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

Engine Coolant Temperature Sensor Replacement

Removal Procedure

Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.




1. Drain the cooling system below the level of the engine coolant temperature (ECT) sensor. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) Cooling System Draining and Filling (LZE, LZ4, LZG, 9C1, 9C3, GE47716 Fill) Cooling System Draining and Filling (LZE, LZ4, LZG, Static Fill).
2. Disconnect the ECT sensor electrical connector (1).




3. Remove the ECT sensor.

Installation Procedure

Notice: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.




1. Coat the thread of the ECT sensor with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent.

Notice: Refer to Fastener Notice.

2. Install the ECT sensor.

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




3. Connect the ECT sensor electrical connector (1).
4. Refill the engine coolant. Refer to Cooling System Draining and Filling (9C1, 9C3 Static Fill) Cooling System Draining and Filling (LZE, LZ4, LZG, 9C1, 9C3, GE47716 Fill) Cooling System Draining and Filling (LZE, LZ4, LZG, Static Fill).