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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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Basic Cooling System Service Kit - E34 525i M50 2.5L

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T#:557231

Part#: E34525BCKT

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05-03-2026

$ 235.13 USD

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$ 235.13 USD

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Just like the rest of your vehicle's major systems, the cooling system must also be addressed periodically to ensure proper cooling and component reliability. Plastic and rubber components become brittle and prone to splitting or cracking after long periods of heating and cooling cycles, especially in colder climates! The coolant itself can degrade or become contaminated, leading to potential corrosion or freezing issues. Finally, thermostats and sensors can fail completely, preventing proper cooling and/or coolant temperature readings to become inaccurate.

To make sure you are not left stranded on the side of the road with an overheated engine, we have put together this Basic Cooling System Service kit. This kit contains all of the most-likely-to-fail components, giving you peace of mind knowing your engine will continue to run cool for another 60,000+ miles.

See kit contents below for all included components.

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Thermostat Replacement Kit - E28, E30, E34 M20B25/27

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T#:41289770

Part#: 11531730470TKT

Ships in 4 Business Days

Sale - Save 22% $ 93.99

This product was last offered at the strikethrough price on
06-08-2026

$ 73.38 USD

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Sale - Save 22%

$ 93.99

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$ 73.38 USD

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This BMW Thermostat Replacement Kit is the go-to choice for preserving the performance and reliability of your classic M20-powered BMW—keeping your engine running cool and smooth mile after mile.

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Water Pump - E34 530i 540i E32 740i/il

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T#:338251

Part#: 11510007042X

Ships in 6 Business Days

Starting at $ 470.99 USD

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Starting at $ 470.99 USD

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Don't take your car's cooling system for granted! One of the biggest weak points is the cooling system. Replacing your waterpump will go a long way for keeping your car on the road and operating properly.

This item fits the following BMWs:
1992-1995 E34 BMW 530i 540i
1992-1994 E32 BMW 740i 740ill

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Aluminum Thermostat Housing - E34, E36, Z3

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T#:579865

Part#: 54402

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Sale - Save 22% $ 25.99

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05-03-2026

$ 20.39 USD

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The plastic thermostat cover in your BMW is a known point of failure. Throughout the years of repeated contact with hot coolant, the plastic can crack and cause massive coolant leaks and potential overheating.

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Aluminum Water Pump Pulley - 104MM

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T#:374330

Part#: 11511736910

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Sale - Save 22% $ 32.99

This product was last offered at the strikethrough price on
05-14-2026

$ 25.78 USD

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Direct replacement durable aluminum pulley

Auxilary Water Pump for Heating System - E34 E32

T#:338205

Part#: 64118390063

Ships in 1 day

Starting at $ 304.99 USD

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Starting at $ 304.99 USD

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The auxiliary water pump helps to move coolant through the heating system. Sometime the unit can develop leaks or the pump itself may fail.

When doing any sort of repair or maintenance there is no replacement for genuine factory parts. Turner Motorsport carries the Genuine BMW brand with pride and has the parts you need to complete your next project with confidence.

This item fits the following BMWs:
3/1990-1995 E34 BMW 525i 530i 535i 540i M5
1988-1994 E32 BMW 735i 735il 740i 740il 750il
1990-1999 E31 BMW 840i 840ci 850i 850ci 850csi

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Bremmen Coolant Bleeder Screw - BMW E30 E36 E38 E39 E46 E83 E90 Z4 ...

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T#:640140

Part#: 17111712788

Ships on Jan 11, 2027

Sale - Save 39% $ 3.99

This product was last offered at the strikethrough price on
09-02-2026

$ 2.44 USD

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Plastic bleeder screw for cooling system is used to bleed air that would otherwise create an air pocket and lead to overheating. Includes o-ring seal.

Coolant Level Sensor

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T#:30728984

Part#: 61311378320

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Sale - Save 56% $ 34.99

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05-03-2026

$ 15.29 USD

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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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Replace worn or missing pieces.

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

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T#:640149

Part#: 11521712058

In Stock

Sale - Save 22% $ 23.99

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05-03-2026

$ 18.76 USD

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$ 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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