GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2002 🢒 Impala 🢒 HVAC 🢒 Heating, Ventilation and Air Conditioning 🢒 Mode Door Replacement

Removal Procedure

    Caution: Refer to Battery Disconnect Caution in the Preface section.

  1. Disconnect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  2. Remove the IP lower trim panel. Refer to Instrument Panel Lower Trim Panel Replacement in Instrument Panel, Gages, and Console.
  3. Remove the steering column. Refer to Steering Column Replacement in Steering Wheel and Column.
  4. Disconnect the left side fuse block from the cross vehicle beam.

    5. Object Number: 812951 Size: SH
  5. Remove the retaining screw (1) from the panel air duct.
  6. Remove the bolts from the panel air duct.
  7. Remove the panel air duct from the cross vehicle beam.

    8. Object Number: 507699 Size: SH
  8. Remove the retaining bolts from the right air duct.
  9. Remove the right air duct from the cross vehicle beam.
  10. Remove the passenger knee bolster bracket. Refer to Passenger Knee Bolster Bracket Replacement in Instrument Panel, Gages, and Console.
  11. Position the body control module away from the cross vehicle beam.
  12. Remove the brake pedal. Refer to Brake Pedal Replacement in Hydraulic Brakes.
  13. Remove the three brake pedal brace bolts from the cross vehicle beam.
  14. Disconnect any ground wires, as necessary.
  15. Release the wiring harness retaining clips from the cross vehicle beam and position the wiring harness aside.

    16. Object Number: 558111 Size: SH
  16. Remove the bolts from the HVAC module center support.
  17. Remove the bracket from the HVAC module center support.
  18. Reposition the vacuum harness.

    19. Object Number: 558113 Size: SH
  19. Remove the bracket bolts from the HVAC module upper support.

    20. Object Number: 812572 Size: SH
  20. Remove the bolts from the right and left side of the cross vehicle beam.

    21. Object Number: 558194 Size: SH
  21. Remove the cross vehicle beam.

    22. Object Number: 295281 Size: SH
  22. Disconnect the vacuum lines from the mode actuator.
  23. Lift the lock tab up (1) to remove the actuator.
  24. Remove the mode actuator off the slides of the HVAC module assembly.
  25. Disconnect the actuator pushrod from the mode door lever and remove the actuator.

    26. Object Number: 607130 Size: SH
  26. Remove the retaining screws (1) to the air distribution case cover.
  27. Remove the air distribution case cover (2).
  28. Remove and discard the air distribution case seal.

    29. Object Number: 607136 Size: SH
  29. Remove the mode door (2).

Installation Procedure

    Object Number: 607136 Size: SH

    Important: Align the mode door assist spring to the HVAC module assembly case.

  1. Install the mode door (2).
  2. Install a new air distribution case seal.

    3. Object Number: 607130 Size: SH
  3. Install the air distribution case cover (2).

    4. 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.

  4. Install the retaining screws (1) to the air distributor cover.

    5. Tighten
    Tighten the screws to 1.5 N·m (13 lb in).


    Object Number: 295292 Size: SH
  5. Connect the mode actuator pushrod to the mode door lever.
  6. Position the mode actuator on to the mounting slides of the HVAC module assembly.
  7. Ensure that the lock tab locks the defroster actuator in place.
  8. Connect the vacuum lines to the mode actuator.

    9. Object Number: 558194 Size: SH
  9. Install the cross vehicle beam to the vehicle.

    10. Object Number: 812572 Size: SH
  10. Install the bolts to the right and left side of the cross vehicle beam.
  11. Tighten the bolts to the right and left side of the cross vehicle beam in sequence.

    12. Tighten
    Tighten the bolts to 25 N·m (18 lb ft).


    Object Number: 558113 Size: SH
  12. Install the bracket bolts to the HVAC module upper support.

    13. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  13. Install the passenger knee bolster bracket. Refer to Passenger Knee Bolster Bracket Replacement .

    14. Object Number: 558111 Size: SH
  14. Install the bracket to the HVAC module center support.
  15. Reposition the vacuum harness to the original position.
  16. Install the bracket bolts to the HVAC module center support.
  17. Tighten the bracket bolts in sequence as shown.

    18. Tighten
    Tighten the bolts 10 N·m (89 lb in).

  18. Reposition the IP wiring harness on to the cross vehicle beam and secure the retaining clips.
  19. Connect all disconnected ground wires.
  20. Install the brake pedal. Refer to Brake Pedal Replacement in Hydraulic Brakes.
  21. Install the three brake pedal brace bolts

    22. Tighten
    Tighten the bolts to 50 N·m (37 lb ft).

  22. Reposition the body control module in place.
  23. Install the left side fuse block to the cross vehicle beam.

    24. Object Number: 507699 Size: SH
  24. Install the right air duct to the cross vehicle beam.
  25. Install the right air duct bolts.

    26. Tighten
    Tighten the bolts to 10 N·m (89 lb in).


    Object Number: 812951 Size: SH
  26. Install the panel air duct to the cross vehicle veam.
  27. Install the panel air duct screw (1).

    28. Tighten
    Tighten the bolts to 1.8 N·m (16 lb in).

  28. Install the panel air duct bolts.

    29. Tighten
    Tighten the bolts to 10 N·m (89 lb in).

  29. Install the steering column. Refer to Steering Column Replacement in Steering Wheel and Column.
  30. Install the IP lower trim panel. Refer to Instrument Panel Lower Trim Panel Replacement in Instrument Panel, Gages, and Console.
  31. Connect the battery negative cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.