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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1003 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (6.6L Engine) >> Removal Procedure

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. Remove the right front tire and wheel. Refer to Tire and Wheel Removal and Installation in Tires and Wheels.
  3. Remove the right engine mount. Refer to Engine Mount Replacement - Right in Engine Mechanical - 6.6L (LB7), or Engine Mount Replacement - Right in Engine Mechanical - 6.6L (LLY).
  4. Disconnect the engine coolant heater cord.
    5. Fig 1: View Of Engine Coolant Heater Cord
    GM674570Courtesy of GENERAL MOTORS CORP.
  5. Loosen the coolant heater bolt.
  6. Remove the engine coolant heater from the engine block.
    7. Fig 2: View Of Engine Coolant Heater (6.6L)
    GM663089Courtesy of GENERAL MOTORS CORP.
  7. Do not score the machined surface of the hole.
  8. Grasp the plug with pliers.
  9. Pull the plug from the engine block.
  10. Clean the core plug hole in order to remove the following substances:
    • Burrs
    • Compound
    • Paint
    • Rough spots
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