Removal Procedure

Fig 1: Identifying ECT Sensor

Courtesy of GENERAL MOTORS CORP.

Partially drain the cooling system to a level below the engine coolant temperature (ECT) sensor. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac N Fill) .
Disconnect the engine wiring harness electrical connector (1) from the ECT sensor electrical connector.
Remove the ECT sensor electrical connector from the camshaft cover.

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

Using the J 45861 (2) carefully remove the ECT sensor (3) from the cylinder head.