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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating, Ventilation, And Air Conditioning >> Repair Instructions >> HVAC Module Assembly Replacement >> Removal Procedure

Removal Procedure

  1. Drain the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac-N-Fill) .
    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.
    1. Install the J 43181  to the heater core pipe.
    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.
    1. Install the J 43181  to the heater core pipe.
    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 accumulator. Refer to Accumulator Replacement .
  5. Remove the instrument panel carrier. Refer to Instrument Panel Carrier Replacement .
  6. Remove the HVAC module drain hose.
  7. Disconnect the electrical harnesses and the ground connections from the HVAC module assembly.
    8. Fig 2: HVAC Module
    GM810832Courtesy of GENERAL MOTORS CORP.
  8. Remove the nuts (4) from the HVAC module assembly (2).
  9. Remove the bolts (3) from the HVAC module assembly (2).
  10. Remove the HVAC module assembly (2) from the vehicle (1).
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