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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 862 (Engine Cooling System) >> Repair Instructions >> Coolant Heater Replacement (LMM) >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Engine Coolant Heater Cord
    GM674570Courtesy of GENERAL MOTORS CORP.
  1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill)  or Cooling System Draining and Filling (Vac-N-Fill) .
  2. Remove the right front tire and wheel. Refer to Tire and Wheel Removal and Installation .
  3. Remove the right engine mount. Refer to Engine Mount Replacement - Right Side .
  4. Disconnect the engine coolant heater cord.
    5. Fig 2: View Of Engine Block Heater
    GM663089Courtesy of GENERAL MOTORS CORP.
  5. Loosen the coolant heater bolt.
  6. Remove the engine coolant heater from the engine block.
  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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