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BMW Cooling System Parts & Accessories for BMW 3 Series E30 (1984-1991)

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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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Genuine BMW Thermostat Housing - E36 318i 318is 318ti M42 1.8L ...

T#:13004

Part#: 11531721966

Ships in 3 Business Days

Sale - Save 8% $ 110.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 102.55 USD

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$ 110.99

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

$ 102.55 USD

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Genuine BMW Connection Flange -
This item fits the following BMW Chassis:
E30,E36

Fits BMW Engines including:
M42

Coolant Expansion Tank - E30 325e 325i thru 1987 528e thru 88 ...

T#:2061

Part#: 17111707540

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Sale - Save 8% $ 158.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 146.98 USD

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$ 158.99

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

$ 146.98 USD

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This radiator expansion tank (coolant reservoir) is used on E30 325e 325es 325i 325is 325ic from 1984-1987 and E28 528e 1982-1987.

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:
1984-1987 E30 BMW 325e 325es 325i 325is 325ic 325ix
1982-1988 E28 BMW 528e

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Genuine BMW Locking Plug - E30 325e 325es 325i

T#:30617

Part#: 11111285395

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Sale - Save 21% $ 32.99

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$ 26.07 USD

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Sale - Save 21%

$ 32.99

This product was last offered at the strikethrough price on
05-02-2026

$ 26.07 USD

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Genuine BMW Cover Lid -
This item fits the following BMW Chassis:
E30

Fits BMW Engines including:
M20

Genuine BMW Coolant hose - E34 535i

T#:367918

Part#: 17121712736

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Sale - Save 5% $ 76.99

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$ 72.94 USD

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This product was last offered at the strikethrough price on
06-25-2026

$ 72.94 USD

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Genuine BMW Heater Hose - Inlet - E30 M42 1.8L

T#:368719

Part#: 64211386690

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Sale - Save 5% $ 71.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 68.24 USD

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06-25-2026

$ 68.24 USD

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Bav Auto Expansion Tank Cap - E36 E46 E34 E39 E32 E38 E65 X3 X5 Z4 ...

T#:640208

Part#: 17117639022

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Sale - Save 15% $ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 USD

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$ 13.99

This product was last offered at the strikethrough price on
06-03-2026

$ 11.89 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. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty.

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Genuine BMW Engine Water Hose 11531709050

T#:14575

Part#: 11531709050

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Sale - Save 32% $ 39.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 27.22 USD

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$ 39.99

This product was last offered at the strikethrough price on
05-02-2026

$ 27.22 USD

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GENUINE BMW WATER HOSE

Water Hose - E30

T#:20217

Part#: 11531721847

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Sale - Save 7% $ 14.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 13.91 USD

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$ 14.99

This product was last offered at the strikethrough price on
06-25-2026

$ 13.91 USD

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WATER HOSE 11531721847

This item fits the following BMWs:
BMW 3 Series - 318i, 318i Convertible, 318is

--. Fits BMW Engines including:
M42

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