GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2001 🢒 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. Disconnect the heater hoses. Refer to the following procedures:
    4. •  Heater Inlet Hose Replacement
    •  Heater Outlet Hose Replacement
  4. Remove the accumulator. Refer to Air Conditioning Accumulator Replacement .
  5. Remove the instrument panel carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
  6. Remove the HVAC module drain hose.

    7. Object Number: 499156 Size: SH
  7. Disconnect the electrical harnesses and the ground connections as needed.

    8. Object Number: 363009 Size: SH
  8. Remove the HVAC module mounting nuts and the screws.
  9. Remove the HVAC module assembly from the vehicle.

Installation Procedure

    Object Number: 363009 Size: SH
  1. If replacing the HVAC module, transfer the components from the old HVAC module as necessary.
  2. Install the HVAC module assembly to the vehicle.

    3. 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.

  3. Install the HVAC module mounting nuts and the screws.

    4. Tighten

        • Tighten the mounting screws to 4 N·m (35 lb in).
        • Tighten the mounting nuts to 9 N·m (80 lb in).

    Object Number: 499156 Size: SH
  4. Connect the electrical harnesses and the ground connections.
  5. Install the HVAC module drain hose.
  6. Install the instrument panel carrier. Refer to Instrument Panel Carrier Replacement in Instrument Panel, Gages and Console.
  7. Install the accumulator. Refer to Air Conditioning Accumulator Replacement .
  8. Connect the heater hoses. Refer to the following procedures:
    9. •  Heater Inlet Hose Replacement
    •  Heater Outlet Hose Replacement
  9. Fill the cooling system. Refer to Cooling System Draining and Filling in Engine Cooling.