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Home >> Chevrolet >> 2002 >> Impala LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 586 (HVAC Systems - Automatic) >> Repair Instructions >> HVAC Module Assembly Replacement >> Removal Procedure

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.
    CAUTION: Refer to Battery Disconnect Caution in Cautions and Notices.
  1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  2. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  3. Drain the cooling system. Refer to Draining and Filling Cooling System in Engine Cooling.
  4. Remove the cross vehicle brace. Refer to Brace Replacement - Cross Vehicle in Body Front end.
    5. Fig 1: A/C Line Block Fitting Bolt At Evaporator
    GM532742Courtesy of GENERAL MOTORS CORP.
  5. Remove the accumulator tube to evaporator core block fitting bolt.
  6. Disconnect the accumulator tube from the evaporator.
  7. Disconnect the evaporator tube from the evaporator.
  8. Remove the O-rings seals and discard.
    9. Fig 2: View Of Heater Inlet Hose At Heater Core
    GM415886Courtesy of GENERAL MOTORS CORP.
  9. UseJ 38185  in order to position aside the heater hose inlet and outlet clamp at the heater core.
  10. Disconnect the inlet and outlet heater hose from the heater core.
  11. Remove the IP lower trim panel. Refer to Instrument Panel (I/P) Trim Panel Replacement - Lower (Impala) or Instrument Panel (I/P) Trim Panel Replacement - Lower (Monte Carlo) in Instrument Panel, Gages, and Console.
    12. Fig 3: Panel Air Duct, Retaining Screw & Retaining Bolts
    GM812951Courtesy of GENERAL MOTORS CORP.
  12. Remove the retaining screw (1) from the panel air duct.
  13. Remove the retaining bolts from the panel air duct.
  14. Remove the panel air duct from the cross vehicle beam.
    15. Fig 4: Right Air Distribution Duct & Retaining Bolts
    GM507699Courtesy of GENERAL MOTORS CORP.
  15. Remove the retaining bolts from the right air duct.
  16. Remove the right air duct from the cross vehicle beam.
  17. Remove the steering column. Refer to Steering Column Replacement in Steering Wheel and Column.
  18. Disconnect the left side fuse block from the cross vehicle beam.
  19. Remove the passenger knee bolster bracket. Refer to Knee Bolster Bracket Replacement - Right in Instrument Panel, Gages, and Console.
  20. Position the body control module away from the cross vehicle beam.
  21. Disconnect any ground wires, as necessary.
  22. Remove the brake pedal. Refer to Brake Pedal Assembly Replacement in Hydraulic Brakes.
  23. Remove the 3 bolts from the brake pedal bracket to cross vehicle beam.
  24. Release the wiring harness retaining clips from the cross vehicle beam and position the wiring harness aside.
    25. Fig 5: HVAC Module Center Support & Bolts
    GM558111Courtesy of GENERAL MOTORS CORP.
  25. Remove the bolts from the HVAC module center support.
  26. Remove the bracket from the HVAC module center support.
  27. Reposition the vacuum harness.
    28. Fig 6: HVAC Module Upper Support
    GM558113Courtesy of GENERAL MOTORS CORP.
  28. Remove the bracket bolts from the HVAC module upper support.
    29. Fig 7: Cross Vehicle Beam & Bolts
    GM812572Courtesy of GENERAL MOTORS CORP.
  29. Remove the bolts from the right and left side of the cross vehicle beam.
    30. Fig 8: Cross Vehicle Beam
    GM558194Courtesy of GENERAL MOTORS CORP.
  30. Remove the cross vehicle beam.
  31. Disconnect the vacuum hoses from the HVAC control module.
  32. Disconnect the electrical connectors from the HVAC control module.
    33. Fig 9: View Of Evaporator Drain Elbow
    GM282300Courtesy of GENERAL MOTORS CORP.
  33. Remove the evaporator drain elbow.
    34. Fig 10: HVAC Module Assembly To Dash Nuts
    GM507700Courtesy of GENERAL MOTORS CORP.
  34. Remove the nuts which secure the HVAC control module to the dash.
  35. Remove the HVAC control module:
    1. Pull the HVAC control module rearward to disengage the mounting studs from the dash panel.
    2. Position aside the dash insulator pad from the recirculation opening of the HVAC control module .
    3. Roll the HVAC control module downward and rearward to disconnect the heater core outlet cover from the rear floor air outlet duct.
    4. Remove the HVAC control module.
    36. Fig 11: Locating HVAC Module Assembly Seals
    GM283719Courtesy of GENERAL MOTORS CORP.
  36. Remove and discard all of the seals (1,2,3) from the outer HVAC control module.
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