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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.
Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.
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
This product was last offered at the strikethrough price on
04-25-2026
This product was last offered at the strikethrough price on
02-20-2026
Upgrade your BMW's cooling system with the Turner Motorsport Mahle Coolant Expansion Tank. This essential component provides additional space for coolant expansion and contraction, ensuring optimal performance in varying temperatures. Designed to withstand drastic temperature changes, this expansion tank prevents coolant leaks and maintains proper coolant levels in your vehicle. Replace your damaged tank to keep your BMW's cooling system running smoothly.
This product was last offered at the strikethrough price on
06-03-2026
This product was last offered at the strikethrough price on
03-13-2026
This product was last offered at the strikethrough price on
04-29-2026
This product was last offered at the strikethrough price on
04-15-2026
This OEM Hella/Mahle-Behr engine fan clutch fits BMW E46 M3, Z3 M Roadster, M Coupe 2001-2002, E34 535i & M5, and E32 735i 735il. Made to the same or higher standards of quality as the genuine part, ensuring proper fan control and cooling. Failed fan clutches can result in overheating due to the fan not spinning fast enough to deal with excess heat or can cause poor engine performance when a clutch has locked up causing the fan to be fully engaged permanently.
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!
This item fits the following BMWs:
2001-2006 E46 BMW M3
1989-1993 E34 BMW 535i M5
1988-1992 E32 BMW 735i 735il
2001-2002 Z3 BMW M Roadster M Roadster
This product was last offered at the strikethrough price on
04-29-2026
This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
04-01-2026
This product was last offered at the strikethrough price on
05-07-2026
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.
Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.
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)
This product was last offered at the strikethrough price on
06-04-2026
Don't take chances! Proper maintenance is required to keep your BMW performing at peak levels. The thermostat is important in keeping your vehicle cool, allowing coolant to pass once the engine has reached a certain temperature. Use a high quality thermostat such as this OEM Hella thermostat to ensure reliability and long engine life.
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!
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
This product was last offered at the strikethrough price on
04-09-2026
This product was last offered at the strikethrough price on
01-08-2026
This is a Hella brand (OEM supplier to BMW) replacement radiator for all 1999-2006 E46 3 series (non-M), including 323i, 323Ci, 328i, 328Ci, 325i, 325Ci, 330i, 330Ci, and Z4 2.5 and 3.0. Compare to BMW list price of $318! Save big, while still getting the highest quality radiator available for 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!
This radiator fits the follow BMWs::
Only for Automatic Transmission
1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi - Not for cars with M56 engine
2006-2008 E85 E86 Z4 BMW Z4 M Coupe Z4 M Roadster
This product was last offered at the strikethrough price on
05-07-2026
This radiator expansion tank (coolant reservoir) is used on E39 540i from 1997-2003 and E38 740i 740il 750il from 1995-2001. It is a common failure item. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on. This OEM Hella tank will give you a long life-span and will put your worries to rest of possible failure and coolant loss.
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!
This item fits the following BMWs:
1997-2003 E39 BMW 540i, 540i wagon
1995-2001 E38 BMW 740i 740il 750il
1990-1998 E31 BMW 840i 840ci 850i 850ci
2000-2003 E52 BMW Z8
This product was last offered at the strikethrough price on
03-03-2026
This product was last offered at the strikethrough price on
05-07-2026
OEM Hella/Behr brand replacement radiator for all 1999-2000 E39 528i (all), 2001-2003 525i & 530i (all), and 540i Sport with 6 Speed Manual Transmission. This radiator is made by Hella/Behr, an original equipment (OE) supplier to BMW. This is the brand we use exclusively on our own 5 series BMWs, and think you should as well. A common failure item is the radiator. It is such a common failure item we recommend replacing this item preventatively every 80,000 miles. This Radiator is made by Hella/Behr, a high quality OE manufacturer. Replaces part number # 17111436060
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!
This BEHR Radiator fits the following BMWs:
1999-2000 E39 528i (manual & automatic)
2001-2003 E39 525i & 530i (manual & automatic)
1999-2003 E39 540i Sport 6 Speed (manual transmission)
This product was last offered at the strikethrough price on
03-09-2026
This radiator expansion tank is used on E53 X5 4.4i and 4.6is with M62 engine, and Z3 2.3 2.5i 2.8 3.0i from 1999-2002. It is a common failure item as the plastic weakens over time and stress cracks will lead to coolant leaks. We have found that the expansion tanks should be replaced based on age as well as condition. Expansion tanks seem to have a lifespan of less than six years before they show signs of fatigue and wear. Pre-emptively replacing the expansion tank as part of an overall maintenance plan can prevent you from getting stranded from a sudden failure later on. This is the OEM Behr part - not an aftermarket. We have found that the aftermarket coolant reservoirs fail easier than the OEM Behr part. Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.
Hailing from Stuttgart, Mahle-Behr specializes in automotive cooling systems. From air conditioning to engine cooling M-B has you covered with OE-quality replacement parts.
This item fits the following BMWs:
2000-2003 X5 BMW X5 4.4i X5 4.6is
1999-2002 Z3 BMW Z3 2.3 2.5i 2.8 3.0i
This high quality Hella/BEHR brand expansion tank is used on M42, M44, M50, M52, engines, and is a common failure item on all E36 3 series with 4 cylinder engines (318i/is/ti/ic) 1990-1999, Z3 with 1.9 liter and E34 525i from 1989-1995. Hella/BEHR was the original equipment supplier to BMW, so you know the Hella/BEHR made expansion tank will be the highest quality available. Be leary of competitors selling this part for less -- is it a Hella/BEHR? Probably not. We only carry the Hella/BEHR brand expansion tank as it is the only one we use in our own BMWs.
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!
This item fits the following BMWs:
1990-1991 E30 BMW 318i 318is 318ic
1992-1998 E36 BMW 318i 318is 318ti 318ic
1989-1995 E34 BMW 525i
1996-1998 Z3 BMW Z3 1.9
This product was last offered at the strikethrough price on
01-21-2026
This product was last offered at the strikethrough price on
01-21-2026
OEM Hella/BEHR brand replacement radiator for all E34 530i 540i and E32 740i 740il E31 850csi. This radiator is made by Hella/BEHR, an original equipment supplier to BMW. Hella/BEHR radiators are what we use our own BMWs and customer installs.
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!
This item fits the following BMWs:
1992-6/1994 E34 BMW 530i Manual Transmission
1992-1995 E34 BMW 540i Manual Transmission
1992-1995 E34 BMW 540i Automatic Transmission - for cars with external transmission cooler
1993-1994 E32 BMW 740i 740il only for cars with external transmission cooler
1994-1995 E31 BMW 850csi
This product was last offered at the strikethrough price on
04-10-2026
This OEM Mahle-Behr fan clutch is a direct replacement for your original fan clutch. Has your fan clutch failed or is beginning to fail? A failing fan clutch will cause the engine fan to either not turn at all, or to turn very slowly and lifelessly, providing insufficient cooling for the radiator (especially noticeable while idling or in stop/go traffic).
This item fits the following BMWs:
1998-2003 E39 BMW M5
2000-2003 E52 BMW Z8 Roadster
OEM HELLA/BEHR brand replacement radiator for E60 525i/528i/530i and 550i, E63 650i, E65 750i/li 10/2005+. This radiator is made by HELLA/BEHR, an original equipment supplier to BMW. HELLA/BEHR radiators are what we use our own BMWs and customer installs. We've found the HELLA/BEHR radiator has the highest lifespan, least amount of manufacturing defects, and best continued cooling performance for your BMW. Simply put, you do not want anything else in your BMW but a HELLA/BEHR brand radiator.
Click here for important info on the 2006-2010 525i/528i/530i radiator.
Hella/Behr 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!
This item fits the following BMWs:
2004-2005 E60 BMW 525i 530i (M54)- Only for Automatic Transmission
2006-2010 E60 BMW 525i 528i 530i (N52)* - Only for Automatic Transmission
2006-2010 E60 BMW 550i - Only for Automatic Transmission
2006-2011 E63 BMW 650i - Only for Automatic Transmission
10/2005-2008 E65 BMW 750i 750li
* - must see link above about N52 fitments.
This radiator is the OEM Hella replacement for the stock radiator in the E60 545i and E63 645ci and E65 745i. Keeping your BMW at peak performance means including your cooling system in your regular maintenance schedules with the radiator, water pump, and thermostat being the primary components needing replacement. Not only can a failed radiator leave you stranded, but the sophisticated engine electronics will limit engine operability if temperatures reach a certain level. So having an efficient and fully functional cooling system is critical not only for safety but for performance as well. Don't wait until it's too late!
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!
This item fits the following BMW Chassis:2004-2005 E60 BMW 545i - Automatic Transmission
2004-2005 E63 BMW 645ci - Automatic Transmission
2002-3/2005 E65 BMW 745i 745li 760i 760li
Fits BMW Engines including:
N62,N73
This product was last offered at the strikethrough price on
03-20-2026
This product was last offered at the strikethrough price on
05-07-2026
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
This product was last offered at the strikethrough price on
05-07-2026