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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 >> Installation Procedure

Installation Procedure

    Fig 1: HVAC Module
    GM810832Courtesy of GENERAL MOTORS CORP.
  1. If replacing the HVAC module, transfer the components from the old HVAC module as necessary.
  2. Install the HVAC module assembly (2) to the vehicle (1).
    3. NOTE: Refer to Fastener Notice .
  3. Install the nuts (4) to the HVAC module assembly (2).

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

  4. Install the bolts (4) to the HVAC module assembly (2).

    Tighten:  Tighten the bolts to 4 N.m (35 lb in).

  5. Connect the electrical harnesses and the ground connections.
  6. Install the HVAC module drain hose.
  7. Install the instrument panel carrier. Refer to Instrument Panel Carrier Replacement .
  8. Install the accumulator. Refer to Accumulator Replacement .
    9. Fig 2: Identifying Heater Hose To Heater Core Fittings
    GM362171Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Firmly push the quick connect onto the heater core pipe until you hear an audible click.
  9. Install the surge tank outlet hose to the heater core.
  10. Pull the surge tank outlet hose to ensure the connection.
  11. Install the inlet heater hose to the heater core.
    IMPORTANT: Firmly push the quick connect onto the heater core pipe until you hear an audible click.
  12. Pull the inlet heater hose to ensure the connection.
  13. Fill the engine coolant. Refer to Cooling System Draining and Filling (Static Fill) or Cooling System Draining and Filling (Vac-N-Fill) .
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