BMW Thermostats for BMW G01 X3 xDrive30i B46 2.0L

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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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Water Pump & Thermostat Kit - Gen 1 B46 2.0L
Water Pump & Thermostat Kit - Gen 1 B46 2.0L
For model years 2018-2019
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Packaged by Turner - Corporate Logo
T#:35863149
Part#: 11518638026TKT
Ships on Jul 29, 2026
Sale - Save 5% $ 731.99

This product was last offered at the strikethrough price on
06-30-2026

$ 696.75 USD
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Sale - Save 5%
$ 731.99

This product was last offered at the strikethrough price on
06-30-2026

$ 696.75 USD
Free Shipping on orders $49 and up
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BMW's cooling system has long been a known weak spot, with the water pump and thermostat being two of the most common trouble areas. This remains true even in the latest B-Series engines found in 2016 and newer BMW models. This kit includes a brand-new OEM Pierburg water pump, a Bremmen thermostat (now referred to as a Heat Management Module), and one gallon of BMW's G48 coolant concentrate (enough to make two gallons of 50/50 coolant). Avoid spending thousands at the dealership or over $600 on Genuine BMW parts! These components can be replaced with high-quality OEM parts in just an afternoon using basic hand tools.
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Thermostat - B48
Thermostat - B48
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with the Gen1 B48/B46 only - not compatible with the later Gen2 B48 (TU) engines
Bremmen Parts - Corporate Logo
T#:23648673
Part#: 11537644811
In Stock
Sale - Save 15% $ 223.99

This product was last offered at the strikethrough price on
05-03-2026

$ 190.39 USD
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Sale - Save 15%
$ 223.99

This product was last offered at the strikethrough price on
05-03-2026

$ 190.39 USD
Free Shipping on orders $49 and up
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Genuine BMW - Thermostat with housing and gasket - 11537644811
Genuine BMW - Thermostat with housing and gasket - 11537644811 ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
For vehicles with the Gen1 B48/B46 only - not compatible with the later Gen2 B48 (TU) engines
Genuine BMW - Corporate Logo
T#:539226
Part#: 11537644811
In Stock
Sale - Save 5% $ 544.99

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

$ 517.48 USD
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Sale - Save 5%
$ 544.99

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

$ 517.48 USD
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11537644811 - Thermostat with housing and gasket. The thermostat controls the flow of coolant based on temperatures in the engine. This is a crucial component to your cooling system and making sure your car is operating properly.
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Genuine BMW Coolant Thermostat Module - BMW G20 G22/23 G30 B48 2.0L
Genuine BMW Coolant Thermostat Module - BMW G20 G22/23 G30 B48 2.0L ...
For models with the B48D, B46D, or B46X engines only - Not for the earlier Gen1 or late...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:617367
Part#: 11538642560
In Stock
6% off MSRP $ 446.99

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

$ 419.99 USD
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6% off MSRP
$ 446.99

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

$ 419.99 USD
Free Shipping on orders $49 and up
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Modern BMW thermostats are electronically controlled, allowing the DME/ECU to directly regulate coolant flow throughout the engine and its components. This system enables the thermostat to operate based on a broader range of temperature inputs, such as coolant, cylinder head, engine block, and oil temperatures, for more refined control of engine warm-up and temperature across diverse conditions. Unlike traditional thermostats, which simply open or close to permit coolant flow, this system uses a rotary valve for more dynamic control. The rotary valve adjusts to various positions, allowing for partial or full coolant flow to designated passageways as needed. This precision control helps your BMW's engine reach optimal temperatures quickly and ensures efficient heat management under various driving conditions.
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BMW B46 B48 Thermostat With Housing And Gasket
BMW B46 B48 Thermostat With Housing And Gasket
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
2X Entries For Our G87 M2 Sweepstakes! We Price Match - Give Us A Call or Chat! For vehicles with the Gen1 B48/B46 only - not compatible with the later Gen2 B48 (TU) engines
URO - Corporate Logo
T#:27372124
Part#: 11537644811
Back Ordered
$ 265.99 USD
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$ 265.99 USD
Free Shipping on orders $49 and up
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BMW B46 B48 Thermostat With Housing And Gasket is an essential component for maintaining optimal engine performance and cooling efficiency. This high-quality thermostat comes complete with housing and gasket, ensuring a precise fit and reliable operation.

The thermostat plays a crucial role in regulating the flow of coolant based on engine temperature. By controlling this flow, it helps maintain the engine at its optimal operating temperature, preventing overheating and ensuring efficient performance.

  • Complete Assembly: Includes thermostat, housing, and gasket for easy installation.
  • Optimal Cooling: Regulates coolant flow to maintain proper engine temperature.
  • Enhanced Performance: Ensures your engine operates within its ideal temperature range.
  • Durable Construction: Made with high-quality materials for long-lasting reliability.

Ensure your BMW's cooling system is functioning correctly with this reliable thermostat assembly from Turner Motorsport.

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Genuine BMW Water Pump & Thermostat Kit - Gen 1 B46 2.0L
Genuine BMW Water Pump & Thermostat Kit - Gen 1 B46 2.0L
For model years 2018-2019
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Genuine BMW - Corporate Logo
T#:35863148
Part#: 11518638026KT
Ships in 4 Business Days
$ 754.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 754.99 USD
Free Shipping on orders $49 and up
Add to Wish List
The cooling system has always been a weak point for BMW. Two of the biggest issues are the water pump and thermostat. This continues to be true even on the newest B-Series engines found in 2016+ BMWs. This kit includes a brand new Genuine BMW water pump, a new thermostat (now referred to as a Heat Management Module), and 1 gallon of BMW's G48 coolant concentrate (makes 2 gallons of 50/50 coolant). Don't spend thousands of dollars at the dealership, these can easily be replaced in an afternoon with basic mechanic's tools.
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Rein Thermostat Assembly - F Chassis, G-Chassis - B48
Rein Thermostat Assembly - F Chassis, G-Chassis - B48
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Rein - Corporate Logo
T#:53891628
Part#: 11537644811
Ships in 3 Business Days
New Item
Sale - Save 15% $ 322.99

This product was last offered at the strikethrough price on
06-10-2026

$ 274.43 USD
Add to Wish List
Sale - Save 15%
$ 322.99

This product was last offered at the strikethrough price on
06-10-2026

$ 274.43 USD
Add to Wish List
Whether you're managing a fleet of "spirited" daily drivers or prepping a chassis for the circuit, the Rein CTA0079 offers the peace of mind that comes with OE-quality engineering.
VEMO Coolant Thermostat Assembly - BMW G20 G22/23 G30 B48 2.0L
VEMO Coolant Thermostat Assembly - BMW G20 G22/23 G30 B48 2.0L ...
affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms
Vemo - Corporate Logo
T#:49578587
Part#: V20-99-1310
Special Order: No Guaranteed ETA
New Item
$ 182.99 USD
Free Shipping on orders $49 and up
Add to Wish List
$ 182.99 USD
Free Shipping on orders $49 and up
Add to Wish List
Modern BMW thermostats are electronically controlled, allowing the DME/ECU to directly regulate coolant flow throughout the engine and its components. This system enables the thermostat to operate based on a broader range of temperature inputs, such as coolant, cylinder head, engine block, and oil temperatures, for more refined control of engine warm-up and temperature across diverse conditions. Unlike traditional thermostats, which simply open or close to permit coolant flow, this system uses a rotary valve for more dynamic control. The rotary valve adjusts to various positions, allowing for partial or full coolant flow to designated passageways as needed. This precision control helps your BMW's engine reach optimal temperatures quickly and ensures efficient heat management under various driving conditions.
Show More Show Less

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