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BMW Thermostats for BMW E46 M3 S54 (1999-2005)

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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 - E46 M3

T#:554082

Part#: 11531318274KT2

In Stock

$ 139.99

This product was last offered at the strikethrough price on
07-16-2026

$ 85.99 USD

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$ 85.99 USD

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When it comes time to replace your thermostat, be sure you have everything you need. This kit includes everything you need to replace your thermostat, including the thermostat.

Kit includes:

Thermostat
Thermostat O-Ring
1.5 Liters of coolant

This item fits the following BMWs:
2001-2006 E46 BMW M3

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Cooling System Refresh Kit - Level 1

T#:15744012

Part#: 32411712735-KT

In Stock

Sale - Save 8% $ 664.99

This product was last offered at the strikethrough price on
07-16-2026

$ 613.59 USD

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Sale - Save 8%

$ 664.99

This product was last offered at the strikethrough price on
07-16-2026

$ 613.59 USD

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Stop the problems before they arise. If you vehicle has 60,000 miles or more, replace all of these components to ensure that your vehicle stays healthy. To keep everything in top order, continue to replace these components at 60,000 mile intervals. Water pump failure, cracked plastic housings, and expansion tank leaks will not be a concern once all these problem parts are replaced. Included in this kit are the following parts. Rein Water Pump with metal impeller FAE Fan Switch Vaico Q+ thermostat - made in Germany! New O-ring Sealing Gaskets OEM Expansion Tank & Cap 1 Gallon Coolant Rein Upper & Lower Radiator Hoses

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OEM Wahler 80 Degree Thermostat - E46 M3, MZ3 S54, Z4 M

T#:360524

Part#: 11531318274

In Stock

$ 105.99

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

$ 68.99 USD

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$ 68.99 USD

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Replacement 80* Celcius thermostat for E46 M3, Z3M w S54 engine, Z4M. The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.

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Genuine BMW Thermostat - 80*C - E46 M3, MZ3 S54, Z4 M

T#:12502

Part#: 11531318274

In Stock

16% off MSRP $ 147.44

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

$ 123.15 USD

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16% off MSRP

$ 147.44

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

$ 123.15 USD

Add to Wish List

GENUINE BMW THERMOSTAT - E46 M3, MZ3 (S54), MZ4. This is just the thermostat itself and does not include the housing o-ring or any others that are advised for replacement. See thermostat kit or our water pump kit for a complete package.

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.

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Thermostat With O-Rings - E46 M3, MZ3, Z4 M

T#:2303

Part#: 11531318274-K

In Stock

$ 148.76 USD

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$ 148.76 USD

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Replacement stock thermostat for E46 M3, Z3M w S54 engine, Z4M.The thermostat can be replaced on the E46 M3 without removing the water pump. This can save you money if the pump still has life left on it but the thermostat needs to be done now. Symptoms of a bad thermostat include an erratic temp gauge and a fault code. When replacing the thermostat, there are three o-rings that will likely need to be replaced between the thermostat and the water pump housing, and two on the coolant tube going to the head. We also recommend new hoses, clamps, and BMW coolant. Replacement should take about one hour.

Note: even though this can be done without replacing the water pump, the job involves removing the same items to access this area. And opening the thermostat housing will spill a lot of coolant. In other words, if you don't replace the water pump at the same time, you're going to repeat this process when the pump needs replacing. We offer a complete water pump overhaul package that covers everything you need if you want to it all at once. You can the thermostat to that package and get everything without any duplicate parts. Click here for the E46 M3 water pump kit.

On S54 engines (E46 M3, MZ3, Z4 M) there is a flanged head bolt going into the cylinder head, behind the thermostat cover. This holds the left side timing chain guide rail in place and if it's loose or falls out you could have a very serious engine failure to deal with. Make sure to check this bolt while you have the thermostat cover off. You only need to make sure it's tight. But if it's come loose you may want to replace the seal ring and use a small touch of oil-resistant thread sealer.

This item fits the following BMWs:
2000-2001 E46 3 Series M3 M3 Convertible 2000-2006
2001-2002 Z3 Roadster / Coupe Z3 M Roadster Z3 M Coupe w S54 Engine
2006-2008 E86 E86 Z4 Z4 M Roadster Z4 M Coupe

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Motorsport Thermostat - 55 (NO LONGER AVAILABLE)

T#:337991

Part#: 11531417215

Back Ordered

Starting at $ 232.98 USD

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Starting at $ 232.98 USD

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E46M3 Motorsport Thermostat 55C (Also fits Euro E36 M3 engine) A Genuine BMW part this thermostat opens at a much lower temperature than stock to keep your S54 engine (or Euro S50/S52 engine) running cooler in race applications.

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Wahler Thermostat O-Ring - E46, Z3, Z4

T#:362366

Part#: 11531318402

In Stock

$ 6.17 USD

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$ 6.17 USD

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BMW does not include a o-ring with their new thermostats

Elring Thermostat O-Ring - BMW S54 3.2L

T#:45278657

Part#: 293.300

Special Order: No Guaranteed ETA

Sale - Save 27% $ 3.99

This product was last offered at the strikethrough price on
08-14-2026

$ 2.90 USD

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Qty

Sale - Save 27%

$ 3.99

This product was last offered at the strikethrough price on
08-14-2026

$ 2.90 USD

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Seals the thermostat and thermostat housing to the water pump Replaces BMW # 11531318402

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