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BMW E46 Thermostats

BMW E46 Thermostats BMW thermostats. Don't take chances! Proper maintenance is required to keep your car performing at peak levels. The thermostat basically controls when your car will overheat. Don't let it fail on you. We carry both OEM BMW thermostats and low temp aftermarket BMW thermostats for use in hot climates or track/race use
You're currently viewing parts for your (E46) 3-Series 1999-2005. Reset your chassis
For accurate results, specify your model below.
Motorsport Thermostat - 55� C - E46 M3 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.
Part #: 11531417215
Price: $165.29 (USD) 
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Thermostat - 68 Degree - E24, E28, E30, E32, E34, E36, E39, Z3 The thermostat regulates the temperature of your coolant. At a predetermined temperature the thermostat will open to let coolant flow to the radiator and be cooled by airflow or the fan. Over time the thermostat will become stuck open or closed, leading to a variety of issues. A closed thermostat will never allow the coolant to reach the radiator and be cooled. Hot coolant will continue to circulate through the engine and absorb even more heat until boiling and the system overheats. An open thermostat is not as bad but is still not ideal - the coolant is always cool, with the temp needle always reading in the cool range. This tells the ECU to richen the fuel mixture to bring the car up to normal operating temp. So your fuel mileage decreases and the car runs rich. 

Replacing the thermostat is an easy but messy job. This thermostat includes the main o-ring (but a housing gasket may be required). Consider replacing the housing and any associated temp sensors while you're in there. The cooling system will need to be bled after. 

Most of the engines from the mid-1980s through the 1990s use the same thermostat design and they are interchangeable among the different temperatures. This is the 68*C thermostat, at the bottom of the temperature range. It should only be used in racing situations such as when deleting the engine fan. However, keep in mind that BMW spent a lot of time engineering the cooling system to work in all kinds of conditions and changing thermostat temperature is not recommended to fix any failures in the cooling system. 

This thermostat fits the following BMWs:  
1977-1983  E21 BMW  323i 
1986-1991  E30 BMW  318is 318ic 325e 325es 325i 325ic 325is 325ix 
1992-1999  E36 BMW  318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3 
1982-1988  E28 BMW  528e 
1986-1988  E28 BMW  535i 
1989-1995  E34 BMW  525i 535i 
1997-1998  E39 BMW  528i 
1986-1989  E24 BMW  635csi 
1988-1994  E32 BMW  735i 735il 
1997-2000  Z3 BMW  Z3 2.8 M Roadster M Coupe 
Part #: MMTSE3692L
Price: $48.00 (USD) 
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Thermostat - E39 E46 E60 E53 Z3 Z4 with M54, M52TU engine Replacement stock MAP thermostat with plastic housing and gasket for E46, E39, E60, X5, Z4 - M54 engine, M52TU engine. Your car may still operate fine according the instrument display but the electrically-operated thermostat may be going bad. This new thermostat includes the thermostat gasket, ready to install in your BMW.

Applications:
1999-2003  E39  528i, 525i, 530i sedan, touring wagon (M52TU engine, M54 engine)
1999-2005  E46  323, 328, 325, 330 sedan, coupe, cabrio, touring wagon (M52TU engine, M54 engine)
2004-2005  E60  525i, 530i sedan, touring wagon (M54 engine)
2001-2006  E53  X5 3.0 (M54 engine)
2004-2006  E83  X3 2.5i X3 3.0i (M54 engine)
1999-2002  Z3  2.3. Z3 2.5i, 2.8 Z3 3.0i (M54 engine)
2003-2005  Z4  2.5i, Z4 3.0 (M54 engine)
Part #: 11537509227
Price: $53.95 (USD) 
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Transmission Thermostat (Mounted in Expansion Tank) for E46 X3 X5 Z4 This Automatic Transmission Thermostat mounts in the coolant expansion tank and helps to regulate the transmission coolant temperature. It is common for this item to break while replacing the expansion tank. This fits E46 323i 325i 328i 330i, X3 2.5i 3.0i, X5 3.0i, Z4 2.5i 3.0i 3.0si.

This item fits the following BMWs:
1999-2005 E46 BMW 323i 323ci 328i 328ci 325i 325ci 325xi 330i 330ci 330xi
2004-2006 X3 BMW X3 2.5i X3 3.0i
2000-2006 X5 BMW X5 3.0i
2004-2008 Z4 BMW Z4 2.5i Z4 3.0i Z4 3.0si
Part #: 17111437362
Price: $38.95 (USD) 
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OEM Hella Thermostat - E39 E46 E60 E53 Z3 Z4 with M54, M52TU engine

Replacement stock MAP thermostat with plastic housing and gasket for E46, E39, E60, X5, Z4 - M54 engine, M52TU engine. Your car may still operate fine according the instrument display but the electrically-operated thermostat may be going bad. This new OEM Hella thermostat includes the thermostat gasket, ready to install in your BMW.

Hella is a premium manufacturer that supplies automotive parts to numerous car brands across the world. Everything from electrical to mechanical genuine parts have been made and supplied directly to BMW before the vehicles ever leave the production floor. Their high quality, long lasting parts have made them a trusted brand chosen to help keep your BMW on the road for many years to come.

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!


Applications:
1999-2003 E39 528i, 525i, 530i sedan, touring wagon (M52TU engine, M54 engine)
1999-2005 E46 323, 328, 325, 330 sedan, coupe, cabrio, touring wagon (M52TU engine, M54 engine)
2004-2005 E60 525i, 530i sedan, touring wagon (M54 engine)
2001-2006 E53 X5 3.0 (M54 engine)
2004-2006 E83 X3 2.5i X3 3.0i (M54 engine)
1999-2002 Z3 2.3. Z3 2.5i, 2.8 Z3 3.0i (M54 engine)
2003-2005 Z4 2.5i, Z4 3.0 (M54 engine)

 

Part #: 11537509227
Price: $59.95 (USD) 
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Motorsport Thermostat - 60C - Complete with Housing - M54 / M52tu This is a genuine BMW Motorsport part, designed specifically for BMW racing applications. We use this exact thermostat setup in our Championship-winning E46 330i race car. It is designed to be used on all M54 and M52TU double-VAN0S engines, as used in the 1999-2000 E46 323/328 and 2001-2005 E46 325/330. This 60 degree C (140 defrees F) thermostat comes complete with plastic thermostat housing. It does not use the plug and wiring for the stock DME so this should only be used with an aftermarket engine management system (Motec, Bosch, etc).
Part #: TMS1171
Price: $459.95 (USD) 
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Thermostat - E46 M3, MZ3 S54, Z4 M 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.
Part #: 11531318274
Price: $69.95 (USD) 
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Thermostat - 62 Degree - E24, E28, E30, E32, E34, E36, E39, Z3 The thermostat regulates the temperature of your coolant. At a predetermined temperature the thermostat will open to let coolant flow to the radiator and be cooled by airflow or the fan. Over time the thermostat will become stuck open or closed, leading to a variety of issues. A closed thermostat will never allow the coolant to reach the radiator and be cooled. Hot coolant will continue to circulate through the engine and absorb even more heat until boiling and the system overheats. An open thermostat is not as bad but is still not ideal - the coolant is always cool, with the temp needle always reading in the cool range. This tells the ECU to richen the fuel mixture to bring the car up to normal operating temp. So your fuel mileage decreases and the car runs rich.  

Replacing the thermostat is an easy but messy job. This thermostat includes the main o-ring (but a housing gasket may be required). Consider replacing the housing and any associated temp sensors while you're in there. The cooling system will need to be bled after.  

Most of the engines from the mid-1980s through the 1990s use the same thermostat design and they are interchangeable among the different temperatures. This is the 62*C thermostat, at the bottom of the temperature range. It should only be used in racing situations such as when deleting the engine fan. However, keep in mind that BMW spent a lot of time engineering the cooling system to work in all kinds of conditions and changing thermostat temperature is not recommended to fix any failures in the cooling system.  

This thermostat fits the following BMWs:    
1977-1983   E21 BMW   323i  
1986-1991   E30 BMW   318is 318ic 325e 325es 325i 325ic 325is 325ix  
1992-1999   E36 BMW   318i 318is 318ti 318ic 323is 323ic 325i 325is 325ic 328i 328is 328ic M3  
1982-1988   E28 BMW   528e  
1986-1988   E28 BMW   535i  
1989-1995   E34 BMW   525i 535i  
1997-1998   E39 BMW   528i  
1986-1989   E24 BMW   635csi  
1988-1994   E32 BMW   735i 735il  
1997-2000   Z3 BMW   Z3 2.8 M Roadster M Coupe 
Part #: MMTSE3692
Price: $48.00 (USD) 
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Quantity:   
Mishimoto 70 Degree Performance Thermostat - E46 323 325 328 330 The thermostat regulates the temperature of your coolant. At a predetermined temperature the thermostat will open to let coolant flow to the radiator and be cooled by airflow or the fan. Over time the thermostat will become stuck open or closed, leading to a variety of issues. A closed thermostat will never allow the coolant to reach the radiator and be cooled. Hot coolant will continue to circulate through the engine and absorb even more heat until boiling and the system overheats. An open thermostat is not as bad but is still not ideal - the coolant is always cool, with the temp needle always reading in the cool range. This tells the ECU to richen the fuel mixture to bring the car up to normal operating temp. So your fuel mileage decreases and the car runs rich.   

Replacing the thermostat is an easy but messy job. This thermostat includes the main o-ring (but a housing gasket may be required). Consider replacing the housing and any associated temp sensors while you're in there. The cooling system will need to be bled after.   

 
Part #: MMTS-E46-99
Price: $48.00 (USD) 
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Thermostat With O-Rings - E46 M3, MZ3, Z4 M 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
Part #: 11531318274-K
Price: $81.80 (USD) 
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