BMW Thermostats for BMW 5 Series E34 (1987-1995)

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BMW thermostats are known to fail, but luckily they typically fail wide open - meaning that your car can still cool. We offer thermostats from various OE suppliers we trust along with upgraded motorsport specific thermostats where applicable to make sure your BMW stays cool on track.

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

10X Entries Into Our F80 M3 Sweepstakes

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

Add to Wish List

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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Aluminum Thermostat Housing Kit - M50

T#:397222

Part#: 14-009

Ships on Oct 23, 2026

$ 56.99 USD

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$ 56.99 USD

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Plastic thermostat housing cracked on your M50?

Here are your choices: you can wait for the plastic factory thermostat housing cover to break and cause major overheating. (Even with a new stock cover, it won’t take long.) Or you can install a thoughtfully engineered all-aluminum thermostat housing cover from Active Autowerke and never experience this type of failure again. Currently there is no factory upgraded part to this problem. This is an aluminum extruded part that has all of the openings machine properly to fit like factory; from the mounting bolt holes, the seating of the thermostat to the sealing opening for the ORANGE gasket. Forged to exact factory tolerances, everything fits and this unit is a true easy bolt-on – especially suited for racing or load conditions like heavy traffic, where engine temp can rise rapidly. The housing is guaranteed never to break from overheating or over-tightening, and its CNC machined surface ensures a precise seat.

Unit comes complete with a new ORANGE sealing gasket; a new thermostat is recommended but not included.
For hotter climates, a 71 degree thermostat is recommended over the 82 degree unit.

Anything and everything BMW is the mantra at Active Autowerke. Since 1981 they have been serving the BMW community with custom turbocharger kits to a myriad of other innovative and inspiring performance parts.

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Rein Thermostat - 88ï¿½C - E30, E34, E36, Z3

2X Entries Into Our F80 M3 Sweepstakes

T#:591800

Part#: 11537511580

In Stock at Vendor

$ 37.99 USD

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$ 37.99 USD

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Common point of failure in the cooling system.

Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...

2X Entries Into Our F80 M3 Sweepstakes

T#:591144

Part#: 11531265084

Ships in 4 Business Days

$ 2.99 USD

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$ 2.99 USD

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

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

2X Entries Into Our F80 M3 Sweepstakes

T#:34114243

Part#: 11531710953

In Stock

$ 19.99 USD

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$ 19.99 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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BMW Thermostats for BMW 5 Series E34 (1987-1995)

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

Aluminum Thermostat Housing Kit - M50

Rein Thermostat - 88ï¿½C - E30, E34, E36, Z3

Rein Thermostat O-Ring (60 X 3.5 mm) - E28 E30 E32 E34 E36 E39 Z3 E23...

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

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