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Home >> GMC >> 2002 >> C3500 HD 8.1 G, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - 8.1L >> Repair Instructions >> Engine Coolant Temperature (ECT) Sensor Replacement >> Installation Procedure
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Installation Procedure

NOTE: Use care when handling the coolant sensor. Damage to the coolant sensor will affect the operation of the fuel control system.
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.
  1. Coat the threads with sealer P/N 9985253 or equivalent.
    NOTE: Refer to FASTENER NOTICE in Cautions and Notices.
  2. Install the ECT sensor (3).

    Tighten 

    Tighten the ECT sensor to 20 N.m (15 lb ft).

  3. Connect the ECT electrical connector to the bracket (1).
  4. Connect the ECT harness connector (2) to the ECT sensor (3).
  5. Refill the cooling system. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.
    Fig 1: ECT Electrical Connect, Sensor & Bracket
    G01598873Courtesy of GENERAL MOTORS CORP.
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