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

Engine Coolant Temperature Sensor Replacement

Removal Procedure




1. Drain the engine coolant to a level below the engine coolant temperature (ECT) sensor. Refer to Cooling System Draining and Filling (LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ Static Fill) (Service and Repair)Cooling System Draining and Filling (LY7 Static Fill) (Service and Repair).
2. Remove the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).
3. Disconnect the ECT sensor harness connector.
4. Remove the ECT sensor.

Installation Procedure





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

1. If the sensor is being reused, apply thread sealant GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to sensor threads.

Caution: Refer to Component Fastener Tightening Caution (Component Fastener Tightening Caution).

2. Install the ECT sensor.

Tighten the sensor to 23 Nm (17 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. Install the fuel injector sight shield. Refer to Fuel Injector Sight Shield Replacement (Service and Repair).
5. Fill the engine cooling system to proper level. Refer to Cooling System Draining and Filling (LY7 GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ GE 47716 Fill) (Service and Repair)Cooling System Draining and Filling (LNJ Static Fill) (Service and Repair)Cooling System Draining and Filling (LY7 Static Fill) (Service and Repair).