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

1. Drain the cooling system. Refer to Cooling System Draining and Filling.
2. Remove the intake manifold cover, if necessary. Refer to Intake Manifold Cover Replacement.
3. Remove the exhaust crossover. Refer to Exhaust Crossover Pipe Replacement.
4. Disconnect the engine coolant temperature (ECT) sensor electrical connector.
5. Remove the ECT sensor.

Caution: Replacement components must be the correct part number for the application. Components requiring the use of the thread locking compound, lubricants, corrosion inhibitors, or sealants are identified in the service procedure. Some replacement components may come with these coatings already applied. Do not use these coatings on components unless specified. These coatings can affect the final torque, which may affect the operation of the component. Use the correct torque specification when installing components in order to avoid damage.

1. Coat the threads of the ECT sensor with sealer GM P/N 13246004 (Canadian P/N 10953480) or equivalent.

Caution: Refer to Fastener Caution in the Preface section.

2. Install the ECT sensor.

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

3. Connect the ECT electrical connector.
4. Install the intake manifold cover, if necessary. Refer to Intake Manifold Cover Replacement.
5. Install the exhaust crossover. Refer to Exhaust Crossover Pipe Replacement.
6. Fill the cooling system. Refer to Cooling System Draining and Filling.