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

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. Relieve the engine coolant pressure.
3. Drain the engine coolant. Refer to Draining and Filling Cooling System in Cooling System.
4. Disconnect the electrical connector.
5. Use a deep well socket and extension in order to remove the Engine Coolant Temperature (ECT) sensor.

INSTALLATION PROCEDURE
1. Coat the ECT sensor threads with sealer GM P/N 9985253, or equivalent.

NOTE: Refer to Fastener Notice in Service Precautions.

2. Install the sensor in engine.

Tighten
Tighten the sensor to 23 N.m (17 lb ft).

3. Connect the electrical connector.
4. Refill the engine coolant to the proper level.
5. Start the engine.
6. Check for coolant leaks.