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Removal Procedure

WARNING: This page is about a different car, the 2003 Chevrolet Monte Carlo and 2003 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.
  1. Remove the fuel injector sight shield, if equipped with 3.8L. Refer to Fuel Injector Sight Shield Replacement in Engine Mechanical-3.8L.
  2. Drain the coolant. Refer to Draining and Filling Cooling System in Engine Cooling.
    3. Fig 1: View Of Heater Inlet Hose At Heater Core
    GM415886Courtesy of GENERAL MOTORS CORP.
  3. Use J 38185  in order to position aside the heater hose inlet and outlet clamp at the heater core.
  4. Disconnect the inlet and outlet heater hose from the heater core.
  5. Remove the vacuum tank. Refer to Vacuum Tank Replacement in HVAC System - Manual.
  6. Remove the floor carpet. Refer to Carpet Replacement - Front in Interior Trim.
  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.
    10. Fig 2: View Of Heater Core Outlet Cover
    GM508311Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Position the heater outlet cover downward and rearward in order to disconnect the cover from the rear area floor duct assembly.
  10. Remove the heater outlet cover screws.
  11. Remove the heater outlet cover.
    12. Fig 3: Heater Core Cover
    GM295349Courtesy of GENERAL MOTORS CORP.
  12. Remove the heater core cover screws.
  13. Remove the heater core cover.
    14. Fig 4: Heater Core Cover Seals & Caulk
    GM143978Courtesy 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 outlet cover.
    16. Fig 5: Heater Core Outer Seal
    GM296242Courtesy of GENERAL MOTORS CORP.
  16. Remove and discard the outer seal (5) from the heater core.
    17. Fig 6: Heater Core Pipe Retainer Clamp & Screw
    GM295351Courtesy of GENERAL MOTORS CORP.
  17. Remove the heater core pipe retainer clamp screw (2) from the heater core retainer clamp.
  18. Remove the heater core retaining clamp screw (1) from the heater core.
  19. Remove the retaining clamp from the heater core.
    20. Fig 7: Lower HVAC Module Case & Heater Core
    GM295353Courtesy 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.
    22. Fig 8: Locating Lower Seal For HVAC Case
    GM143987Courtesy of GENERAL MOTORS CORP.
  22. Remove and discard the heater core lower seal (4) from the HVAC case.
    23. Fig 9: Locating Center Seal For HVAC Case
    GM143992Courtesy of GENERAL MOTORS CORP.
  23. Remove and discard the heater core center seal (3) from the HVAC case.
    24. Fig 10: Locating Upper Seal For HVAC Case
    GM143985Courtesy of GENERAL MOTORS CORP.
  24. Remove and discard the heater core upper seal (2) from the HVAC lower case.
    25. Fig 11: Locating Side Seals For HVAC Case
    GM143990Courtesy of GENERAL MOTORS CORP.
  25. Remove and discard the heater core side seals (1) from the HVAC lower case.
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