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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1098 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> HVAC Module Assembly Replacement >> Installation Procedure

Installation Procedure

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
    Fig 1: View Of Thick Foam Packing On Heater Core Pipes
    GM819805Courtesy of GENERAL MOTORS CORP.
  1. Install the thick foam packing (1) on the heater core pipes.
  2. Install the thin foam packing (2) on the heater core pipes.
    3. Fig 2: View Of Thick Foam Packing On A/C Lines
    GM819804Courtesy of GENERAL MOTORS CORP.
  3. Install the thick foam packing (1) on the A/C lines.
  4. Install the thin foam packing (2) on the A/C lines.
  5. Install the HVAC module into the vehicle.
    6. NOTE: Refer to Fastener Notice .
  6. Install the upper left HVAC module mounting nut (1).

    Tighten:  Tighten the nut to 9 N.m (80 lb in).

    7. Fig 3: Locating Lower Left HVAC Module Mounting Nut
    GM756232Courtesy of GENERAL MOTORS CORP.
  7. Install the lower left HVAC module mounting nut (1).

    Tighten:  Tighten the nut to 9 N.m (80 lb in).

  8. Connect the rear heater ducts to the HVAC module.
  9. Connect the drain tube to the bottom of the HVAC module.
    10. Fig 4: View Of Rubber Adhesive Patch & Drain Tube
    GM756222Courtesy of GENERAL MOTORS CORP.
  10. Connect the drain tube (2) to the floor.
  11. Connect the HVAC electrical connector.
  12. Install the air inlet assembly.
    13. Fig 5: Condenser Tube To Liquid Line
    GM817518Courtesy of GENERAL MOTORS CORP.
  13. Lubricate the O-rings of the A/C line with refrigerant oil before connecting the A/C lines. Refer to O-Ring Replacement .
    14. Fig 6: Identifying Air Conditioning Suction Hose & Retainer
    GM817539Courtesy of GENERAL MOTORS CORP.
  14. Install the A/C line and A/C line quick connect line clamp (1) to the evaporator.
    15. Fig 7: Engaging Clamp
    GM817519Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Press the A/C line quick connect line clamp together until you hear it engage.
  15. Engage the clamp.
    16. Fig 8: Identifying A/C Fitting Retainer
    GM817540Courtesy of GENERAL MOTORS CORP.
  16. Install the A/C line and A/C line quick connect line clamp (1) to the evaporator.
    17. Fig 9: Engaging Clamp
    GM817519Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Press the A/C line quick connect line clamp together until you hear it engage.
  17. Engage the clamp.
    18. Fig 10: Identifying Inlet Heater Hose
    GM760782Courtesy of GENERAL MOTORS CORP.
  18. Connect the heater inlet hose (1) using J 38185  .
    19. Fig 11: Identifying Heater Outlet Hose
    GM760784Courtesy of GENERAL MOTORS CORP.
  19. Connect the heater outlet hose (1) using J 38185  .
  20. Install the IP carrier. Refer to Instrument Panel Carrier Replacement .
  21. Install the battery. Refer to Battery Replacement (Side Post) .
  22. Fill the coolant. Refer to Cooling System Draining and Filling (GE 47716) or Cooling System Draining and Filling (Static Fill) .
  23. Evacuate and recharge the AC system. Refer to Refrigerant Recovery and Recharging .
  24. Leak test the fittings of the component using J 39400-A  . See Special Tools .
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