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BMW Cooling System Parts & Accessories for BMW 5 Series E28 (1982-1988)

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

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T#:41289770

Part#: 11531730470TKT

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06-08-2026

$ 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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Genuine BMW Radiator Cap 1,4Bar - 17112227683 - E30,E30 M3, E28 M5 ...

T#:22513

Part#: 17112227683

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$ 24.57 USD

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Genuine BMW Radiator Cap - 1,4Bar
This item fits the following BMW Chassis:
E30 M3,E30

Fits BMW Engines including:
S14,S38

Genuine BMW Water Hose - Thermostat Housing to Water Connector Pipe -...

T#:6925

Part#: 11531306829

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$ 20.99 USD

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$ 21.99

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

$ 20.99 USD

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GENUINE BMW ENGINE HOSE 11531306829.--

This item fits the following BMWs:
BMW M Series - M5, M6

--. Fits BMW Engines including:
S38

Genuine BMW Radiator Hose - Lower - E23 733i 735i E24 633CSi 635CSi E...

T#:6922

Part#: 11531289859

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Sale - Save 8% $ 39.99

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$ 36.99 USD

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GENUINE BMW ENGINE HOSE 11531289859
Fits BMW Engines including:
M30

Genuine BMW Temperature Sensor - E21 320i E28 524td

T#:40756

Part#: 12631279721

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Sale - Save 8% $ 44.99

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$ 41.46 USD

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Genuine BMW Temperature Switch - 17Cel

Fits BMW Engines including:
M10

Genuine BMW Radiator Fan Clutch

T#:12998

Part#: 11521723918

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Sale - Save 8% $ 317.99

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$ 293.78 USD

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$ 317.99

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Genuine BMW Fan Coupling - F&S

This item fits the following BMW Chassis:
E30,E34,E36

Fits BMW Engines including:
M10,M20,M30,M42,M44,S38

Genuine BMW Coolant hose - E34 535i

T#:367918

Part#: 17121712736

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Sale - Save 8% $ 77.99

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$ 71.66 USD

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

T#:30617

Part#: 11111285395

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$ 26.62 USD

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05-02-2026

$ 26.62 USD

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

Fits BMW Engines including:
M20

Water Pump to Thermostat Cooling Hose - E30 E34 E28

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T#:6917

Part#: 11531287651

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08-31-2026

$ 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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OEM Febi Cylinder Head Coolant Temperature Sensor - BMW E28 524td ...

We Price Match - Give Us A Call or Chat!

T#:38419103

Part#: 13622242184

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Sale - Save 78% $ 10.99

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05-02-2026

$ 2.45 USD

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Measures the temperature of the coolant at the cylinder head

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

Hose - E28

T#:35788

Part#: 11531275398

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Sale - Save 25% $ 40.99

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$ 30.74 USD

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Genuine BMW HOSE

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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08-31-2026

$ 1.95 USD

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$ 2.05

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$ 1.95 USD

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

OEM Rein Radiator Coolant Cap

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T#:38161716

Part#: 92810625703

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$ 11.12 USD

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Rein Automotive OE Quality caps are designed to be direct replacements for OE caps. Rein caps are designed to match or exceed the OE materials used and are produced to the highest standards to ensure long service life. Rein Automotive OE quality caps keep the coolant system at the proper pressure, just like the OE cap.

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OEM Rein Radiator Cap - E21 E24 E10 E12 E23 E28

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T#:7395

Part#: 17111100848

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$ 11.39 USD

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The radiator 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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Rein Coolant Hose - E28, E30, E34

For vehicles with production date from 09/1987

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T#:379671

Part#: 13541719966

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Sale - Save 5% $ 6.11

This product was last offered at the strikethrough price on
08-31-2026

$ 5.80 USD

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$ 6.11

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$ 5.80 USD

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Thermostat to throttle housing

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

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T#:34114243

Part#: 11531710953

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Sale - Save 5% $ 19.99

This product was last offered at the strikethrough price on
08-31-2026

$ 18.99 USD

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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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