1. Drain the cooling system. Refer to Cooling System Draining and Filling .
2. Remove the intake manifold cover. Refer to Intake Manifold Cover Replacement .
3. Remove the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
4. Disconnect the fuel injector harness electrical connector from the engine coolant temperature (ECT) sensor.



5. Remove the ECT sensor.

Important: Tap out sensor mounting hole in engine head to remove any thread sealant residue. Clean any sealant residue from the old sensor and apply RTV sealant to threads if the old sensor is to be reused.

1. Apply thread sealant GM P/N 12345382 (Canadian P/N 10953489) or equivalent, to the sensor threads.

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 fuel injector harness electrical connector to the ECT sensor.
4. Install the air cleaner outlet duct. Refer to Air Cleaner Outlet Duct Replacement .
5. Install the intake manifold cover. Refer to Intake Manifold Cover Replacement .
6. Fill the cooling system. Refer to Cooling System Draining and Filling .