BMW Cooling System Parts & Accessories for BMW 7 Series E38 (1995-2001)

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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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Rein Coolant Overflow Hose
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:19458
Part#: 17111427156
Ships on Oct 14, 2026
$ 5.99 USD
Free Shipping on orders $49 and up

Rein Coolant Overflow Hose is designed to meet the highest standards of performance and durability for your vehicle's cooling system. This high-quality hose ensures the proper transfer of excess coolant from the engine to the overflow reservoir, preventing overheating and ensuring optimal engine performance. Manufactured from reinforced rubber materials, the Rein Coolant Overflow Hose guarantees long-lasting reliability and precise fitment for various vehicle makes and models. It’s the perfect upgrade or replacement for worn-out hoses in any cooling system.

Available through Turner Motorsport, this coolant overflow hose is rigorously tested to withstand extreme temperatures, pressures, and daily use. If you’re looking to maintain or improve your car's cooling efficiency, the Rein Coolant Overflow Hose is an essential component.

  • Precision engineered for a perfect fit
  • Manufactured from durable, reinforced rubber
  • Designed to withstand high temperatures and pressures
  • Improves cooling system efficiency and prevents overheating
  • Easy installation with OE-spec dimensions
  • Available at Turner Motorsport, trusted for automotive parts

Enhance your vehicle's performance and reliability by replacing your old coolant hose with the Rein Coolant Overflow Hose today.

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CTA Tools - Corporate Logo
T#:641679
Part#: CTAA195
In Stock
$ 9.98 USD
Free Shipping on orders $49 and up
Tests all ethylene glycol solutions with radiator hot or cold
FAE - Corporate Logo
T#:7171
Part#: 12621288158
Ships on Oct 21, 2026
$ 16.99 USD
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$ 16.99 USD
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ENGINE ELECTRICAL TEMPERATURE SENSOR, WATER 12621288158

Rubber Mount
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:362393
Part#: 17111737704
Ships on Oct 21, 2026
$ 7.99 USD
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Rubber lower mount for your radiator

Electric Auxiliary Fan - E38 1999-2001, Z8
For vehicles with production date from 09/1998
We Price Match - Give Us A Call or Chat!
VDO - Corporate Logo
T#:3121420
Part#: 64546921383
Special Order: No Guaranteed ETA
$ 563.99 USD
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$ 563.99 USD
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This electric auxiliary fan for BMW E38 7 series 1999-2001 and BMW Z8, mounts in front of the radiator and is designed to push air through the A/C Condenser and main radiator. It provides additional cooling for when the car is in traffic. It is a common failure item. If your engine temps are creeping up or if your A/C isn't blowing cold this could be the cause.

This item fits the following BMWs:
1999-2001 E38 BMW 740i 740il 750il
2000-2003 E52 BMW Z8 Roadster
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Elring Thermostat Gasket - BMW M60 M62 M70 S70
2X Entries Into Our F80 M3 Sweepstakes
Elring - Corporate Logo
T#:45005599
Part#: 818.437
Special Order: No Guaranteed ETA
$ 2.99 USD
Free Shipping on orders $49 and up
This rubber gasket seals the junction between the thermostat and water pump Measurements: 4.0x76.5mm

2 Pin Connector
10X Entries Into Our F80 M3 Sweepstakes
ECS - Corporate Logo
T#:33412932
Part#: 61132359999
In Stock
Sale - Save 25% $ 10.99

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

$ 8.24 USD
Free Shipping on orders $49 and up
Sale - Save 25%
$ 10.99

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

$ 8.24 USD
Free Shipping on orders $49 and up

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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Febi Coolant Hose - E38, E39
For vehicles with production date up to 09/1998
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:381793
Part#: 11531745595
Special Order: No Guaranteed ETA
$ 22.99 USD
Free Shipping on orders $49 and up
$ 22.99 USD
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Replacement upper radiator hose. This is an OEM BMW replacement hose.

This item fits the following BMWs:  
1997-1998  E39 BMW  540i 
1996-1998  E38 BMW  740i 740il 
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Febi Radiator Hose - Lower - E38, E39
For vehicles with production date up to 09/1998
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:382399
Part#: 11531741409
Special Order: No Guaranteed ETA
$ 22.99 USD
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$ 22.99 USD
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Replacement lower radiator hose. This is an OEM BMW replacement hose. 

This item fits the following BMWs:    
1997-1998   E39 BMW   540i  
1996-1998   E38 BMW   740i 740il 
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Febi Expansion Tank Hose - E31, E38, E39
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:6969
Part#: 11531741404
Special Order: No Guaranteed ETA
$ 22.99 USD
Free Shipping on orders $49 and up
ENGINE WATER HOSE 11531741404
Coolant Level Sensor
5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:594511
Part#: 61318360876
Ships on Oct 14, 2026
$ 27.99 USD
Free Shipping on orders $49 and up
Monitors the coolant level in the expansion tank. This sensor is critical in keeping tabs of your cooling systems health.
Auxillary Fan Switch
5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!
Meyle - Corporate Logo
T#:4934936
Part#: 3148210000
Ships on Oct 14, 2026
$ 18.99 USD
Free Shipping on orders $49 and up
$ 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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Coolant Temperature Sensor
Located on water pump housing
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Meyle - Corporate Logo
T#:594615
Part#: 13621703993
Ships on Oct 14, 2026
$ 18.99 USD
Free Shipping on orders $49 and up
$ 18.99 USD
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This is the coolant temperature sensor used in many BMW models from the mid-1990s to the mid-2000s. 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.

This coolant temp sensor fits the following BMWs:
1996-1999 E36 BMW 323is 323ic 328i 328is 328ic M3, located in cylinder head
1999-2003 E39 BMW 540i, located on side of water pump
1999-2001 E38 BMW 740i 740il, located on side of water pump
1995-1996 E38 BMW 750il, located on side of water pump
1990-1999 E31 BMW 850i 850ci, located on side of water pump
2000-2006 E53 BMW X5 3.0i, located in cylinder head
2000-2006 E53 BMW X5 4.4i/4.6is/4.8is, located on side of water pump
1997-2002 Z3 BMW Z3 2.5i Z3 3.0i, located in cylinder head
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BMW Coolant Expansion Tank With Cap
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:46616009
Part#: EPK0013
In Stock at Vendor
$ 71.99 USD
Free Shipping on orders $49 and up
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. This replacement will fit perfectly and provide the same heating and cooling characteristics as an original unit. When replacing, be sure to have some extra coolant. Check ECS Tuning's website for a wide variety of coolants specifically designed for your car. Most German vehicles require specialized coolant. Be sure to pick up the proper coolant when refilling to avoid damage or premature corrosion.
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Expansion Tank Hose
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379785
Part#: 17111737819
Back Ordered
$ 26.99 USD
Free Shipping on orders $49 and up
Connects the expansion tank to the radiator

OEM Radiator Water Valve Hose - Left - E38 740
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:11094
Part#: 64218391122
Back Ordered
$ 6.54 USD
Free Shipping on orders $49 and up

This is the hose that runs from the left radiator to the water valve. 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: 
1999-2001 E38 BMW 740i 740il

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Febi Coolant Temperature Sender - E31, E32, E34, E36, E38
Located in the water accumulator Located in the cylinder head
We Price Match - Give Us A Call or Chat!
Febi - Corporate Logo
T#:382428
Part#: 12621747281
In Stock
$ 20.99 USD
Free Shipping on orders $49 and up
$ 20.99 USD
Free Shipping on orders $49 and up
2 pin
Auxiliary Fan Switch
2X Entries Into Our F80 M3 Sweepstakes
URO - Corporate Logo
T#:376847
Part#: 13621433077
Back Ordered
$ 10.99 USD
Free Shipping on orders $49 and up
$ 10.99 USD
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Comes with related o-ring

Bremmen Parts Thermostat Assembly - E38, E39
For vehicles with production date up to 09/1998
10X Entries Into Our F80 M3 Sweepstakes
Bremmen Parts - Corporate Logo
T#:388457
Part#: 11531437526
Back Ordered
$ 64.99 USD
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$ 64.99 USD
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Comes with aluminum housing, o-ring & sensor