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

ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT

REMOVAL PROCEDURE





1. Turn the ignition OFF.

IMPORTANT: Engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor.

2. Disconnect the ECT sensor harness connector.
3. Remove the ECT (1).

INSTALLATION PROCEDURE

IMPORTANT: Tap out the sensor mounting hole in the engine head to remove any thread sealant residue. Clean any sealant residue from the old sensor and apply the RTV sealant to threads if old the sensor is going to be reused.




1. Apply the thread sealant GM P/N 21485227, LOCTITE 242(R) Threadlocker or equivalent to the sensor threads.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the ECT sensor (1).

Tighten the engine coolant temperature sensor to 20 N.m (15 lb ft).

3. Connect the ECT sensor harness connector. Push in the connector until a click is heard, then pull back to confirm a positive engagement.
4. Fill the engine coolant to the proper level.