TrailBlazer 2WD V8-5.3L (2007)
Coolant Temperature Sensor/Switch (For Computer): Service and Repair
Engine Coolant Temperature Sensor Replacement
Removal Procedure
Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Turn OFF the ignition.
2. Raise and suitably support the vehicle. Refer to Vehicle Lifting.
3. Drain the cooling system below the level of the ECT sensor. Refer to Draining and Filling Cooling System (LL8) Draining and Filling Cooling
System (LH6, LS2).
4. Lower the vehicle.
5. Disconnect the engine coolant temperature (ECT) sensor electrical connector (1).
6. Remove the ECT sensor.
Installation Procedure
Notice: 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.
Notice: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent.
