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Home >> GMC >> 2004 >> Sierra 2500 HD, 2D Pickup, 8.1 G, RWD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 8.1L (Introduction) >> Repair Instructions >> Engine Coolant Temperature (ECT) Sensor Replacement >> Removal Procedure

Removal Procedure

NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
  1. Drain the cooling system to a level below the engine coolant temperature (ECT) sensor. Refer to Draining and Filling Cooling System (with HP2) or Draining and Filling Cooling System (without HP2) in Engine Cooling.
    Fig 1: View Of Ignition Coil, ECT And MAP Sensor Electrical Connectors
    GM750529Courtesy of GENERAL MOTORS CORP.
  2. Disconnect the ECT sensor electrical connector (3).
    3. Fig 2: Locating ECT Sensor Electrical Connector At Oil Fill Tube Bracket
    GM858201Courtesy of GENERAL MOTORS CORP.
  3. Remove the ECT sensor electrical connector from the oil fill tube bracket.
    4. Fig 3: Locating ECT Sensor
    GM858203Courtesy of GENERAL MOTORS CORP.
  4. Remove the ECT sensor.
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