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 intake manifold tube. Refer to Intake Manifold Tube Replacement .
2. Drain the coolant to a level below the engine coolant temperature (ECT) sensor. Refer to Cooling System Draining and Filling .
3. Disconnect the engine wiring harness electrical connector (1) from the ECT sensor.



4. Remove the ECT sensor (1).

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

1. If installing the old sensor, coat the threads with sealant GM P/N 12346004 (Canadian P/N 10953480), or equivalent.

Notice: Refer to Fastener Notice in the Preface section.

2. Install the ECT sensor (1).

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




3. Connect the engine wiring harness electrical connector (1) to the ECT sensor.
4. Fill the cooling system, if necessary. Refer to Cooling System Draining and Filling .
5. Install the intake manifold tube. Refer to Intake Manifold Tube Replacement .