BMW Cooling System Parts & Accessories for BMW 8 Series E31 (1991-1997)

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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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Coolant Expansion Tank
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Rein - Corporate Logo
T#:591959
Part#: 17111741167
Ships in 1 Business Day
$ 69.99 USD
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$ 69.99 USD
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Plastic has a limited lifespan - replace every 80,000 miles
OEM VDO Auxiliary Fan Assembly -- E36 (up to 09/1992), E34 E24 E32 E3...
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Continental - Corporate Logo
T#:371895
Part#: 64541392913
Ships in 1-2 days
$ 258.99

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

$ 251.99 USD
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$ 251.99 USD
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If your vehicle is overheating when stopped or your A/C is not blowing cold, there is a good chance that your electric auxiliary fan is malfunctioning. If this is the case, replace it with a high quality OEM VDO Fan Assembly to prevent overheating and ensure the A/C blows cold.

OEM VDO is one of the largest OE providers in the world, supplying numerous vehicle brands, including BMW, with many of their genuine parts that build the vehicle before they ever reach the car lot. Entrusted by many of the top names in automotives and with their proven history of reliability, it makes all of us here at Turner confident that their line of OEM replacement parts are a perfect option to restore your vehicle's original operation and performance. The same great quality or higher than Genuine BMW parts at a lower cost.

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!

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Rein Expansion Tank Hose - E31, E38, E39
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Rein - Corporate Logo
T#:375756
Part#: 11531741404
In Stock
$ 8.45 USD
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Connects the expansion tank to the radiator

Rein Coolant Bleeder Screw CHW1575 - Priced Each
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Rein - Corporate Logo
T#:591955
Part#: 17111712788
In Stock
$ 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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Rein - Corporate Logo
T#:340541
Part#: 17111742231
In Stock
$ 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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BMW Coolant Expansion Tank With Cap
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Rein - Corporate Logo
T#:46616009
Part#: EPK0013
Ships in 3 Business Days
$ 64.99 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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