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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1233 (Heating, Ventilation And Air Conditioning) >> Repair Instructions >> Heater Core Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2003 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.
    Fig 1: Identifying Inlet & Outlet Heater Hose Clamps
    G01482215Courtesy of GENERAL MOTORS CORP.
  4. Disconnect the inlet and outlet heater hose from the heater core.
  5. Remove the vacuum tank. Refer to VACUUM TANK REPLACEMENT .
  6. Remove the floor carpet. Refer to CARPET REPLACEMENT - FRONT .
  7. Remove the rear floor air outlet duct from the holes in the floor reinforcement.
  8. Disconnect the rear floor air outlet duct from the heater core outlet cover.
  9. 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.

  10. Remove the heater core outlet cover screws.
  11. Remove the heater core outlet cover.
    Fig 2: Removing Heater Core Outlet Cover
    G01482216Courtesy of GENERAL MOTORS CORP.
  12. Remove the heater core cover screws.
  13. Remove the heater core cover.
    Fig 3: Removing Heater Core Cover
    G01482217Courtesy 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 4: Removing Seals From Heater Core Cover
    G01482218Courtesy of GENERAL MOTORS CORP.
  16. Remove and discard the heater core outer seal (5) from the heater core.
    Fig 5: Removing Heater Core Outer Seal From Heater Core
    G01482219Courtesy 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 6: Removing Heater Core Pipe Retainer Clamp Screw
    G01482220Courtesy of GENERAL MOTORS CORP.
  20. Remove the heater core from the HVAC lower case.
  21. Remove the heater core pipe retainer clamp from the heater core pipes.
    Fig 7: Removing Heater Core From HVAC Lower Case
    G01482221Courtesy of GENERAL MOTORS CORP.
  22. Remove and discard the heater core lower seal (4) from the HVAC case.
    Fig 8: Removing Heater Core Lower Seal
    G01482222Courtesy of GENERAL MOTORS CORP.
  23. Remove and discard the heater core center seal (3) from the HVAC case.
    Fig 9: Removing Heater Core Center Seal
    G01482223Courtesy of GENERAL MOTORS CORP.
  24. Remove and discard the heater core upper seal (2) from the HVAC lower case.
    Fig 10: Removing Heater Core Upper Seal
    G01482224Courtesy of GENERAL MOTORS CORP.
  25. Remove and discard the heater core side seals (1) from the HVAC lower case.
    Fig 11: Removing Heater Core Side Seals
    G01482225Courtesy of GENERAL MOTORS CORP.
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