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Home >> GMC >> 2009 >> Envoy 4.2 S, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 4.2L - Introduction >> Repair Instructions >> Engine Coolant Temperature Sensor Replacement >> Removal Procedure

Removal Procedure

    CAUTION: 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. WARNING: Refer to Battery Disconnect Warning .
  2. Disconnect the negative battery terminal.
  3. Drain coolant below the level of the engine coolant temperature (ECT) sensor. Refer to Cooling System Draining and Filling (LL8) or Cooling System Draining and Filling (LH6, LS2) .
  4. Disconnect the ECT sensor electrical connector (1).
    5. Fig 1: Identifying ECT Sensor
    GM1713326Courtesy of GENERAL MOTORS CORP.
  5. Carefully remove the ECT sensor (1).
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