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BMW 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
For accurate results, specify your model below.
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: $59.95 (USD) 
Quantity:   
Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependant on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. 

This item fits the following BMWs:
2014+  F22 BMW  M235i M235i xDrive 
2014+  F23 BMW  M235i 
2012+  F30 BMW  335i 335i xDrive - Sedan
2013+  F32 BMW  435i 435i xDrive - Coupe
2013+  F33 BMW  435i Convertible 435i xDrive Convertible- Convertible
2014+  F34 BMW  335i xDrive GT - Gran Tourismo
2014+  F36 BMW  435i Gran Coupe 435i xDrive Gran Coupe
2014+  F15 BMW  X5 sDrive35i X5 xDrive35i 
2015+  F16 BMW  X6 sDrive35i X6 xDrive35i 
Part #: 11532394968
Price: $108.95 (USD) 
Quantity:   
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) 
Quantity:   
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. This thermostat fits BMW E39 M5 E34 M5 and Z8

This thermostat fits the following BMWs:
1991-1993 E34 BMW M5
1998-2004 E39 BMW M5
2000-2003 E52 BMW Z8
Part #: 11537835558
Price: $61.76 (USD) 
This packages covers the major components you would install along with a new water pump or thermostat. On the N51/N52 cars (128i, 325i 328i, 330i, 525i, 528i, 530i) the water pump and theremostat are mounted together. In fact, to get to the thermostat, BMW expects you to remove the water pump. This package covers the whole job. With the electric water pump now an integral part of the efficiency and performance of the engine, staying on top of its maintenance and replacement is the smart thing to do.

Our water pump/thermostat overhaul includes:
  • OEM electric water pump, p/n 11517586925.
  • aluminum mounting screws for water pump (set of 3), p/n 11510392553
  • OEM Behr thermostat, p/n 11537549476
  • Original BMW connecting hose from thermostat to water pump, p/n 11537521049
  • OEM-style hose clamps for hose (x 2)
    BUY AS A PACKAGE AND SAVE $$!

    The water pump on the N52 engine has more cooling responsibilities than ever before. Not only must it provide cooling for the engine, but it's also pumping fluid used to cool the automatic transmission oil. The good news is that the pump only works when, and only as much, as it needs to. The engine computer dictates how much fluid needs to be pumped through the system depending on the load. That means the system can actually stop the pump when warmer temperatures are needed. No longer is the pump spinning all the time from an engine-driven belt. The bad news is that it's now an electrical part, so a failure is usually immediate and with no warning. And if the electronics are at fault, there is no way to rebuild or repair it. Fortunately, the engine computer will force a shut down or reduce power if a problem occurs, preventing catastrophic engine damage.

    How to avoid a water pump failure in the future? Replacing the water pump as part of a regular interval schedule will ensure you always have a functioning pump in place. Since this technology is relatively new for BMW, therefore the lifecycle of the pump isn't yet known, we have been recommending replacement every 80-100k miles. This package of OE/OEM parts covers everything with Original BMW coolant offered to finish off the job. A proper bleeding procedure must be followed with the new electric pump.

    This water pump package fits the following BMWs with the N51/N52 engine:
    2008-2013 E82 BMW 128i
    2006-2011 E90 BMW 325i 325xi 328i 328xi 328i xDrive 330i 330xi - Sedan
    2006-2012 E91 BMW 325xi 328i 328xi 328i xDrive - Wagon
    2007-2013 E92 BMW 328i 328xi 328i xDrive - Coupe
    2007-2013 E93 BMW 328i - Convertible
    2006-2010 E60 BMW 525i 525xi 530i 530xi 528i 528xi 528i xDrive
    2006-2010 E83 BMW X3 3.0i X3 3.0si
    2006-2008 E85 BMW Z4 2.5i Z4 3.0i Z4 3.0si
    2009+ Z4 BMW Z4 sDrive30i
    2009+ Z4 BMW Z4 sDrive28i Z4 sDrive30i Z4 sDrive35i Z4 sDrive35is
  • Part #: TMS206099
    Price: $516.60 (USD) 
    Replacement stock thermostat for E90, E92, E93 M3 - S65 engine- E60 M5 E63 M6 with S85 engine. Your car may still operate fine according the instrument display but the electrically-operated thermostat may be going bad.

    This item fits the following BMWs:
    2007+ E9X BMW M3
    2005+ E60 BMW M5
    2005+ E63 BMW M6
    Part #: 11537836155
    Price: $49.95 (USD) 
    Quantity:   
    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 88* thermostat, towards the top of the range. 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 #: 11537511580
    Price: $27.95 (USD) 
    Quantity:   
    This is the Genuine MINI thermostat housing with thermostat for cars with the N12 or N14 engines.

    This item fits the following MINIs:
    2007+ R56 MINI MINI Cooper, MINI Cooper S
    2007+ R55 MINI MINI Cooper Clubman, MINI Cooper S Clubman
    2007+ R57 MINI MINI Cooper Convertible, MINI Cooper S Convertible,
    Part #: 11537534521
    Price: $126.95 (USD) 
    Quantity:   
    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. This thermostat fits BMW E32 740i E34 530i 540i E38 740i E31 840ci with M60 engine.

    This item fits the following BMWs:
    1992-1994 E32 BMW 740i 740il
    1993-1995 E34 BMW 530i 530i wagon 540i
    1995-1996 E38 BMW 740i 740il
    1991-1996 E31 BMW 840i 840ci with M60 engine
    Part #: 11531702279
    Price: $24.95 (USD) 
    Quantity:   
    Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependent on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. This replacement thermostat fits many of the N55 6 cylinder engines and is an Wahler part. The thermostat is located along with the water pump on the side of the engine. To gain access for removal you may need to remove the water pump as well. If the water pump is removed you MUST replace its mounting bolts. You can add them from the options below. We also have a bundled package that includes the water pump, mounting screws, connecting hose, and clamps if you want to replace everything together (recommended).

    This item fits the following BMWs:
    2008-2013  E82 BMW  135i 135is 1M Coupe
    2013+  E84 BMW  X1 xDrive35i
    2011  E90 BMW  335i 335xi 335i xDrive - Sedan
    2011-2013  E92 BMW  335i 335xi 335i xDrive - Coupe
    2011-2013  E93 BMW  335i Convertible
    2011-2013  E70 BMW  X5 xDrive35i
    2011-2013  E71 BMW  X6 xDrive35i
    Part #: 11537601158
    Price: $108.95 (USD) 
    $124.22 (12% off MSRP)
    Quantity:   
    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 80* thermostat, towards the lower end of the range. 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 #: 11531713040
    Price: $26.95 (USD) 
    Quantity:   
    Don't take chances! Proper maintenance is required to keep your BMW performing at peak levels. The thermostat basically controls when your car will overheat. Includes gasket part number 11531740437. This fits the 1997 through 9/98 E39 528i only.

    This thermostat housing fits the following BMWs:
    1997-1998 E39 BMW 528i
    Part #: 11531740478K
    Price: $25.90 (USD) 
    Quantity:   
    Replacement stock thermostat, 80 Degree C.

    This item fits the following BMWs:
    1984-1995 E30 BMW 325e 325es
    1982-1985 E28 BMW 528e
    Part #: 11531265085
    Price: $24.95 (USD) 
    Quantity:   
    A COMMON FAILURE ! Replace your brittle plastic factory housing with this rugged aluminum one! A cracked plastic housing can leave you stranded, eliminate that risk with this metal housing. Includes 11531722531 thermostat housing and 11531740437 profile gasket. (This is one of TMS's best sellers).

    This thermostat fits the following BMWs:
    1991-1995 E34 5 Series BMW 525i 525i wagon
    1992-1998 E36 3 Series BMW 325i 325is 325ic 328i 328is 328ic 323is 323ic
    1995-1999 E36 3 Series BMW M3
    1996-1998 Z3 BMW Z3 2.8i Z3 M Roadster, M Coupe - S52 engine
    Part #: 11531722531K
    Price: $23.90 (USD) 
    Quantity:   
    Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependent on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. This replacement thermostat fits many of the N55 6 cylinder engines and is an Wahler part. The thermostat is located along with the water pump on the side of the engine. To gain access for removal you may need to remove the water pump as well. If the water pump is removed you MUST replace its mounting bolts. You can add them from the options below. We also have a bundled package that includes the water pump, mounting screws, connecting hose, and clamps if you want to replace everything together (recommended).

    This item fits the following BMWs:
    2008-2013 E82 BMW 135i 135is 1M Coupe
    2013+ E84 BMW X1 xDrive35i
    2011 E90 BMW 335i 335xi 335i xDrive - Sedan
    2011-2013 E92 BMW 335i 335xi 335i xDrive - Coupe
    2011-2013 E93 BMW 335i Convertible
    2011-2013 E70 BMW X5 xDrive35i
    2011-2013 E71 BMW X6 xDrive35i
    Part #: 11537601158
    Price: $78.95 (USD) 
    Quantity:   
    Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. High-revving, spirited driven cars like the E30 M3 require tip-top condition to perform well. The cooling system of the S14 one of those critical systems. This thermostat fits all 1987, 1988, 1989, 1990, and 1991 M3 (E30 chassis with S14 engine). Genuine BMW.

    This item fits the following BMWs:
    1987-1991 E30 BMW M3
    Part #: 11531315537
    Price: $143.95 (USD) 
    Quantity:   
    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. This thermostat fits BMW N62 engines in E60 545i 550i X5 4.4i 4.8i 650i 745i 750i 745li 750li 760i 760li X6 xDrive50i

    This item fits the following BMWs:
    2004-2010 E60 BMW 545i 550i
    2011+ F10 BMw 550i 550i xDrive
    2004+ E63 BMW 645ci 650i
    2002-2009 E65 BMW 745i 745li 750i 750li 760i 760li
    2009+ F01 BMW 750i 750li 750i xDrive 750li xDrive 760li
    2004-2006 E53 BMW X5 4.4i w N62 engine E70 BMW X5 4.8i X5 xDrive48i
    2007-2014 E71 BMW X6 xDrive50i
    Part #: 11537586885
    Price: $67.95 (USD) 
    Quantity:   
    This aluminum thermostat housing cover is a direct replacement for the factory unit. It fits BMW E32 740i 740il E34 530i 540i E38 740i 740il 1995, E31 840i thru 1995.

    This item fits the following BMWs:
    1993-1995 E34 BMW 530i 540i
    1988-1994 E32 BMW 740i 740il
    1995-2001 E38 BMW 740i 740il
    1990-1999 E31 BMW 840i 840ci
    Part #: 11531720173
    Price: $19.95 (USD) 
    Quantity:   
    Don't take chances! Proper maintenance is required to keep your BMW performing at peak levels. The thermostat basically controls when your car will overheat. Don't let it fail on you. This thermostat fits BMW E38 750il and E31 850i

    This item fits the following BMWs:
    1995-1998 E38 BMW 750il
    1995-1998 E31 BMW 850ci w M73 engine
    Part #: 11531704704
    Price: $59.95 (USD) 
    Quantity:   
    Don't take chances! Proper maintenance is required to keep your MINI performing at peak levels. The thermostat basically controls when your car will overheat. This thermostat fits MINI Cooper S R52 R53 with supercharged engine.

    This item fits the following BMWs:
    2002-2006 R53 MINI MINI Cooper S
    2003-2007 E52 MINI MINI Cooper S Convertible
    Part #: 11531485847
    Price: $34.95 (USD) 
    Quantity:   
    Don't take chances! Proper maintenance is required to keep your BMW performing at peak levels. The thermostat basically controls when your car will overheat. This thermostat fits BMW E28 M5 and E24 M6 with S38 engine.

    This item fits the following BMWs:
    1987-1988 E28 BMW M5
    1987-1989 E24 BMW M6
    Part #: 11531307737
    Price: $29.95 (USD) 
    Quantity:   
    Don't take chances! Proper maintenance is required to keep your BMW performing at peak levels. The thermostat basically controls when your car will overheat. This thermostat fits BMW E32 750il and E31 850i with M70 engine.

    This item fits the following BMWs:
    1989-1994 E32 BMW 750il
    1991-1995 E31 BMW 850i with M70 engine
    Part #: 11531729720
    Price: $39.95 (USD) 
    Quantity:   
    Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependant on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. This replacement thermostat fits many of the N20 N26 4 cylinder engines. Alternate part numbers: 11538635689, 11537633476, 11538636595, 11538636594.

    This item fits the following BMWs:
    2012+ F30 BMW 320i 320i xDrive 328i 328i xDrive - Sedan
    2013+ F31 BMW 328i xDrive - Wagon
    2013+ F32 BMW 428i 428i xDrive - Coupe
    2013+ F33 BMW 428i Convertible 428i xDrive Convertible - Convertible
    2014+ F34 BMW 328i xDrive GT - Gran Tourismo
    2014+ F36 BMW 428i Gran Coupe 428i xDrive Gran Coupe
    2012+ F10 BMW 528i 528i xDrive
    2014+ F22 BMW 228i 228i xDrive
    2014+ F23 BMW 228i 228i xDrive
    2011+ F25 BMW X3 xDrive28i
    2015+ F26 BMW X4 xDrive28i
    2009+ E89 BMW Z4 sDrive28i
    Part #: 11538648791
    Price: $69.95 (USD) 
    Quantity:   
    This is the stock aluminum thermostat housing for cars with the M20 6 cylinder engine - 325e, 325i, 528e, 525i. This is the side of the housing that mounts to the cylinder head and has openings for the various coolant / engine temperature sensors. There are 4 ports for sensors so check your existing housing for the sensor layout. You may need to also buy plugs for the ports that you don't use (see Additional Items below).

    This item fits the following BMWs:
    1984-1991  E30 BMW  325e 325es 325i 325ic 325is 325ix
    5/1982-1988  E28 BMW  528e
    1989-1990  E34 BMW  525i
    Part #: 11531730470
    Price: $42.95 (USD) 
    Quantity:   
    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: $58.95 (USD) 
    Quantity:   
    Engine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependant on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. This replacement thermostat fits many of the N51 N52 N53 N54 6 cylinder engines and is an OEM Behr part. 

    The thermostat is located along with the water pump on the side of the engine. To gain access for removal you may need to remove the water pump as well. If the water pump is removed you MUST replace its mounting bolts. You can add them from the options below. We also have a bundled package that includes the water pump, mounting screws, connecting hose, and clamps if you want to replace everything together (recommended). 

    This thermostat fits the following BMWs:
    2008+  E82  BMW 128i 135i
    2007+  E9X  BMW 325i 325xi 328i 328xi 330i 335i 335xi
    2006+  E60  BMW 525i 525xi 528i 528xi 530i 530xi 535i 535xi
    2006+  X3  BMW X3 3.0i X3 3.0si
    2006+  Z4  BMW Z4 3.0i Z4 3.0siEngine running a little hot or is the temp gauge not telling you anything? The thermostat might be the likely problem. Many cooling issues start with the thermostat. This is electronically controlled by the engine computer based on the cooling demands from the engine. And cooling components are working harder than ever. Engine performance is also dependant on temperature - as temperatures rise and pass a certain threshold the engine computer will begin reducing power. Stay on top of your cooling maintenance by replacing critical components preventatively. This replacement thermostat fits many of the N51 N52 N53 N54 6 cylinder engines and is an OEM Behr part. 

    The thermostat is located along with the water pump on the side of the engine. To gain access for removal you may need to remove the water pump as well. If the water pump is removed you MUST replace its mounting bolts. You can add them from the options below. We also have a bundled package that includes the water pump, mounting screws, connecting hose, and clamps if you want to replace everything together (recommended). 

    This thermostat fits the following BMWs:
    2008+  E82  BMW 128i 135i
    2007+  E9X  BMW 325i 325xi 328i 328xi 330i 335i 335xi
    2006+  E60  BMW 525i 525xi 528i 528xi 530i 530xi 535i 535xi
    2006+  X3  BMW X3 3.0i X3 3.0si
    2006+  Z4  BMW Z4 3.0i Z4 3.0si
    Part #: 11537549476
    Price: $74.95 (USD) 
    Quantity:   
    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 71* 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 #: TMS1907
    Price: $28.95 (USD) 
    Quantity:   
    This packages covers the major components you would install along with a new water pump or thermostat. On the N54 cars (135i, 335i, 535i) the water pump and theremostat are mounted together. In fact, to get to the thermostat, BMW expects you to remove the water pump. This package covers the whole job. With the electric water pump now an integral part of the efficiency and performance of the engine, staying on top of its maintenance and replacement is the smart thing to do.

    Our water pump/thermostat overhaul includes:
  • Genuine BMW electric water pump, p/n 11517588885 or 11517632426
  • mounting screws for water pump (set of 3), p/n 11517602123
  • OEM Behr thermostat, p/n 11537549476
  • Original BMW connecting hose from thermostat to water pump, p/n 11537545665
  • OEM-style hose clamps for hose (x 2)
    BUY AS A PACKAGE AND SAVE $$!

    The water pump on the N54 engine has more cooling responsibilities than ever before. Not only must it provide cooling for the engine, but it's also pumping fluid used to cool the turbocharger oil and automatic transmission oil. The good news is that the pump only works when, and only as much, as it needs to. The engine computer dictates how much fluid needs to be pumped through the system depending on the load. That means the system can actually stop the pump when warmer temperatures are needed. No longer is the pump spinning all the time from an engine-driven belt. The bad news is that it's now an electrical part, so a failure is usually immediate and with no warning. And if the electronics are at fault, there is no way to rebuild or repair it. Fortunately, the engine computer will force a shut down or reduce power if a problem occurs, preventing catastrophic engine damage.

    How to avoid a water pump failure in the future? Replacing the water pump as part of a regular interval schedule will ensure you always have a functioning pump in place. Since this technology is relatively new for BMW, therefore the lifecycle of the pump isn't yet known, we have been recommending replacement every 80-100k miles. This package of OE/OEM parts covers everything with Original BMW coolant offered to finish off the job. A proper bleeding procedure must be followed with the new electric pump.

    This water pump package fits the following BMWs with the N54 engine:
    2007-2010 E60 BMW 535i 535xi 535i xDrive
    2008-2010 E82 BMW 135i
    2011-2012 E82 BMW 1M Coupe
    2006-2010 E90 BMW 335i 335xi 335i xDrive - Sedan
    2007-2010 E92 BMW 335i 335is 335xi 335i xDrive - Coupe
    2007-2010 E93 BMW 335i - Convertible
  • Part #: TMS16432
    Price: $522.50 (USD) 
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