Engine - Coolant Temperature Sensor/Switch: Service and Repair

Engine Coolant Temperature Sensor (G62)

Removing

• Engine cold.

- Briefly open the coolant reservoir cap to reduce the residual pressure in the coolant system.






- Loosen the hose clamps - arrows - and remove the air guide hose.

• Ignore - 1 -.

- Disconnect the connector - 1 - from the throttle valve control module (J338).






- Remove bolts - arrows - and remove throttle valve control module.

- Remove the intake manifold support; to do this, remove the nut - 2 - and bolt - 1 -.






• Different Engine Coolant Temperature (ECT) sensor (G62) may be installed, depending on the version.

Inserted Version






- Disconnect the connector - 1 - from the ECT sensor.

• Use a cloth to catch any leaking coolant.

- Press the locking mechanisms - arrows - and remove the clamp.

- Remove the ECT sensor - 2 -.

Threaded Version






- Disconnect the connector - 2 - from the ECT sensor.

• Use a cloth to catch any leaking coolant.

- Remove the bolts - arrows - and the retaining plate - 1 -.

- Remove the ECT sensor.

Installing

Install in reverse order of removal. Note the following:

• Tightening specifications, refer to => [ Coolant Pump and Thermostat Overview ] Coolant Pump and Thermostat Overview.

• Replace the O-rings.

• To prevent coolant loss, immediately insert new ECT sensor in connecting pieces.

• The hose connections as well as the air guide pipes and hoses must be free of oil and grease before installing.

• Secure all hose connections with hose clamps of the same type as those equipped by the factory. Refer to the Parts Catalog.

• In order to be able to securely mount the air guide hoses on their connectors, spray the screws on the previously used clamps with a rust remover.

- Install the intake manifold support.

- Install the throttle valve control module.

- Check the coolant level => [ Filling ] Service and Repair.