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Home >> Chevrolet >> 2006 >> Silverado 1500 HD, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1100 (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 CTS. 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. Remove the battery. Refer to Battery Replacement (Side Post) .
  3. Drain the coolant. Refer to Cooling System Draining and Filling (GE 47716) or Cooling System Draining and Filling (Static Fill) .
    4. Fig 1: Identifying Inlet Heater Hose
    GM760782Courtesy of GENERAL MOTORS CORP.
  4. Using the J 38185  disconnect the heater inlet hose (1).
    5. Fig 2: Identifying Heater Outlet Hose
    GM760784Courtesy of GENERAL MOTORS CORP.
  5. Using the J 38185  disconnect the heater outlet hose (1).
  6. Disconnect both A/C lines at the cowl.
    7. IMPORTANT: The body of the tool should be parallel to the A/C line.
    Fig 3: Removing Condenser Tube Quick Connect Fitting
    GM817526Courtesy of GENERAL MOTORS CORP.
  7. Using the J 45689  (1) insert the probe end into the two small openings of the plastic quick joint. See Special Tools .
  8. Remove both quick joint clamps.
  9. Disconnect both A/C lines.
    10. Fig 4: View Of Rubber Adhesive Patch & Drain Tube
    GM756222Courtesy of GENERAL MOTORS CORP.
  10. Remove the IP Carrier. Refer to Instrument Panel Carrier Replacement .
  11. Remove the air inlet assembly.
  12. Disconnect the HVAC module electrical connector.
  13. Disconnect the HVAC module drain tube (2) from the floor.
    14. Fig 5: Releasing Left Rear Duct
    GM756217Courtesy of GENERAL MOTORS CORP.
  14. Press the tab and release the left rear duct from the HVAC module.
    15. Fig 6: View Of Module Duct
    GM756233Courtesy of GENERAL MOTORS CORP.
  15. Disconnect the left rear heater duct from the HVAC module.
    16. Fig 7: Releasing Right Rear Duct
    GM756215Courtesy of GENERAL MOTORS CORP.
  16. Press the tab and release the right rear duct from the HVAC module.
    17. Fig 8: View Of Air Outlet Duct - RH
    GM756234Courtesy of GENERAL MOTORS CORP.
  17. Disconnect the right rear heater ducts from the HVAC module.
    18. Fig 9: Locating Lower Left HVAC Module Mounting Nut
    GM756232Courtesy of GENERAL MOTORS CORP.
  18. Remove the lower left HVAC module mounting nut (1).
    19. Fig 10: Locating Upper Left HVAC Module Mounting Nut
    GM756237Courtesy of GENERAL MOTORS CORP.
  19. Remove the upper left HVAC module mounting nut (1).
  20. Remove the HVAC module from the vehicle.
    21. Fig 11: Removing/Installing Foam At A/C Line
    GM817511Courtesy of GENERAL MOTORS CORP.
  21. Remove the foam from the A/C lines.
  22. Remove the foam from around the heater pipes.
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