Envoy, Rainer, Trailblazer 2006-2007

Removal & Installation

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4.2L Engine




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

  1. Turn the engine OFF.
  2.  
  3. Disconnect the negative battery terminal.
  4.  
  5. Drain coolant below the level of the Engine Coolant Temperature (ECT) sensor.
  6.  
  7. Disconnect the ECT sensor electrical connector (1).
  8.  
  9. Carefully remove the ECT sensor (1).

    Click image to see an enlarged view

    Fig. Engine Coolant Temperature (ECT) sensor-4.2L engine

  10.  

To install:

  1. If installing the original sensor or a new sensor without sealant, apply thread sealer P/N 12346004 or equivalent.
  2.  
  3. Install the ECT sensor and tighten to 12 ft. lbs. (16 Nm).
  4.  
  5. Connect the ECT electrical connector (1).
  6.  
  7. Connect the negative battery terminal.
  8.  
  9. Refill the engine coolant.
  10.  

5.3L & 6.0L Engines




WARNING
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.  
  3. Raise and suitably support the vehicle.
  4.  
  5. Drain the cooling system below the level of the Engine Coolant Temperature (ECT) sensor.
  6.  
  7. Lower the vehicle.
  8.  
  9. Disconnect the ECT sensor electrical connector (1).
  10.  
  11. Remove the ECT sensor.

    Click image to see an enlarged view

    Fig. Engine Coolant Temperature (ECT) sensor-5.3L and 6.0L engines

  12.  

To install:

  1. Coat the ECT sensor threads with sealer GM P/N 12346004 (Canadian P/N 10953480), or equivalent.
  2.  
  3. Install the ECT sensor and tighten to 15 ft. lbs. (20 Nm).
  4.  
  5. Connect the ECT sensor electrical connector (1).
  6.  
  7. Refill the engine coolant.
  8.  

 
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