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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1319 (Heating, Ventilation & Air Conditioning) >> Repair Instructions >> Heater Core Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2002 Pontiac Grand Prix. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the fuel injector sight shield (3.8L only). Refer to FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L36) or FUEL INJECTOR SIGHT SHIELD REPLACEMENT (L67) .
  2. Drain the coolant. Refer to DRAINING AND FILLING COOLING SYSTEM .
  3. Use J 38185  in order to position aside the heater hose inlet and outlet clamps at the heater core (3.1L).
  4. Disconnect the inlet and outlet heater hose from the heater core (3.1L).
    Fig 1: Inlet & Outlet Heater Hoses & Clamps
    G01672853Courtesy of GENERAL MOTORS CORP.
  5. Use J 38185  in order to position aside the heater hose inlet and outlet clamps at the heater core (3.8L).
  6. Disconnect the inlet and outlet heater hose from the heater core (3.8L).
  7. Remove the lower the floor console. Refer to CONSOLE REPLACEMENT -- FRONT FLOOR .
  8. Remove the right instrument panel insulator. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- RIGHT .
  9. Remove the left instrument panel insulator. Refer to CLOSEOUT/INSULATOR PANEL REPLACEMENT -- LEFT .
    Fig 2: Inlet & Outlet Heater Hoses & Clamps
    G01672854Courtesy of GENERAL MOTORS CORP.

    Important:  Position the heater core outlet cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly.

  10. Remove the heater core outlet cover screws.
  11. Remove the heater core outlet cover.
    Fig 3: Heater Core Outlet Cover
    G01672855Courtesy of GENERAL MOTORS CORP.
  12. Remove the heater core cover screws.
  13. Remove the heater core cover.
    Fig 4: Heater Core Cover & Screws
    G01672856Courtesy of GENERAL MOTORS CORP.
  14. Remove and discard the seals (1,2) from the heater core cover.
  15. Remove the caulk (3) from the heater core cover.
    Fig 5: Heater Core Cover, Seals & Caulk
    G01672857Courtesy of GENERAL MOTORS CORP.
  16. Remove and discard the heater core outer seal (5) from the heater core.
    Fig 6: Heater Core Outer Seal
    G01672858Courtesy of GENERAL MOTORS CORP.
  17. Remove the heater core clamp screw (1).
  18. Remove the heater core retaining clamp.
  19. Remove the heater core pipe retainer clamp screw (2).
    Fig 7: Heater Core Clamp Screw & Core Pipe Clamp Screw
    G01672859Courtesy of GENERAL MOTORS CORP.
  20. Remove the heater core from the HVAC lower case.
    Fig 8: Heater Core
    G01672860Courtesy of GENERAL MOTORS CORP.
  21. Remove and discard the heater core lower seal (4) from the HVAC case.
    Fig 9: Heater Core Lower Seal
    G01672861Courtesy of GENERAL MOTORS CORP.
  22. Remove and discard the heater core center seal (3) from the HVAC case.
    Fig 10: Heater Core Center Seal
    G01672862Courtesy of GENERAL MOTORS CORP.
  23. Remove and discard the heater core upper seal (2) from the HVAC lower case.
    Fig 11: Heater Core Upper Seal From HVAC Lower Case
    G01672863Courtesy of GENERAL MOTORS CORP.
  24. Remove and discard the heater core side seals (1) from the HVAC lower case.
    Fig 12: Heater Core Side Seals From HVAC Lower Case
    G01672864Courtesy of GENERAL MOTORS CORP.
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