish List

A commonly leaking hose

Rein Coolant Expansion Tank - E65, E66

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:593077

Part#: 17137647713

Ships in 3 Business Days

$ 99.99 USD

Add to Wish List

Qty

$ 99.99 USD

Add to Wish List

Replace your cracked or faded tank

Behr Radiator Replacement

For Automatic Vehicles only

T#:591355

Part#: 17117519211

In Stock at Vendor

$ 454.11 USD

Add to Wish List

Qty

$ 454.11 USD

Add to Wish List

Replace your faulty or worn radiator with this factory replacement

Coolant Hose

For vehicles with production date up to 09/2003

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:379702

Part#: 17127508014

Back Ordered

$ 25.99 USD

Add to Wish List

Qty

$ 25.99 USD

Add to Wish List

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

Radiator Support Bracket

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:14122755

Part#: 17117514402

Special Order: No Guaranteed ETA

$ 8.99 USD

Add to Wish List

Qty

$ 8.99 USD

Add to Wish List

Mounts to top of radiator bracket, 2 per vehicle.

OEM Rein Coolant Supply Hose - E65 E66

For vehicles with production date up to 09/2003

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:375745

Part#: 17127508010

Back Ordered

$ 134.99 USD

Add to Wish List

Qty

$ 134.99 USD

Add to Wish List

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.

Rein Coolant Return Pipe - N62 N73

2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat!

T#:386411

Part#: 11511439976

Special Order: No Guaranteed ETA

$ 14.99 USD

Add to Wish List

Qty

$ 14.99 USD

Add to Wish List

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.

Show More Show Less

Select Vehicle

Purpose

Category

Home

Cooling

Brand

View All Brands

Price

Special Offers

On Sale (4)

Shipping