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BMW Cooling System Parts & Accessories for BMW 5 Series E39 (1996-2003)

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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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Hose Clamp - 40mm-60mm

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T#:5227

Part#: 040-60T

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$ 3.99 USD

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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.

Features:

9mm band width

6mm hex & slotted head

Smooth inside of band = optimal hose protection

OEM

430 Stainless steel band and housing with zinc plated steel screw

Asymmetric housing = even distribution of forces and prevents tilting of the clamp when tightening

Screw support = ease of assembly due to the safe guidance of the emerging band

Short housing saddle = even contact pressure = improved efficiency

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Radiator Fan Clutch

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T#:56507828

Part#: 11527502804

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$ 85.99 USD

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$ 85.99 USD

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Victor Reinz Water Pump Gasket - E31, E32, E34, E38, E39, E53 ...

T#:376106

Part#: 11511731372

Ships in 7 Business Days

$ 7.99

This product was last offered at the strikethrough price on
07-23-2026

$ 7.13 USD

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$ 7.13 USD

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Should be replaced each time the water pump is removed

Lower Water Valve Bracket - E39

T#:71313

Part#: 41148200043

Ships in 7 Business Days

6% off MSRP $ 17.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 16.99 USD

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6% off MSRP

$ 17.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 16.99 USD

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Genuine BMW Lower Water Valve/Add.Water Pump Bracket
This item fits the following BMW Chassis:
E39 M5,E39

Thermostat With Housing - 105C

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T#:15511816

Part#: 11531436386

Ships in 9 Business Days

Sale - Save 4% $ 30.99

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

$ 29.67 USD

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$ 30.99

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

$ 29.67 USD

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A thermostat that opens sooner promotes better cooling in your vehicle. Running a lower temperature thermostat will keep everything much cooler. Keeping the engine cooler will help reduce and improve the life of the seals in your engine, saving you time and money, while also help increase engine performance. A tune might be required to gain the most from this modification, as well as to get your car's ECU accustomed to seeing lower temperatures.

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Rein Coolant Overflow Hose

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T#:19458

Part#: 17111427156

Ships on Oct 14, 2026

$ 5.99 USD

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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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Auxiliary Electric Water Pump

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T#:57014181

Part#: 64116913489

Ships on Oct 14, 2026

$ 75.99 USD

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$ 75.99 USD

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Keep your heating and cooling systems performing sharply with a precision-fit replacement built for long-haul reliability.

Rubber Mount

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T#:362393

Part#: 17111737704

Ships on Oct 21, 2026

$ 7.99 USD

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$ 7.99 USD

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Rubber lower mount for your radiator

Water Pipe

T#:57725184

Part#: 11537502525

Ships on Oct 21, 2026

$ 64.99 USD

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$ 64.99 USD

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When you demand dependable thermal management and uncompromised engine cooling performance, the Burgaflex water pipe delivers.

Electric Auxiliary Fan - E39 1999-2003

For vehicles with production date from 09/1998

We Price Match - Give Us A Call or Chat!

T#:3121418

Part#: 64546921395

Special Order: No Guaranteed ETA

$ 397.99 USD

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$ 397.99 USD

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This electric auxiliary fan for BMW E39 525i 528i 530i 540i M5 1999-2003 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:
1999-2003 E39 BMW 525i 528i 530i 540i M5

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Elring Thermostat Gasket - BMW M60 M62 M70 S70

2X Entries Into Our F80 M3 Sweepstakes

T#:45005599

Part#: 818.437

Special Order: No Guaranteed ETA

$ 2.99 USD

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$ 2.99 USD

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This rubber gasket seals the junction between the thermostat and water pump Measurements: 4.0x76.5mm

Bremmen Engine Fan Blade - 11 Blades, 420mm - BMW M30 S38 M50 M52 S5...

10X Entries Into Our F80 M3 Sweepstakes

T#:640149

Part#: 11521712058

In Stock

Sale - Save 22% $ 23.99

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

$ 18.76 USD

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Sale - Save 22%

$ 23.99

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

$ 18.76 USD

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This fan is driven by the serpentine belt, engaged by the fan clutch. If you have bad motor mounts, it's quite common for the blades of this fan to make contact with the radiator or radiator shroud, essentially self-destructing the fan into many pieces. Be sure to get a new fan clutch, while you are replacing this.

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Febi Coolant Hose - E38, E39

For vehicles with production date up to 09/1998

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T#:381793

Part#: 11531745595

Special Order: No Guaranteed ETA

$ 22.99 USD

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$ 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

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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 Coolant Expansion Tank - E31, E38, E39

We Price Match - Give Us A Call or Chat!

T#:381841

Part#: 17111741167

Special Order: No Guaranteed ETA

$ 90.99 USD

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$ 90.99 USD

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Replace your cracked or faded expansion tank.

Febi Radiator Fan Clutch - E31, E32, E34, E38, E39

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T#:341629

Part#: 11527502804

Special Order: No Guaranteed ETA

$ 109.99 USD

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$ 109.99 USD

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Quality aftermarket replacement

Febi Expansion Tank Hose - E31, E38, E39

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T#:6969

Part#: 11531741404

Special Order: No Guaranteed ETA

$ 22.99 USD

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$ 22.99 USD

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ENGINE WATER HOSE 11531741404

Auxillary Fan Switch

For vehicles with production date from 09/1998

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T#:4934936

Part#: 3148210000

Ships on Oct 14, 2026

$ 18.99 USD

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$ 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 Level Sensor

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T#:594511

Part#: 61318360876

Ships on Oct 14, 2026

$ 27.99 USD

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Monitors the coolant level in the expansion tank. This sensor is critical in keeping tabs of your cooling systems health.

Coolant Temperature Sensor

Located on water pump housing For vehicles with production date from 09/1998

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T#:594615

Part#: 13621703993

Ships on Oct 14, 2026

$ 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 - Engine/Cooling

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T#:40444296

Part#: 11531705224

Ships on Oct 14, 2026

$ 35.99 USD

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$ 35.99 USD

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Over the years and with exposure to extremely hot coolant, the coolant hoses in your vehicle can take a beating. Being made of reinforced rubber, these hoses can fail in a number of ways. Splitting at a hose clamp, swelling, cracking, and breaking are just a few of the ways this hose can leave you stranded. Replace it at the first sign of wear to keep your coolant in your engine. With the proper diameter, bends, and lengths, this is the perfect replacement for any swelled or damaged hose. An easy installation, it's piece of mind the next time you are on a long trip or your morning commute.

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Fluid Level Sensor

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T#:5973204

Part#: 17117546548

Ships on Oct 14, 2026

$ 13.99 USD

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$ 13.99 USD

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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

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Rein Coolant Hose - E39

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T#:379777

Part#: 64218391003

Special Order: No Guaranteed ETA

$ 31.99 USD

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$ 31.99 USD

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Hose that runs from the engine block 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.

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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

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$ 7.99 USD

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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.

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Auxiliary Fan Switch

For vehicles with production date from 09/1998

2X Entries Into Our F80 M3 Sweepstakes

T#:376847

Part#: 13621433077

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$ 10.99 USD

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$ 10.99 USD

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Comes with related o-ring

BMW Coolant Expansion Tank With Cap

2X Entries Into Our F80 M3 Sweepstakes

T#:46616009

Part#: EPK0013

In Stock at Vendor

$ 71.99 USD

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$ 71.99 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. 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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O-Ring - Coolant Pipe - BMW

2X Entries Into Our F80 M3 Sweepstakes

T#:14949060

Part#: 11411304178

Back Ordered

$ 3.99

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

$ 2.99 USD

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$ 2.99 USD

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Over time, o-rings will wear and eventually fail, leading to leaks and other issues. Avoid this by replacing them with new examples!

Bremmen Parts Thermostat Assembly - E38, E39

For vehicles with production date up to 09/1998

10X Entries Into Our F80 M3 Sweepstakes

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

Gates Coolant Hose - E39

T#:596352

Part#: 64218387521

Back Ordered

$ 64.99 USD

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