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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 688 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (4.3L Engine) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 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 & Filling Cooling System .
  2. Disconnect the heater cord from the coolant heater (4).
  3. Loosen the bolt retaining the coolant heater to the block.
  4. Remove the coolant heater from the engine block.
    5. Fig 1: Coolant Heater
    G01658208Courtesy of GENERAL MOTORS CORP.
  5. Do not score the machined surface of the hole.
  6. Grasp the plug with pliers.
  7. Pull the plug from the engine block.
  8. Clean the core plug hole in order to remove the following substances:
    • Burrs
    • Compound
    • Paint
    • Rough spots
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