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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Turner Motorsport - Corporate Logo
T#:338927
Part#: HOSE-CLAMPS
In Stock
Sale - Save 3% $ 3.99

This product was last offered at the strikethrough price on
06-13-2026

Starting at $ 3.87 USD
Free Shipping on orders $49 and up
Sale - Save 3%
$ 3.99

This product was last offered at the strikethrough price on
06-13-2026

Starting at $ 3.87 USD
Free Shipping on orders $49 and up
Hose clamps for radiator hoses, coolant hoses, vacuum hoses, or intake hoses. These hose clamps are the same style as your OEM hoses with a smooth inside band to prevent cutting into the hose material.
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Water Pump
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URO - Corporate Logo
T#:378572
Part#: 11517586781
Ships in 1 Business Day
$ 107.99 USD
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$ 107.99 USD
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Includes required sealing gaskets and o-ring
Rein Radiator Hose - Upper - E65, E66
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Rein - Corporate Logo
T#:379749
Part#: 17127535742
Ships in 3 Business Days
$ 89.99 USD
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$ 89.99 USD
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A common source of cooling system failure

Expansion Tank
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URO - Corporate Logo
T#:377312
Part#: 17137543003
Back Ordered
$ 56.99 USD
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The coolant expansion tank in your vehicle gives additional fluid a place to go after expansion and contraction from temperature change. Because it is subjected to such drastic changes on a regular basis, it can often crack or break. You want to keep all the coolant in your vehicle in the cooling system. If your tank has experienced damage such as cracking, nipples breaking off, or mounting point damage, you will need to replace it.
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MMX Performance - Corporate Logo
T#:29002094
Part#: MMR03-1502
Ships in 2 Business Days
$ 127.99 USD
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The MMX Performance 90mm billet coolant expansion cap for BMWs has been designed from the ground up in the UK, from a solid piece of billet aluminum. Each cap was designed to directly replace the OE cap, not merely stuck in place. Fitment is for models with the matching OE (17 11 7 639 021) part number.
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Coolant Hose
For vehicles with production date from 09/2003
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Rein - Corporate Logo
T#:379683
Part#: 17127568246
Ships in 3 Business Days
$ 37.99 USD
Free Shipping on orders $49 and up
$ 37.99 USD
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This is the return hose that attaches from the water pump to the radiator

URO Water Pump w/ Metal Impeller - BMW E65 E66 N62 N73
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URO - Corporate Logo
T#:639154
Part#: 11517586780
Ships in 1 Business Day
$ 115.99 USD
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$ 115.99 USD
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The water pump in your vehicle keeps all that coolant flowing freely. If it begins to fail, overheating problems are inevitable. Don't take a chance on doing damage to engine internals by not replacing your water pump.
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Expansion Tank Vent Hose
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Rein - Corporate Logo
T#:592006
Part#: 17127541146
In Stock at Vendor
$ 36.99 USD
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Replace your leaking hose

Rein Coolant Vent Pipe - E65, E66
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Rein - Corporate Logo
T#:591999
Part#: 17127534527
Ships in 3 Business Days
$ 30.99 USD
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Connects the radiator to the expansion tank

N62 Engine Collapsible Cooling Pipe - E60 E63 E65 E53 E70
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URO - Corporate Logo
T#:338249
Part#: 11141439975R
In Stock
Starting at $ 300.67 USD
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Starting at $ 300.67 USD
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Has your BMW's with the N62 V8 engine developed a coolant leak at the front of the engine from the timing cover weep hole? If so the it is likely that the coolant transfer pipe seal, located below the intake manifold has developed a leak. Normally, replacing the seal on this pipe would require almost 40 hours of labor and involve removing the entire engine from the car, then removing the cylinder heads, and timing covers. With this new collapsible pipe this repair can be accomplished in under 10 hours! This solution will save you or your mechanic from a bunch of headaches and get your V8 back on the road leak free!

With more than 100 years in the industry, Elring is one of the oldest names in the European autoparts segment. Delivering OE-quality you can rest assured the job will be done right the first time. 

video: N62 Cooling Pipe Replacement


Supplement Gasket Kit Parts List

(click to expand)

BMW p/nQtyDescription

115317100481Rear Engine Block O-ring,

115175077171Heat Pipe w O-ring

115175085351Water Pump Gasket

115114399761Valley Pan Pipe Pump

111475072781Valley Pan w Gasket

116175211812Intake Manifold Gasket

071199035962Camshaft Adjuster O-ring

123114399881Alternator Feed Pipe

750il gasket kit deletes 11617521181 and 07119903596 and adds - 8 - 11617537999 profile gaskets



This item fits the following BMWs:
2004-2010 E60 BMW 545i 550i
2004-2010 E63 BMW 645ci 650i
2002-2008 E65 BMW 745i 745li 750i 750li
2004-2006 E53 BMW X5 4.4i X5 4.8is
2007-2013 E70 BMW X5 4.8i xDrive48i

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OEM Rein Coolant Expansion Tank Hose - Lower - BMW E65/66 7 Series ...
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Rein - Corporate Logo
T#:375750
Part#: 17127508015
Back Ordered
$ 29.99 USD
Free Shipping on orders $49 and up
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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Coolant Pipe
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URO - Corporate Logo
T#:27372111
Part#: 11511439976
In Stock
$ 10.99 USD
Free Shipping on orders $49 and up
Maintaining the cooling system in your BMW is essential for preserving the engine's longevity. Ensuring proper function of your cooling system is vital for the prolonged lifespan of your vehicle.


URO Thermostat Gasket - BMW N62 N63 N73 N74
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URO - Corporate Logo
T#:592908
Part#: 11531440192
Ships in 1 Business Day
$ 0.97 USD
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Seals the thermostat to the water pump
URO - Corporate Logo
T#:50031902
Part#: 11537586885
In Stock
New Item
$ 77.88

This product was last offered at the strikethrough price on
03-08-2026

$ 74.99 USD
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$ 74.99 USD
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Provides optimal engine cooling performance.
Auxiliary Fan Switch O-Ring
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URO - Corporate Logo
T#:377077
Part#: 13621433077S
In Stock
$ 0.88 USD
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Now you can just replace the o-ring instead of the whole switch

OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...
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Rein - Corporate Logo
T#:340541
Part#: 17111742231
In Stock
$ 17.99 USD
Free Shipping on orders $49 and up
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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Temperature Sensor
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URO - Corporate Logo
T#:37892090
Part#: 13621433076
In Stock
$ 10.34 USD
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Temperature sensor for monitoring coolant and oil
Rein Cooling O-Ring - E53, E60, E63, E64, E65, E66, E70
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Rein - Corporate Logo
T#:362446
Part#: 11531710048
In Stock
$ 4.07 USD
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Seals the rear of the water transfer pipe to the block

Rein Coolant Expansion Tank - E65, E66
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Rein - Corporate Logo
T#:593077
Part#: 17137647713
Ships in 3 Business Days
$ 99.99 USD
Free Shipping
$ 99.99 USD
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Replace your cracked or faded tank
OEM Rein Coolant Hose w/ Temperature Sensor - BMW E60 E63/E64 E65/E66...
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Rein - Corporate Logo
T#:375746
Part#: 17127508011
In Stock at Vendor
$ 75.99 USD
Free Shipping
$ 75.99 USD
Free Shipping
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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O-Ring Kit
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URO - Corporate Logo
T#:376182
Part#: 111414399752
Ships in 1 Business Day
$ 57.99

This product was last offered at the strikethrough price on
04-29-2026

$ 56.99 USD
Free Shipping on orders $49 and up
$ 56.99 USD
Free Shipping on orders $49 and up
The O-rings necessary for servicing your water pipe

Rein - Corporate Logo
T#:45791754
Part#: 17127508011R
Ships in 3 Business Days
$ 35.99 USD
Free Shipping on orders $49 and up
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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Radiator Rubber Mount
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URO - Corporate Logo
T#:362916
Part#: 17101439113
Ships in 1 Business Day
$ 5.99

This product was last offered at the strikethrough price on
02-03-2026

$ 4.99 USD
Free Shipping on orders $49 and up
$ 4.99 USD
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The mount is used to create a sturdy fit for your radiator and help reduce shock to the unit from uneven roads
Cool Retrun Hose
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Rein - Corporate Logo
T#:379713
Part#: 17127540666
Ships in 3 Business Days
$ 80.99 USD
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$ 80.99 USD
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Connects to the radiator


Expansion Tank Vent Hose
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Rein - Corporate Logo
T#:379672
Part#: 17127508013
Ships in 3 Business Days
$ 60.99 USD
Free Shipping
$ 60.99 USD
Free Shipping
A commonly leaking hose
Radiator Drain Plug
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URO - Corporate Logo
T#:37757236
Part#: 0005000185
Ships in 1 Business Day
$ 3.99 USD
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Rein Coolant Return Pipe - N62 N73
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Rein - Corporate Logo
T#:386411
Part#: 11511439976
Special Order: No Guaranteed ETA
$ 14.99 USD
Free Shipping on orders $49 and up
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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URO - Corporate Logo
T#:376847
Part#: 13621433077
Back Ordered
$ 10.99 USD
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$ 10.99 USD
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Comes with related o-ring

Coolant Hose
For vehicles with production date up to 09/2003
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Rein - Corporate Logo
T#:379702
Part#: 17127508014
Back Ordered
$ 25.99 USD
Free Shipping on orders $49 and up
$ 25.99 USD
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This is the return hose that attaches from the water pump to the radiator
OEM Rein Coolant Supply Hose - E65 E66
For vehicles with production date up to 09/2003
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Rein - Corporate Logo
T#:375745
Part#: 17127508010
Back Ordered
$ 134.99 USD
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$ 134.99 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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Rein - Corporate Logo
T#:14122755
Part#: 17117514402
Special Order: No Guaranteed ETA
$ 8.99 USD
Free Shipping on orders $49 and up
Mounts to top of radiator bracket, 2 per vehicle.