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

Engine Coolant Temperature Sensor Replacement

Removal Procedure

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

1. Turn OFF the ignition.




2. Raise the vehicle. Refer to Lifting and Jacking the Vehicle (Service and Repair).
3. Drain the cooling system below the level of the ECT sensor. Refer to Cooling System Draining and Filling (Static Fill) (Cooling System Draining and Filling (Static Fill)) Cooling System Draining and Filling (Vac N Fill) (Cooling System Draining and Filling (Vac N Fill)).
4. Lower the vehicle.
5. Disconnect the electrical connector from the engine coolant temperature (ECT) sensor.




6. Remove the ECT sensor.

Installation Procedure

Caution: 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.

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

1. If reusing the ECT sensor, coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480) or the equivalent.





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

2. Install the ECT sensor and tighten to 20 Nm (15 lb ft).




3. Connect the ECT sensor electrical connector.
4. Refill the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) (Cooling System Draining and Filling (Static Fill)) Cooling System Draining and Filling (Vac N Fill) (Cooling System Draining and Filling (Vac N Fill)).