Turn ignition off. Drain the cooling system to below the Engine Coolant Temperature (ECT) sensor. See Fig. 10 . Disconnect the ECT sensor electrical connector. Carefully remove the ECT sensor.
Fig. 10: Locating Engine Coolant Temperature Sensor
Courtesy of GENERAL MOTORS CORP.
NOTE: 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. Use care when handling the coolant sensor. Damage to the coolant sensor
will affect the operation of the fuel control system.
Coat the ECT sensor threads with Thread Sealer (9985253) or the equivalent. Install the ECT sensor. Tighten the ECT sensor to specification. See TORQUE SPECIFICATIONS . Connect the ECT sensor electrical
connector. Refill the engine coolant system. See COOLING SYSTEM BLEEDING under COOLING SYSTEM.
Thursday, October 18th, 2012 AT 5:00 PM