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

Caution: Unless directed otherwise, the ignition and start switch must be in the OFF or LOCK position, and all electrical loads must be OFF before servicing any electrical component. Disconnect the negative battery cable to prevent an electrical spark should a tool or equipment come in contact with an exposed electrical terminal. Failure to follow these precautions may result in personal injury and/or damage to the vehicle or its components.

1. Disconnect the negative battery cable.



2. Loosen the wingnuts on the air cleaner cover and air cleaner outlet duct.
3. Move the air intake assembly aside.

Caution: Allow sufficient time for the engine to cool before removing the ECT sensor. A hot engine may cause an excessive coolant loss or a personal injury.

4. Relieve the coolant pressure.
5. Drain the cooling system below the level of the sensor. Refer to Cooling System Draining and Filling in Engine Cooling.



6. Disconnect the ECT sensor electrical connector.



7. Remove the ECT sensor.

1. Coat the threads (only) with GM P/N 12346004 sealer or equivalent.




Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

2. Install the ECT sensor in the engine.

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




3. Connect the ECT sensor electrical connector.
4. Refill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.



5. Install the air intake assembly and tighten the wing nuts.
6. Connect the negative battery cable.