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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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Condor Speed Shop SPAL Fan Relay Wiring Harness - E30, E34, E36 ...

T#:28736800

Part#: CSS-SPAL-RWK

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$ 98.99 USD

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Upgrade your E30 or E36 cooling system effortlessly with the Condor fan relay harness designed specifically for SPAL fans. This harness seamlessly integrates with your existing OEM radiator temperature switch (we recommend the 80/88c E36 sensor), making installation a breeze. Here are the key features of this kit:

Seamless integration with OEM radiator temperature switch Compatibility with SPAL fans for efficient cooling Triggering of the relay when the temperature threshold is met Weatherproof fuse holder for added protection High-temperature wire for reliable performance Durable wire sleeving resistant to abrasion, chemicals, and UV rays Two easy-to-install options for connecting to the BMW radiator temperature switch, labeled for simplicity Experience consistent and effective fan operation with the Condor fan relay harness, ensuring optimal cooling performance for your vehicle.

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

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T#:591800

Part#: 11537511580

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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

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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

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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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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

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$ 1.95 USD

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

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

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T#:379680

Part#: 11531710055

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$ 1.93 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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OEM Rein Expansion Tank Cap - BMW E32 E34 E36 E38 E39 E46 & More ...

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T#:340541

Part#: 17111742231

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$ 17.09 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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Rein Expansion Tank Hose - E12, E21, E23, E24, E28, E30, E32, E34 ...

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T#:19431

Part#: 17121712736

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$ 13.29 USD

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VENT HOSE 17121712736 Manufactured by CRP

Water Pump to Thermostat Cooling Hose - E30 E34 E28

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T#:6917

Part#: 11531287651

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$ 10.44 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 Coolant Bleeder Screw CHW1575 - Priced Each

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T#:591955

Part#: 17111712788

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$ 3.87 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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Rein Water Hose (Right Outlet) - E32 E34

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

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T#:593082

Part#: 17221728944

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Transmission Oil Cooler to Water Manifold

OEM Rein Coolant Hose - E34 525i M20

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T#:6955

Part#: 11531720678

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$ 11.39 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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OEM Rein Lower Radiator Hose - E34 525i

2X Entries Into Our F80 M3 Sweepstakes

T#:6962

Part#: 11531722852

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$ 12.34 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 Coolant Hose - E28, E30, E34

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T#:379671

Part#: 13541719966

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$ 5.80 USD

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Thermostat to throttle housing

OEM Rein Coolant Hose - E32 E34

For vehicles with production date from 03/1995

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T#:6970

Part#: 11531741405

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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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Rein Expansion Tank Cap - E30, E34

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T#:592018

Part#: 17137639023

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1.4 Bar pressure

Coolant Expansion Tank With Cap - 17111712835

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T#:46616014

Part#: EPK0012

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$ 27.65 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

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HOSE F WATER VALVE AND LEFT 64211390935 Manufactured by CRP

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

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T#:34114243

Part#: 11531710953

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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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