Could a faulty thermostat be the cause of engine overheating or running too cool on 2006 BMW X3?

Even if the thermostat is being mechanical, if the temperate of the engine is seemed high or low and there is not other test that is involved in the checking of cooling system, then the thermostat may have a problem. Through the OBD II, the electrically heated thermostat is checked. It may be the problem with the software or the hardware of the DME or the wiring of thermostat might be an issue.

Genuine 2006 BMW X3 Thermostat

Engine Coolant Thermostat

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2 Thermostats found

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2006 BMW X3 Thermostat Housing Sensor
Part Number: 11537509227
$123.30 MSRP: $174.45
You Save: $51.15 (30%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Thermostat Housing With Thermostat
- Replaces: 11-53-0-139-877
- Item Weight: 1.20 Pounds
- Item Dimensions: 8.8 x 6.9 x 5.9 inches
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 11537509227
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
More Info
Fits the following 2006 BMW X3 Submodels:
- 2.5i(E83), 3.0i(E83)
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2006 BMW X3 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
- Item Weight: 0.70 Pounds
- Condition: New
- Fitment Type: Direct Replacement
- SKU: 17111437362
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following 2006 BMW X3 Submodels:
- 2.5i(E83), 3.0i(E83)

2006 BMW X3 Thermostat

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2006 BMW X3 Thermostat Parts Questions & Experts Answers

Q:
Could a faulty thermostat be the cause of engine overheating or running too cool on 2006 BMW X3?
Posted by Moshe K.
A:
Even if the thermostat is being mechanical, if the temperate of the engine is seemed high or low and there is not other test that is involved in the checking of cooling system, then the thermostat may have a problem. Through the OBD II, the electrically heated thermostat is checked. It may be the problem with the software or the hardware of the DME or the wiring of thermostat might be an issue.
Answered by BMW Parts Specialist Blaine / Oct 17, 2025