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Installation Procedure

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  1. If a new HVAC module is being installed, add the specified amount of PAG oil to the evaporator core. Refer to Refrigerant System Capacities .
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  2. Install the HVAC module studs.

    Tighten:  Tighten the studs to 4 N.m (35 lb in).

    3. Fig 1: Identifying Air Inlet, Drain & Plumbing Seals in HVAC Module
    GM1229638Courtesy of GENERAL MOTORS CORP.
  3. Install new air inlet, drain and plumbing seals to the HVAC module.
    IMPORTANT: Ensure that the cut-outs on the dash-mat are properly aligned so that the drain and plumbing seals are seated directly against the cowl and the air inlet seal is seated directly against the dash-mat.
    The opening in the dash-mat for the HVAC module drain should be aligned so that the drain opening in the cowl is approximately centered in the dash-mat opening; allowing ample room for the module drain seal to fully seat against the cowl.
  4. Inspect the dash-mat for proper alignment to the cowl. Align if necessary.
    Fig 2: Identifying HVAC Module
    GM1247574Courtesy of GENERAL MOTORS CORP.
    NOTE: Do not force the HVAC module between upper I/P and lower I/P cross vehicle beams. Damage to the HVAC module can result.
    IMPORTANT: Spray a light coat of 3M™ P/N 08877 Silicone Lubricant Plus or equivalent onto the HVAC module heater cover to aid in the installation process.
  5. Install the HVAC module into the vehicle.
  6. Reposition the center console wire harness and the corresponding electrical connectors rearward of the lower tie bar.
  7. Install the recirculation housing to the HVAC module.
    8. Fig 3: Identifying Recirculation Housing Retaining Screws
    GM1247576Courtesy of GENERAL MOTORS CORP.
  8. Install the recirculation housing retaining screws.

    Tighten:  Tighten the screws to 1.6 N.m (14 lb in).

  9. Connect the HVAC module wiring harness to the recirculation housing.
    10. Fig 4: Identifying Actuator Electrical Connector
    GM1226128Courtesy of GENERAL MOTORS CORP.
  10. Connect the recirculation actuator electrical connector.
    11. Fig 5: Identifying Front LH Recirculation Housing Retaining Screw
    GM1247571Courtesy of GENERAL MOTORS CORP.
  11. Tighten the front LH recirculation housing retaining screw.

    Tighten:  Tighten the screw to 1.6 N.m (14 lb in).

    IMPORTANT: If necessary, gently rotate the HVAC module forward to engage the HVAC module studs through the corresponding holes on the cowl.
    12. Fig 6: Aligning Components To Corresponding Openings On The Cowl
    GM1229659Courtesy of GENERAL MOTORS CORP.
  12. Align the following components to the corresponding openings on the cowl:
    • The heater core block fitting
    • The evaporator block fitting
    • The HVAC module drain
    • The HVAC module studs
    13. Fig 7: HVAC Module, I/P Cross Vehicle Beam & Components
    GM1230181Courtesy of GENERAL MOTORS CORP.
  13. Install the bolts retaining the HVAC module to the upper I/P cross vehicle beam.

    Tighten:  Tighten the bolts to 5 N.m (44 lb in).

    IMPORTANT: To prevent possible water leaks or wind/road noise from entering the vehicle passenger compartment, do not reuse the old HVAC module retaining and sealing nuts.
  14. Install new HVAC module retaining and sealing nuts.

    Tighten:  Tighten the nuts to 10 N.m (89 lb in).

    15. Fig 8: Blower Motor & Retaining Screws At HVAC Module
    GM907907Courtesy of GENERAL MOTORS CORP.
  15. Install the blower motor to the HVAC module.
  16. Install the blower motor retaining screws.

    Tighten:  Tighten the screws to 1.6 N.m (14 lb in).

  17. Connect the blower motor electrical connector.
    18. Fig 9: Defroster Duct
    GM1229604Courtesy of GENERAL MOTORS CORP.
  18. Install the defroster duct to the HVAC module.
  19. Install the defroster duct retaining screws.

    Tighten:  Tighten the screws to 10 N.m (89 lb in).

  20. Install the right floor air outlet duct.
    21. Fig 10: Air Outlet Duct & Retaining Screws
    GM943568Courtesy of GENERAL MOTORS CORP.
  21. Install the floor air outlet duct retaining screws.

    Tighten:  Tighten the screws to 1.6 N.m (14 lb in).

  22. Install the lower outlet duct to the side window defogger.
  23. Connect the lower outlet duct on the side window defogger to the defroster duct.
  24. Remove the SIR bracket. Refer to Bracket Replacement - SIR in Instrument Panel, Gages, and Console.
    25. Fig 11: Identifying Defogger Lower Outlet Duct
    GM943428Courtesy of GENERAL MOTORS CORP.
  25. Connect the defogger lower outlet duct to the knee bolster bracket.
  26. Connect the defogger upper outlet duct to the defogger lower outlet duct.
    27. Fig 12: Defogger Outlet Ducts & Retainers
    GM943438Courtesy of GENERAL MOTORS CORP.
  27. Install the retainers to the defogger upper outlet duct.
  28. Install the left rear floor air outlet duct.
    29. Fig 13: Floor Air Outlet Duct & Retaining Screws
    GM943584Courtesy of GENERAL MOTORS CORP.
  29. Install the floor air outlet duct retaining screws.

    Tighten:  Tighten the screws to 1.6 N.m (14 lb in).

  30. Connect the window defogger lower outlet duct to the defroster duct.
    31. Fig 14: Identifying Lower Defogger Outlet Duct & Retainer
    GM943424Courtesy of GENERAL MOTORS CORP.
  31. Install the defogger lower outlet duct retainer.
  32. Install the screw that secures the HUD to the steering column bracket.

    Tighten:  Tighten the screw to 3 N.m (27 lb in).

  33. Install the HUD retaining nuts.

    Tighten:  Tighten the nuts to 5 N.m (44 lb in).

    34. Fig 15: View Of HUD
    GM1224615Courtesy of GENERAL MOTORS CORP.
  34. Connect the HUD electrical connector.
  35. Connect the defogger upper outlet duct.
    36. Fig 16: Defogger Duct & Components
    GM943433Courtesy of GENERAL MOTORS CORP.
  36. Install the retainers to the upper defogger duct.
  37. Install the I/P assembly. Refer to Instrument Panel (I/P) Assembly Replacement in Instrument Panel, Gages, and Console.
    Fig 17: Identifying Evaporator Drain Tube At HVAC Module
    GM945438Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Ensure that the evaporator drain tube is fully seated to the HVAC module.
  38. Install the evaporator drain tube (1) to the HVAC module.
  39. Install the heater pipe assembly. Refer to Heater Pipes Replacement .
  40. Fill the cooling system. Refer to Draining and Filling Cooling System (Static Fill) or Draining and Filling Cooling System (GE 47716) in Engine Cooling.
  41. Evacuate and recharge the A/C system. Refer to Refrigerant Recovery and Recharging .
  42. Leak test the fittings of the component using J 39400-A  . See Special Tools .
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