Coolant Temperature Sensor/Switch (For Computer): Service and Repair

WARNING
Be careful if the car is warm. The coolant is hot and there is a risk of burns from the intake manifold.

To remove
1 Carefully loosen the coolant expansion tank cap (to release any pressure) and then screw it back on.





2 Unplug the connector and remove the sensor using a 19 mm dog-leg spanner.

To fit





1 Fit the sensor. Lubricate the threads with Vaseline (part no.30 20 271) or equivalent. Fit a new sealing washer as necessary. Spray the connector with Kontakt 61 (part no.30 04 520) and connect it to the sensor.
Tightening torque 13 Nm (9.6 lbf ft)
2 Top up with coolant as necessary after fitting.
Start the engine. Make sure there are no leaks. Top up with coolant as necessary.