Home
Cooling

BMW Cooling System Parts & Accessories for BMW 6 Series E64 (2004-2010)

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:

Race German Coolant Temperature Sender Adapter - M12x1.5

T#:6827887

Part#: RGCTSAM12

In Stock

$ 35.99 USD

Add to Wish List

Qty

$ 35.99 USD

Add to Wish List

Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for M12x1.5 sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor

Show More Show Less

Race German Coolant Temperature Sender Adapter - 1/8NPT

T#:6827888

Part#: RGCTSA1/8NPT

In Stock

$ 35.99 USD

Add to Wish List

Qty

$ 35.99 USD

Add to Wish List

Race German has devoted themselves to providing quality products for late model BMWs that cover both street and track applications. Race German has now grown their catalog to a wide variety of models and products geared towards keeping your car looking and running nice. For those looking to install an aftermarket coolant temp gauge, Race German has the perfect accessory for you! This adapter is machined out of aluminum and splices into your upper radiator hose. Perfect for use with Race German's E30 temperature gauge but has compatibility with a wire variety of other cars as well! Features: Tapped for 1/8NPT sized sensor 38mm diameter outlets which fit most BMW hoses Includes 2x hose clamps **Does not include temp sensor

Show More Show Less

Expansion Tank Vent Pipe

2X Entries Into Our F80 M3 Sweepstakes

T#:402415

Part#: 17127521775

In Stock at Vendor

$ 28.99 USD

Add to Wish List

Qty

$ 28.99 USD

Add to Wish List

Replace your cracked and leaking hose with this replacement from Rein

BMW N62 N62TU AGA Tools coolant pipe

T#:5663672

Part#: AGA-N62-6061

In Stock

$ 560.99 USD

Add to Wish List

Qty

$ 560.99 USD

Add to Wish List

Replace the factory piece that is prone to failure.

Expansion Tank Vent Hose

For vehicles with production date up to 07/2004

2X Entries Into Our F80 M3 Sweepstakes

T#:591986

Part#: 17127519247

Ships in 3 Business Days

$ 29.99 USD

Add to Wish List

Qty

$ 29.99 USD

Add to Wish List

With quick connect coupling

Rein Coolant Expansion Tank - E60, E61, E63, E64

2X Entries Into Our F80 M3 Sweepstakes

T#:402160

Part#: 17137542986

Ships in 1 Business Day

$ 82.99 USD

Add to Wish List

Qty

$ 82.99 USD

Add to Wish List

Includes fluid level sensor

Rein Upper Radiator Hose - E60, E63, E64

2X Entries Into Our F80 M3 Sweepstakes

T#:592004

Part#: 17127540665

Ships in 1 Business Day

$ 79.99 USD

Add to Wish List

Qty

$ 79.99 USD

Add to Wish List

Connects water pump to radiator

Rein Water Pump Return Hose - E60, E63, E64

2X Entries Into Our F80 M3 Sweepstakes

T#:592005

Part#: 17127540667

In Stock at Vendor

$ 26.99 USD

Add to Wish List

Qty

$ 26.99 USD

Add to Wish List

Hose that pulls water from the water pump and disperses it to your engine

OEM Rein Coolant Expansion Tank Return Hose - E60 E63

2X Entries Into Our F80 M3 Sweepstakes

T#:19545

Part#: 17127545653

Ships in 1 Business Day

$ 53.99

This product was last offered at the strikethrough price on
05-07-2026

$ 52.99 USD

Add to Wish List

Qty

$ 52.99 USD

Add to Wish List

This is the coolant reservoir expansion tank return hose that connects to the bottom of the expansion tank. 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.

This item fits the following BMWs:
2004-2010 E60 BMW 545i 550i
2004-2010 E63 BMW 645ci 650i

Show More Show Less

Coolant Hose

For vehicles with automatic transmission only

2X Entries Into Our F80 M3 Sweepstakes

T#:379793

Part#: 17127534918

In Stock at Vendor

$ 90.99 USD

Add to Wish List

Qty

$ 90.99 USD

Add to Wish List

From water pump to radiator

Upper Radiator Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:377397

Part#: 17127519248

Ships in 3 Business Days

$ 100.99 USD

Add to Wish List

Qty

$ 100.99 USD

Add to Wish List

Attaches to the water pump

Radiator Vent Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:592001

Part#: 17127534917

Ships in 3 Business Days

$ 38.23

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

$ 37.99 USD

Add to Wish List

Qty

$ 37.99 USD

Add to Wish List

Replace your cracked & leaking hose

Coolant Hose

For vehicles with production date from 07/2004

2X Entries Into Our F80 M3 Sweepstakes

T#:393277

Part#: 17127542540

In Stock

$ 51.99

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

$ 42.99 USD

Limited Qty Sale

Add to Wish List

Qty

$ 51.99

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

$ 42.99 USD

Limited Qty Sale

Add to Wish List

Attaches to the vent port on the expansion tank

Rein Expansion Tank Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:384807

Part#: 17117639021

In Stock

$ 16.99 USD

Add to Wish List

Qty

$ 16.99 USD

Add to Wish List

Cap for plastic expansion tank

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

2X Entries Into Our F80 M3 Sweepstakes

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

Coolant Hose

2X Entries Into Our F80 M3 Sweepstakes

T#:591989

Part#: 17127519254

Ships in 3 Business Days

$ 48.48

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

$ 44.99 USD

Add to Wish List

Qty

$ 44.99 USD

Add to Wish List

Attaches to the vent port on the expansion tank

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

2X Entries Into Our F80 M3 Sweepstakes

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

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

2X Entries Into Our F80 M3 Sweepstakes

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

Cool Retrun Hose

2X Entries Into Our F80 M3 Sweepstakes

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

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

Add to Wish List

Qty

Sale - Save 20%

$ 14.99

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

$ 11.99 USD

Add to Wish List

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.

Show More Show Less

Bav Auto Coolant Expansion Tank - E60 E61 E63 E64 M54 N52 N62 ...

10X Entries Into Our F80 M3 Sweepstakes

T#:640491

Part#: 17137542986

Special Order: No Guaranteed ETA

Sale - Save 10% $ 54.99

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

$ 49.49 USD

Add to Wish List

Qty

Sale - Save 10%

$ 54.99

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

$ 49.49 USD

Add to Wish List

This Bav Auto cooling system expansion tank/coolant reservoir is a direct replacement for the factory unit. Replace your cracked or leaking radiator expansion tank today. 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.

Show More Show Less

BMW Expansion Tank With Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:46616010

Part#: EPK0128

Back Ordered

$ 86.99

This product was last offered at the strikethrough price on
04-28-2026

$ 74.99 USD

Add to Wish List

Qty

$ 74.99 USD

Add to Wish List

The coolant expansion tank acts as a reservoir for excess coolant as it expands and contracts with temperature changes. Over time, the constant exposure to extreme heat cycles can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep coolant properly contained within the system, a damaged tank should be replaced promptly.

Show More Show Less

Rein Coolant Return Pipe - N62 N73

2X Entries Into Our F80 M3 Sweepstakes

T#:386411

Part#: 11511439976

Ships in 3 Business Days

$ 14.99

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

$ 13.99 USD

Add to Wish List

Qty

$ 13.99 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 (2)

Shipping