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Removal Procedure

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 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 (without HP2) .
  2. Disconnect the heater cord from the coolant heater (4).
    3. Fig 1: View Of Coolant Heater (4.3L)
    GM312949Courtesy of GENERAL MOTORS CORP.
  3. Loosen the coolant heater bolt.
  4. Remove the coolant heater from the engine block.
  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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