1. Drain the cooling system to a level below the engine cooling temperature (ECT) sensor.

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

2. Disconnect the engine wiring harness electrical connector from the ECT sensor.



3. Remove the ECT sensor.

Component Fastener Tightening Notice

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.

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

3. Connect the engine wiring harness electrical connector to the ECT sensor.
4. Refill the cooling.