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

REMOVAL PROCEDURE

CAUTION: Refer to Battery Disconnect Caution in Service Precautions.

1. Disconnect the negative battery cable.
2. Remove the engine cover.

CAUTION: To avoid being burned, do not remove the radiator cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if radiator cap or surge tank cap is removed while the engine and radiator are still hot.

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

3. Relieve the coolant pressure.
4. Drain the cooling system below the level of the sensor. Refer to Draining and Filling Cooling System in Cooling System.




5. Disconnect the ECT sensor harness connector.




6. Remove the ECT sensor.

INSTALLATION PROCEDURE




1. Coat the threads (only) with GM P/N9985253 sealer or equivalent.

NOTE: Refer to Component Tightening Notice in Service Precautions.

2. Install the ECT sensor in the engine.

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




3. Connect the ECT sensor harness connector.
4. Refill the cooling system. Refer to Draining and Filling Cooling System in Cooling System.
5. Install the engine cover.
6. Connect the negative battery cable.