GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2004 🢒 GMC C Sierra - 2WD 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Heater/Vent Module Replacement

Removal Procedure
  1. Drain the engine coolant. Refer to Cooling System Draining and Filling in Engine Cooling.
  2. If equipped remove the auxiliary battery. Refer to Auxiliary Battery Replacement in Engine Electrical.
  3. Reposition the inlet heater hose clamp from the heater core.
  4. Remove the inlet heater hose from the heater core.
  5. Reposition the outlet heater hose clamp from the heater core.
  6. Remove the outlet heater hose from the heater core.
  7. Remove the I/P carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
  8. Remove the heater/vent module drain hose.

    9. Object Number: 499156 Size: SH
  9. Disconnect the electrical harnesses and the ground connections.

    10. Object Number: 363009 Size: SH
  10. Remove the heater/vent module mounting nuts and the screws.
  11. Remove the heater/vent module assembly from the vehicle.

Installation Procedure

    Object Number: 363009 Size: SH
  1. Install the heater/vent module assembly to the vehicle.

    2. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  2. Install the heater/vent module mounting nuts.

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

  3. Install the heater/vent module mounting screws.

    4. Tighten
    Tighten the screws to 4 N·m (35 lb in).


    Object Number: 499156 Size: SH
  4. Connect the electrical harnesses and the ground connections.
  5. Install the heater/vent module drain hose.
  6. Install the I/P carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
  7. Install the outlet heater hose to the heater core.
  8. Reposition the outlet heater hose clamp to the heater core.
  9. Install the inlet heater hose to the heater core.
  10. Reposition the inlet heater hose clamp to the heater core.
  11. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.