How to remove and install the Thermostat on BMW 330i?

Remove the fasteners and the engine splash shield. Drain the cooling system. Release the clamps/pry out the clips and disconnect the four coolant hoses from the thermostat housing, which is located above the coolant pump at the front right-hand corner of the cylinder block. Disconnect the electrical connector from the base of the thermostat housing. Remove the mounting bolts and the thermostat housing. Note: The thermostat and housing are only available as a complete unit. Installation is the reverse of removal, bearing in mind the following points. Replace the thermostat cover/housing O-ring seal. Tighten the thermostat cover/housing bolts to the specified torque where given. Refill the cooling system.

Genuine BMW 330i Thermostat

Engine Coolant Thermostat

Select Vehicle by Model
Select Vehicle by VIN

Select Vehicle by Model

Series

Model

Year

Select Vehicle by VIN

For the most accurate results, select vehicle by your VIN (Vehicle Identification Number).

4 Thermostats found

View related parts
BMW 330i Thermostat
Part Number: 11537549476
$216.45 MSRP: $316.79
You Save: $100.34 (32%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Housing, Thermostat Unit
- Replaces: 11-53-7-544-788, 11-53-7-536-655
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2006 BMW 330i | Sedan(E90)
View related parts
BMW 330i Thermostat Housing Sensor
Part Number: 11537509227
$123.30 MSRP: $174.45
You Save: $51.15 (30%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Housing With Thermostat
- Replaces: 11-53-0-139-877
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 330i | Sedan(E46)
View related parts
BMW 330i Oil Cooler Thermostat
Part Number: 17111437362
$107.87 MSRP: $134.39
You Save: $26.52 (20%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat; Temperature Switch
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2001-2005 BMW 330i | Sedan(E46)
View related parts
BMW 330i Automatic Transmission Oil Cooler Thermostat
Part Number: 17228678822
$148.22 MSRP: $216.93
You Save: $68.71 (32%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat; Thermostat Unit
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2025 BMW 330i | 4 Cyl 2.0 L GAS, 4 Cyl 2.0 L MILD HYBRID EV-GAS (MHEV), Sedan(G20)

BMW 330i Thermostat

The BMW 330i Thermostat maintains the engine at its optimum temperature by opening up to mix hot internal coolant with cooler liquid from the radiator after heat is generated beyond a predetermined limit to avoid overheating and ensure steady performance. Early 330i models applied a simple mechanical Thermostat based around a wax pellet that would react to the heat. It would expand with the temperature so that the heat from the wax would push a valve open, allowing coolant to pass between the inner and outer cooling loops. Later 330i editions applied the same proven wax-based mechanism as the fast response and reliability suited the compact, high-revving nature of the car. This BMW strategy evades providing extra sensors because the Thermostat itself reacts instantly. Regardless of the production year, the device is located near the radiator where it monitors coolant warmth at all times, closing once again when the liquid becomes cool to accelerate engine warm-up for greater efficiency. If the Thermostat becomes stuck in a closed position, the circulation of coolant stops, the heat begins to rise rapidly, potentially causing serious damage to the engine. Drivers watching the temperature gauge can notice the problem early. Regular checks are performed to make sure every BMW 330i retains the cooling precision of the factory with the help of its tiny but crucial Thermostat.

If you are looking for OEM BMW 330i Thermostat, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW 330i Thermostat that come backed by the manufacturer's warranty.

BMW 330i Thermostat Parts Questions & Experts Answers

Thermostat
11537549476
Q:
How to remove and install the Thermostat on BMW 330i?
Posted by Ronald O.
A:
Remove the fasteners and the engine splash shield. Drain the cooling system. Release the clamps/pry out the clips and disconnect the four coolant hoses from the thermostat housing, which is located above the coolant pump at the front right-hand corner of the cylinder block. Disconnect the electrical connector from the base of the thermostat housing. Remove the mounting bolts and the thermostat housing. Note: The thermostat and housing are only available as a complete unit. Installation is the reverse of removal, bearing in mind the following points. Replace the thermostat cover/housing O-ring seal. Tighten the thermostat cover/housing bolts to the specified torque where given. Refill the cooling system.
Answered by BMW Parts Specialist Tony / Feb 26, 2026