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Home >> GMC >> 2006 >> Sierra 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 222 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Heater Core Replacement >> Removal Procedure

Removal Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2003 GMC Savana Special, 2003 GMC Savana Camper Special, 2003 GMC Savana, 2003 Chevrolet RV Cutaway, and 2003 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
  1. Drain the engine coolant. Refer to Draining and Filling Cooling System in Engine Cooling .
  2. Remove the hose clamps using the J-39529  .
  3. Remove the inlet and outlet heater hoses from the heater core.
    Fig 1: Removing Hose Clamps Using J-39529
    G01217001Courtesy of GENERAL MOTORS CORP.
  4. Remove the screws from the heater assembly.
  5. CAREFULLY open the heater core access door in order to cut the heater core access door.
  6. Cut the marked section of the heater core access door.
    Fig 2: Removing Heater Assembly
    G01217002Courtesy of GENERAL MOTORS CORP.
  7. Remove the retainers from the heater core.
  8. Remove the heater core.
    Fig 3: Removing Heater Core
    G01217003Courtesy of GENERAL MOTORS CORP.
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