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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Heating, Ventilation, And Air Conditioning) >> Repair Instructions >> HVAC Module Assembly Replacement >> Removal Procedure

Removal Procedure

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  1. Drain the engine coolant. Refer to Draining and Filling Cooling System .
    2. Fig 1: Identifying Heater Hose To Heater Core Fittings
    GM362171Courtesy of GENERAL MOTORS CORP.
  2. Using the J 43181  disconnect the inlet heater hose from the heater core. See Special Tools .
    1. Install the J 43181  to the heater core pipe. See Special Tools .
    2. Close the tool around the heater core pipe.
    3. Firmly pull the tool into the quick connect end of the heater hose.
    4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the inlet hose from the heater core.
  3. Using the J 43181  disconnect the surge tank outlet hose from the heater core. See Special Tools .
    1. Install the J 43181  to the heater core pipe. See Special Tools .
    2. Close the tool around the heater core pipe.
    3. Firmly pull the tool into the quick connect end of the heater hose.
    4. Firmly grasp the heater hose. Pull the heater hose forward in order to disengage the surge tank outlet hose from the heater core.
  4. Remove the upper intake manifold sight shield. Refer to Upper Intake Manifold Sight Shield Replacement .
  5. Remove the battery. Refer to Battery Replacement .
  6. Remove the accumulator. Refer to Accumulator Replacement .
  7. Remove the instrument panel to the service position. Refer to Instrument Panel Service Positioning (With SLT) or Instrument Panel Service Positioning (Cadillac) .
  8. Remove the HVAC module drain hose.
  9. Disconnect the electrical harnesses and the ground connections from the HVAC module.
    10. Fig 2: Locating Rear Engine Cover
    GM1704876Courtesy of GENERAL MOTORS CORP.
  10. Locate the rear engine cover (1) on rear of intake manifold.
    11. Fig 3: View Of Engine Cover Access Location
    GM1704878Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Drill an 25.4 mm (1 in.) diameter hole in the rear engine cover (1) to access the HVAC module retaining nut located behind rear engine cover.
  11. Reposition the acoustic foam (if applicable) down from the access location (1).
    12. Fig 4: View Of HVAC Module, Nuts & Bolts
    GM1698730Courtesy of GENERAL MOTORS CORP.
  12. Remove the nuts (2) from the HVAC module (3).
  13. Remove the bolts (1) from the HVAC module (3).
  14. Remove the HVAC module (3).
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