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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Performance Water Pump & Thermostat Kit - BMW M50 M52
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Packaged by Turner - Corporate Logo
T#:30397440
Part#: 11517527799KT2
In Stock
$ 357.99

This product was last offered at the strikethrough price on
06-15-2026

$ 343.99 USD
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$ 343.99 USD
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BMW vehicles are known for their robust performance, but the water pump is a notorious weak spot, often needing replacement every 60,000 miles.

During this service, it's wise to also swap out the thermostat to maintain the efficiency of your vehicle's cooling system. Turner Motorsport simplifies this process with our expertly curated Water Pump & Thermostat Replacement Kit.

This premium kit centers around the renowned EMP Stewart high-performance water pump--a favorite among BMW enthusiasts for its exceptional design. Featuring a stainless steel impeller, this pump enhances coolant flow by 20%. Complementing this is a low-temperature 68°C (154.4°F) Mishimoto thermostat, an upgraded aluminum thermostat housing, and Redline Water Wetter coolant additive. Together, these components make for the ultimate cooling system upgrade for your E36, E39, or Z3!

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Thermostat Replacement Kit - E28, E30, E34 M20B25/27
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Packaged by Turner - Corporate Logo
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

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

$ 73.38 USD
Free Shipping on orders $49 and up
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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Bosch - Corporate Logo
T#:7259
Part#: 13621709967
In Stock
$ 24.23 USD
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$ 24.23 USD
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To make sure your temperature readings are as accurate as possible, replace your temperature sensor with a high quality OEM Bosch temperature sensor.

OEM replacement for BMW part # 13621709967, 13621709966, and 13621284397. Bosch coolant temperature sensor mounted in the cylinder head on models with the M42, M50 and S50 engines.

Bosch is one of the largest OEM producers of Genuine BMW and aftermarket parts in the world, providing parts for almost every major automotive manufacturer. Bosch has likely supplied many of the original electrical (and mechanical) parts for your BMW. Thanks to their quality, high durability, and reliability, you should expect a long service life from Bosch products.

As a leading source of high performance BMW parts and accessories since 1993, we at Turner Motorsport are honored to be the go-to supplier for tens of thousands of enthusiasts the world over. With over two decades of parts, service, and racing experience under our belt, we provide only quality performance and replacement parts.  All of our performance parts are those we would (and do!) install and run on our own cars, as well as replacement parts that are Genuine BMW or from OEM manufacturers. We only offer parts we know you can trust to perform!


This item fits the following BMWs:
1988-1991 E30 BMW 318i 318is 318ic M3
1992-1995 E36 BMW 318i 318is 318ti 318ic 325i 325is 325ic M3
3/1987-1988 E28 BMW 528e
1985-1988 E28 BMW535i 535is M5
1989-1995 E34 BMW 525i 535i M5
1985-1989 E24 BMW 635csi M6
1984-1987 E23 BMW 735i
1988-1992 E32 BMW 735i 735il

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Mahle - Corporate Logo
T#:341209
Part#: 11537835558
Ships in 2 Business Days
$ 74.00

This product was last offered at the strikethrough price on
06-05-2026

$ 61.49 USD
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$ 61.49 USD
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Includes sealing o-ring

Facet - Corporate Logo
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
Mahle - Corporate Logo
T#:12476
Part#: 11537511083
In Stock
$ 30.99 USD
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$ 30.99 USD
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OEM BMW THERMOSTAT:115040

Mahle - Corporate Logo
T#:594727
Part#: 11531713040
Ships on Oct 26, 2026
$ 35.99 USD
Free Shipping on orders $49 and up
The thermostat on your vehicle controls the flow of coolant based on temperature. When you just start your engine, the thermostat remains closed to accelerate the warm up process. After a few minutes, it opens up to allow the warm fluid to flow. If your vehicle is overheating but not blowing warm air from the heater, the problem is more than likely your thermostat.
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Fan Blade
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Meyle - Corporate Logo
T#:594536
Part#: 11521723363
Ships on Oct 30, 2026
$ 32.99 USD
Free Shipping on orders $49 and up
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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Meyle - Corporate Logo
T#:582577
Part#: 11519070761
Ships on Oct 30, 2026
$ 55.99 USD
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Meyle Radiator Fan Clutch - E31, E32, E34, E38, E39
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Meyle - Corporate Logo
T#:591319
Part#: 11527502804
In Stock
$ 101.99 USD
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OEM replacement
Facet - Corporate Logo
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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Meyle Expansion Tank Cap
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Meyle - Corporate Logo
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
Free Shipping on orders $49 and up
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.


Coolant Thermostat - Includes Sealing Gasket
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Meyle - Corporate Logo
T#:54852031
Part#: 028 280 0004
In Stock
New Item
$ 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.
Meyle Expansion Tank Cap
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Meyle - Corporate Logo
T#:5958735
Part#: 17111742232
Back Ordered
$ 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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