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

ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT

REMOVAL PROCEDURE
1. Engine coolant must be drained below the level of the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (GE 47716 Fill) in Cooling System.




2. Disconnect the ECT sensor harness connector.
3. Remove the ECT sensor.

INSTALLATION PROCEDURE




1. Apply thread sealant GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to sensor threads.

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

2. Install the ECT sensor.

Tighten the engine coolant temperature sensor to 23 N.m (17 lb ft).

NOTE: Refer to Component Fastener Tightening Notice in Service Precautions.

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 engine coolant to proper level. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (GE 47716 Fill) in Cooling System.