For 1990-2009 cars

## Engine Coolant Temperature Sensor Replacement 3.8L

### Removal Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Disconnect the engine coolant temperature (ECT) sensor electrical connector (2).

Important: Care must be taken when handling the ECT sensor. damage to the sensor will affect proper operation of the fuel injection system.

3. Remove the ECT sensor.

### Installation Procedure

1. Coat the ECT sensor threads with sealer GM P/N 12346004 or equivalent.
2. Install the ECT sensor into the engine.
3. Tighten the ECT sensor.

Tighten
Tighten the ECT sensor to 25 N·m (18 lb ft).

4. Connect the ECT sensor electrical connector (2).
5. Refill the cooling system. Refer to Cooling System Draining and Filling .

## Engine Coolant Temperature Sensor Replacement 5.7L

### Removal Procedure

1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
3. Remove the number 1 spark plug wire.

Important: Care must be taken when handling the ECT sensor. Damage to the sensor will affect proper operation of the fuel injection system.

4. Remove the ECT sensor.

### Installation Procedure

1. Coat the ECT sensor threads with sealer GM P/N 12346004 or equivalent.
2. Install the ECT sensor.
3. Install the ECT sensor.

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

4. Install the number 1 spark plug wire.
5. Connect the ECT sensor electrical connector.
6. Refill the cooling system. Refer to Cooling System Draining and Filling .