Home
Cooling

BMW Cooling System Parts & Accessories for BMW X Series E53 (2000-2006)

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:

2 Pin Connector

10X Entries Into Our F80 M3 Sweepstakes

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

Add to Wish List

Qty

Sale - Save 25%

$ 10.99

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

$ 8.24 USD

Add to Wish List

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

Show More Show Less

Thermostat With Housing & Gasket

T#:56544033

Part#: 11537586885

Special Order: No Guaranteed ETA

$ 68.99 USD

Add to Wish List

Qty

$ 68.99 USD

Add to Wish List

This Febi Bilstein electronic coolant thermostat assembly delivers factory-level thermal control to keep coolant temperatures stable across varying engine loads.

BMW Coolant Flange

We Price Match - Give Us A Call or Chat!

T#:17339424

Part#: 17107500745

Special Order: No Guaranteed ETA

$ 30.99 USD

Add to Wish List

Qty

$ 30.99 USD

Add to Wish List

The piece connects the cooling hoses to the expansion tank. Usually broken when trying to remove the hoses from the connections.

Coolant Temperature Sensor

Located on water pump housing

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:594615

Part#: 13621703993

Ships on Sep 23, 2026

$ 18.99 USD

Add to Wish List

Qty

$ 18.99 USD

Add to Wish List

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

Show More Show Less

Fluid Level Sensor

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:5973204

Part#: 17117546548

Ships on Sep 23, 2026

$ 13.99 USD

Add to Wish List

Qty

$ 13.99 USD

Add to Wish List

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

Show More Show Less

Auxillary Fan Switch

5X Entries Into Our F80 M3 Sweepstakes
We Price Match - Give Us A Call or Chat!

T#:4934936

Part#: 3148210000

Ships on Sep 23, 2026

$ 18.99 USD

Add to Wish List

Qty

$ 18.99 USD

Add to Wish List

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

Show More Show Less

Meyle Engine Coolant Thermostat - BMW FXX, GXX

5X Entries Into Our F80 M3 Sweepstakes

T#:52797701

Part#: 3282280016

Ships on Sep 23, 2026

$ 47.99 USD

Add to Wish List

Qty

$ 47.99 USD

Add to Wish List

This MEYLE thermostat ensures your engine stays at the perfect temperature for efficiency and power.

Rein Coolant Return Pipe - N62 N73

2X Entries Into Our F80 M3 Sweepstakes

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

Add to Wish List

Qty

Sale - Save 11%

$ 14.99

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

$ 13.29 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

URO Air Temperature Sensor - BMW X5 M5 525i 528i 530i 540i

2X Entries Into Our F80 M3 Sweepstakes

T#:592644

Part#: 64118391392

Back Ordered

$ 7.99 USD

Add to Wish List

Qty

$ 7.99 USD

Add to Wish List

URO Parts is one of the leading manufacturers of high quality direct replacement aftermarket components, covering a wide range of makes and models. All of their replacement parts are manufactured to ISO 9000 certification standards, so you can expect long lasting performance from URO Parts.

Show More Show Less

URO Expansion Tank Hose - E53

2X Entries Into Our F80 M3 Sweepstakes

T#:45278651

Part#: 11537500735

Back Ordered

$ 23.99 USD

Add to Wish List

Qty

$ 23.99 USD

Add to Wish List

A reliable, affordable solution for maintaining cooling system integrity and long-term engine health.

Spirolox Clip

2X Entries Into Our F80 M3 Sweepstakes

T#:55821687

Part#: 111414399753

Ships in 1 Business Day

$ 9.99 USD

Add to Wish List

Qty

$ 9.99 USD

Add to Wish List

The ÜRO Parts Spirolox Clip provides the heavy-duty reliability your European vehicle demands, eliminating the structural weak links caused by fatigued or distorted factory hardware.

BMW Oil Cooler

We Price Match - Give Us A Call or Chat!

T#:38385318

Part#: 17101439112

Special Order: No Guaranteed ETA

$ 87.99 USD

Add to Wish List

Qty

$ 87.99 USD

Add to Wish List

The heat exchanger regulates engine oil temperature to prevent overheating, reducing the risk of oil breakdown and potential internal engine damage.

Bremmen Parts Auxiliary Water Pump Hose - E53

10X Entries Into Our F80 M3 Sweepstakes

T#:1195928

Part#: 11537505949

Back Ordered

Sale - Save 3% $ 110.15

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

$ 106.85 USD

Add to Wish List

Qty

Sale - Save 3%

$ 110.15

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

$ 106.85 USD

Add to Wish List

Used for the additional water pump

Radiator Mount

2X Entries Into Our F80 M3 Sweepstakes

T#:56977984

Part#: 17117514402

Back Ordered

$ 6.99 USD

Add to Wish List

Qty

$ 6.99 USD

Add to Wish List

Maintain cooling system stability under spirited street driving and hard track use with this URO Parts replacement upper radiator mount bracket.

Auxiliary Fan Switch

2X Entries Into Our F80 M3 Sweepstakes

T#:376847

Part#: 13621433077

Ships in 1 Business Day

$ 10.99 USD

Add to Wish List

Qty

$ 10.99 USD

Add to Wish List

Comes with related o-ring

Radiator Support Bracket

2X Entries Into Our F80 M3 Sweepstakes

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

Add to Wish List

Qty

Sale - Save 13%

$ 8.99

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

$ 7.83 USD

Add to Wish List

Mounts to top of radiator bracket, 2 per vehicle.

1
…
6
7

Select Vehicle

Purpose

Category

Home

Cooling

Brand

View All Brands

Price

Special Offers

Shipping