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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1666 (Heating, Ventilation And Air Conditioning) >> Repair Instruction >> Heater Core Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
  1. For a 3.8L engine, remove the fuel injector sight shield. Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L36) or FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L67) in Engine Mechanical-3.8L.

    Drain the coolant. Refer to DRAINING AND FILLING COOLING SYSTEM in Engine Cooling.

  2. Use J 38185  in order to position aside the heater hose inlet and outlet clamp at the heater core.
  3. Disconnect the inlet and outlet heater hose from the heater core.
    Fig 1: Disconnecting Inlet & Outlet Heater Hose From Heater Core
    G01568822Courtesy of GENERAL MOTORS CORP.
  4. Remove the vacuum tank. Refer to VACUUM TANK REPLACEMENT in HVAC System - Manual.
  5. Remove the floor carpet. Refer to CARPET REPLACEMENT -- FRONT in Interior Trim.
  6. Remove the rear floor air outlet duct from the holes in the floor reinforcement.
  7. Disconnect the rear floor air outlet duct from the heater core outlet cover.
    Fig 2: View Of Heater Core Outlet Cover
    G01568823Courtesy of GENERAL MOTORS CORP.
  8. Remove the bolts from the vacuum harness bracket and position bracket aside.
    IMPORTANT: Position the heater core outlet cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly.
  9. Remove the screws from the heater core outlet cover.
  10. Remove the heater core outlet cover.
  11. Remove the screws from the heater core cover.
  12. Remove the heater core cover.
    Fig 3: Removing Heater Core Cover
    G01568824Courtesy of GENERAL MOTORS CORP.
  13. Remove and discard the seals (1,2) from the heater core cover.
  14. Remove the caulk (3) from the heater core cover.
    Fig 4: Removing Seals From Heater Core Cover
    G01568825Courtesy of GENERAL MOTORS CORP.
  15. Remove and discard the outer seal (5) from the heater core.
    Fig 5: Removing Outer Seal From Heater Core
    G01568826Courtesy of GENERAL MOTORS CORP.
  16. Remove the screw (1) from the heater core support bracket.
  17. Remove the heater core support bracket.
  18. Remove the screw (2) from the heater core pipe retainer clamp.
    Fig 6: Locating Heater Core Support Bracket Retaining Screw
    G01568827Courtesy of GENERAL MOTORS CORP.
  19. Remove the heater core from the HVAC lower case.
    Fig 7: Removing Heater Core From HVAC Lower Case
    G01568828Courtesy of GENERAL MOTORS CORP.
  20. Remove the heater core pipe retainer clamp from the heater core pipes.
  21. Remove and discard the lower seal (4) from the HVAC case.
    Fig 8: Removing Lower Seal From HVAC Case
    G01568829Courtesy of GENERAL MOTORS CORP.
  22. Remove and discard the center seal (3) from the HVAC case.
    Fig 9: Removing Center Seal From HVAC Case
    G01568830Courtesy of GENERAL MOTORS CORP.
  23. Remove and discard the upper seal (2) from the HVAC lower case.
    Fig 10: Removing Upper Seal From HVAC Lower Case
    G01568831Courtesy of GENERAL MOTORS CORP.
  24. Remove and discard the side seals (1) from the HVAC lower case.
    Fig 11: Removing Side Seals From HVAC Lower Case
    G01568832Courtesy of GENERAL MOTORS CORP.
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