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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1620 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (4.8L, 5.3L, and 6.0L Engines) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the cooling system. Refer to Draining and Filling Cooling System .
  2. Raise and suitably support the vehicle. Refer to JACKING AND LIFTING .
  3. Disconnect the coolant heater electrical connector (2).
    Fig 1: Disconnect Coolant Heater Electrical Connector
    G02109271Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Do not score the surface of the engine block hole when removing the coolant heater.
  4. Remove the coolant heater from the engine block.
  5. Remove any burrs, sealer, paint or other rough spots.
    Fig 2: Remove Coolant Heater
    G02109272Courtesy of GENERAL MOTORS CORP.
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