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

ENGINE COOLANT TEMPERATURE (ECT) SENSOR REPLACEMENT

REMOVAL PROCEDURE

NOTE: 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. Drain the coolant below the level of the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System in Cooling System.
3. Disconnect the sensor electrical connector.




4. Carefully remove the ECT sensor.

INSTALLATION PROCEDURE




1. Coat the threads with sealer GM P/N 9985253 or equivalent.

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

2. Install the ECT sensor.

NOTE:
- 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.
- Refer to Fastener Notice in Service Precautions.

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

3. Connect the ECT harness connector to the ECT sensor.
4. Refill the cooling system. Refer to Draining and Filling Cooling System in Cooling System.