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BMW Cooling System Parts & Accessories for BMW 5 Series E34 (1987-1995)

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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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Meyle Radiator Fan Clutch - E12, E24, E28, E30, E34, E36, Z3 ...

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T#:384584

Part#: 11521723918

In Stock

$ 108.99

This product was last offered at the strikethrough price on
06-22-2026

$ 93.99 USD

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$ 93.99 USD

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Quality aftermarket replacement

Facet Radiator Fan Switch - E24, E28, E30, E31, E32, E34, E36, Z3 ...

T#:375144

Part#: 61311378073

Ships in 2 Business Days

$ 44.99 USD

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$ 44.99 USD

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Measures radiator air temperature enabling the fan to turn off or on

Rein Thermostat - 88ï¿½C - E30, E34, E36, Z3

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T#:591800

Part#: 11537511580

In Stock at Vendor

$ 37.99 USD

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$ 37.99 USD

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Common point of failure in the cooling system.

OEM Rein Throttle Body Return Hose - E34 525i

For vehicles with a production date from 03/1991

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T#:379743

Part#: 11531738054

Ships in 2 Business Days

$ 61.99 USD

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$ 61.99 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.

Rein Radiator Hose - Upper - E32, E34

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T#:6960

Part#: 11531722682

In Stock at Vendor

$ 63.99 USD

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$ 63.99 USD

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BMW ENGINE WATER HOSE 11531722682.--

This item fits the following BMWs:
BMW 5 Series -535i
BMW 7 Series - 735i, 735iL

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Fan Blade

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T#:594536

Part#: 11521723363

Ships on Oct 30, 2026

$ 32.99 USD

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$ 32.99 USD

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This fan is driven by the 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 peices. Be sure to get a new fan clutch, while you are replacing this.

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Water Pump

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T#:582577

Part#: 11519070761

Ships on Oct 30, 2026

$ 55.99 USD

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$ 55.99 USD

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

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T#:591319

Part#: 11527502804

In Stock

$ 101.99 USD

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$ 101.99 USD

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OEM replacement

Sachs Radiator Fan Clutch - E34, E36, E39, E46, E53, Z3

T#:591739

Part#: 11527505302

Back Ordered

$ 231.08 USD

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$ 231.08 USD

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Common source of engine overheating

Coolant Temperature Sender

T#:586992

Part#: 12621747281

Ships in 2 Business Days

$ 23.99

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

$ 19.99 USD

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$ 19.99 USD

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Water Pump to Thermostat Cooling Hose - E30 E34 E28

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T#:6917

Part#: 11531287651

In Stock

$ 10.99 USD

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$ 10.99 USD

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Replace your cracked or leaking coolant hose with this radiator coolant hose that goes from the waterpump to the thermostat on cars with the M20 engine. We recommend inspecting cooling system hoses for dry rot / cracks yearly.

This item fits the following BMWs:
1984-1991 E30 BMW 325e 325es 325i 325ic 325is 325ix
1982-1988 E28 BMW 528e
1989-1990 E34 BMW 525i

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Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...

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T#:19431

Part#: 17121712736

In Stock

$ 13.99 USD

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$ 13.99 USD

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VENT HOSE 17121712736 Manufactured by CRP

Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...

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T#:591144

Part#: 11531265084

Ships in 4 Business Days

$ 2.99 USD

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Qty

$ 2.99 USD

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This O-ring seals the thermostat to the cylinder head.

Meyle Expansion Tank Cap

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T#:579357

Part#: 3148009004

In Stock

Sale - Save 40% $ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Qty

Sale - Save 40%

$ 14.99

This product was last offered at the strikethrough price on
05-15-2026

$ 8.99 USD

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Replace worn or missing pieces.

Rein Water Pump O-Ring (Small) - E32, E34, E38, E39

2X Entries Into Our F80 M3 Sweepstakes

T#:379680

Part#: 11531710055

In Stock

$ 2.03 USD

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Qty

$ 2.03 USD

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When it comes time to replace the water pump, be sure to replace all the O-Rings associated with it to ensure that your car stays leak free. If you are experiencing leaking issues, be sure to inspect these rings, as they might have worn down. This specific ring is used when replacing water pump on cooling pipe to the water accumulator. There are two per car.

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Rein Coolant Bleeder Screw CHW1575 - Priced Each

2X Entries Into Our F80 M3 Sweepstakes

T#:591955

Part#: 17111712788

In Stock

$ 4.99 USD

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$ 4.99 USD

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Coolant Bleeder Screw is a critical component for maintaining your BMW’s cooling system. Designed to release trapped air from the coolant lines, this screw ensures efficient coolant flow and prevents overheating. Specifically engineered for BMW models, it enhances the overall performance and longevity of your engine by maintaining proper temperature regulation. Comes with O-Ring.

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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...

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T#:340541

Part#: 17111742231

Ships in 8 Business Days

$ 17.99 USD

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$ 17.99 USD

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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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Coolant Thermostat - Includes Sealing Gasket

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T#:54852031

Part#: 028 280 0004

In Stock

$ 11.99 USD

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Qty

$ 11.99 USD

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This Meyle-Original replacement thermostat is a direct-fit solution designed to maintain a rock-solid, factory-correct 80°C operating temperature.

OEM Rein Coolant Hose - E32 E34

For vehicles with production date from 03/1995

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T#:6970

Part#: 11531741405

Ships in 2 Business Days

$ 14.99 USD

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Qty

$ 14.99 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.

This item fits the following BMWs:
BMW 5 Series - 530i, 530i wagon /540i
BMW 7 Series - 740i, 740iL

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Coolant Temperature Sender - 2 Pin

For vehicles with production date from 09/1992

T#:379619

Part#: 12621747281

Ships in 4 Business Days

$ 8.99 USD

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Qty

$ 8.99 USD

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Meistersatz Water Temperature Sensor - E31, E32, E34, E38

Located in the water accumilator Located in the thermostat housing. For vehicles with electronic engine-power requlation

T#:379615

Part#: 12621288158

Ships in 4 Business Days

$ 7.99 USD

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Qty

$ 7.99 USD

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M14x1.5 Thread

Rein Expansion Tank Cap - E30, E34

2X Entries Into Our F80 M3 Sweepstakes

T#:592018

Part#: 17137639023

Ships in 4 Business Days

$ 14.99 USD

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Qty

$ 14.99 USD

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1.4 Bar pressure

OEM Rein Coolant Hose - E34 525i M20

2X Entries Into Our F80 M3 Sweepstakes

T#:6955

Part#: 11531720678

Ships in 2 Business Days

$ 11.99 USD

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Qty

$ 11.99 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.

This item fits the following BMWs:
BMW 5 Series - 525i, 525i Wagon

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Rein Coolant Hose - E28, E30, E34

2X Entries Into Our F80 M3 Sweepstakes

T#:379671

Part#: 13541719966

Ships in 2 Business Days

$ 6.11 USD

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Qty

$ 6.11 USD

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Thermostat to throttle housing

Rein Water Hose (Right Outlet) - E32 E34

Also use- (Qty.) (1) 17 21 1 723 943 O-Ring. ¦ Right

2X Entries Into Our F80 M3 Sweepstakes

T#:593082

Part#: 17221728944

Ships in 4 Business Days

$ 28.99 USD

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Qty

$ 28.99 USD

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Transmission Oil Cooler to Water Manifold

OEM Rein Lower Radiator Hose - E34 525i

2X Entries Into Our F80 M3 Sweepstakes

T#:6962

Part#: 11531722852

Ships in 2 Business Days

$ 12.99 USD

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$ 12.99 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.

Rein Thermostat 80C - E30 325e, E28 535i, E24 633CSi

2X Entries Into Our F80 M3 Sweepstakes

T#:34114243

Part#: 11531710953

In Stock

$ 19.99 USD

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Qty

$ 19.99 USD

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Thermostat 80C is a crucial component for controlling the temperature in BMW engines, ensuring optimal performance and protection. Designed to open at 80°C, this thermostat helps your engine reach its ideal operating temperature quickly while preventing overheating. Engineered specifically for BMW vehicles, the Thermostat 80C ensures precise temperature regulation, enhancing both engine efficiency and longevity. Available at Turner Motorsport, this direct-fit replacement offers easy installation and reliable performance.

Designed for BMW engines for a perfect fit
Opens at 80°C to regulate coolant flow and maintain optimal temperature
Prevents overheating and improves engine efficiency
Manufactured from high-quality, durable materials for long-lasting use
Direct-fit replacement ensures hassle-free installation
Enhances overall engine performance and longevity

The Thermostat 80C from Turner Motorsport is the perfect choice for BMW owners looking to maintain optimal engine temperature, ensuring smooth operation and extending the life of their vehicle.

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Coolant Expansion Tank With Cap - 17111712835

2X Entries Into Our F80 M3 Sweepstakes

T#:46616014

Part#: EPK0012

Back Ordered

$ 29.99 USD

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$ 29.99 USD

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The coolant expansion tank provides a place for excess fluid as coolant expands and contracts with temperature changes. Constant exposure to these extremes can cause the tank to crack, break, or suffer damage to its nipples or mounting points. To keep your cooling system sealed and functioning properly, any damaged tank should be replaced.

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Rein Heater Hose - E32, E34

2X Entries Into Our F80 M3 Sweepstakes

T#:20514

Part#: 64211390935

Back Ordered

$ 12.99 USD

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Qty

$ 12.99 USD

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HOSE F WATER VALVE AND LEFT 64211390935 Manufactured by CRP

Meyle Expansion Tank Cap

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T#:5958735

Part#: 17111742232

Back Ordered

$ 10.99 USD

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$ 10.99 USD

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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. The coolant expansion tank cap keeps necessary pressure on your coolant to increase efficiency. If you have an overheating issue in your vehicle, a simple, quick, and inexpensive part to replace is this cap. Often times, the coolant is not kept under enough pressure to keep it from boiling or expanding too much. This cap keeps all the heat and liquid inside the coolant system for maximum efficiency. Should be replaced each time major coolant system service is performed.

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