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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 167 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> HVAC Module Assembly Replacement >> Removal Procedure

Removal Procedure

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Recover the refrigerant. Refer to Refrigerant Recovery and Recharging .
  2. Drain the coolant. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (GE 47716) .
  3. Disconnect the heater inlet hose from the heater core. Refer to Heater Inlet Hose Replacement (LY7)  or Heater Inlet Hose Replacement (LH2) .
  4. Disconnect the heater outlet hose from the heater core. Refer to Heater Outlet Hose Replacement (LY7)  or Heater Outlet Hose Replacement (LH2) .
  5. At the evaporator core, disconnect and remove the A/C quick connect fittings from the suction hose and the liquid line. Refer to Air Conditioning Line/Tube Connector Removal/Replacement .
  6. Separate the suction hose and liquid line from the evaporator core.
  7. Remove and discard the O-rings.
    8. Fig 1: View Of Rubber Adhesive Patch & Drain Tube
    GM756222Courtesy of GENERAL MOTORS CORP.
  8. Remove the instrument panel (I/P) carrier. Refer to Instrument Panel Carrier Replacement .
  9. Remove the air inlet assembly.
  10. Disconnect the HVAC module electrical connector.
  11. Disconnect the HVAC module drain tube (2) from the floor.
    12. Fig 2: Locating Lower Left HVAC Module Mounting Nut
    GM756232Courtesy of GENERAL MOTORS CORP.
  12. Remove the lower left HVAC module mounting nut (1).
    13. Fig 3: Locating Upper Left HVAC Module Mounting Nut
    GM756237Courtesy of GENERAL MOTORS CORP.
  13. Remove the upper left HVAC module mounting nut (1).
  14. Remove the HVAC module from the vehicle.
    15. Fig 4: Removing Foam From A/C Line
    GM817511Courtesy of GENERAL MOTORS CORP.
  15. Remove the foam from the A/C lines.
  16. Remove the foam from around the heater pipes.
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