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. Remove the fuel injector sight shield.
2. Drain the cooling system. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (Vac-N-Fill).
3. Disconnect the engine harness electrical connector (6) from the engine coolant temperature (ECT) sensor.




4. Remove the ECT sensor.

Installation Procedure

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

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.




1. Apply sealant GM P/N 12346004 (Canadian P/N 10953480) or equivalent to the threads of the ECT sensor.
2. Install the ECT sensor.

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




3. Connect the engine harness electrical connector (6) to the ECT sensor.
4. Fill the cooling system. Refer to Draining and Filling Cooling System (Static Fill) Draining and Filling Cooling System (Vac-N-Fill).
5. Install the fuel injector sight shield.