Silverado 2008

Defroster Door

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Removal & Installation



  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE
    When performing service on or near the SRS components, or SRS wiring the SRS must be disabled. Failure to observe the correct procedure could cause deployment of the SRS components. Serious injury can occur.

  2.  
  3. Position the steering wheel so the front wheels are in the straight ahead position.
  4.  
  5. Be sure the ignition switch is in the OFF position.
  6.  
  7. Disconnect the negative battery cable.
    NOTE
    The SDM may have more than one fused power input. To ensure that there is no unwanted SRS deployment, personal injury, or unnecessary SRS system repairs, remove all fuses supplying power to the SDM. With all SDM fuses removed and the ignition switch in the ON position, the AIR BAG warning indicator will illuminate. This is normal and does not indicate a SRS system malfunction.

  8.  
  9. Locate and remove the fuses supplying power to the SDM.
  10.  
  11. Wait one minute before working on the vehicle.
  12.  
  13. Drain the cooling system. Properly dispose of used coolant.
  14.  
  15. Disconnect and plug the heater hoses at the HVAC unit.
  16.  
  17. Remove the upper intake manifold sight shield, if equipped.

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    Fig. Upper intake manifold sight shield-4.8L, 5.3L & 6.0L engines



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    Fig. Battery location and related components

  18.  
  19. Remove the battery.
  20.  
  21. Properly discharge the air conditioning system. Remove the accumulator.

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    Fig. Accumulator and related components

  22.  
  23. Lock the steering column using tool J42640 through the access hole in the lower column trim cover.

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    Fig. Steering column lock tool J42640



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    Fig. Steering shaft coupling nut location

  24.  
  25. Remove the steering shaft coupling nut and bolt at the steering column.
  26.  
  27. Remove the front seats.

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    Fig. Front seats and related components



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    Fig. Front console and related components-except SLT



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    Fig. Front console and related components-SLT

  28.  
  29. Remove the center seat or front console.
  30.  
  31. Remove the outer trim cover replacement panels.

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    Fig. Outer trim cover and related components



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    Fig. Windshield pillar garnish molding and related components

  32.  
  33. Remove the windshield pillar garnish moldings.
  34.  
  35. Remove the instrument panel upper trim panel with the defroster nozzle grille. Tape the light sensor to the instrument upper panel, so you do not misplace it.

    Click image to see an enlarged view

    Fig. Upper trim panel and related components-without SLT



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    Fig. Upper trim panel and related components-with SLT

  36.  
  37. Remove the left and right body hinge trim panels.

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    Fig. Body hinge trim panel and related components-with SLT



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    Fig. Instrument panel center support and related components-with SLT

  38.  
  39. Remove the instrument panel center support bracket.
    NOTE
    Note the location and routing of the wiring harness prior to removal, to ensure proper assembly.

  40.  
  41. On the right side, disconnect the electrical connections to the instrument panel electrical center. Disconnect the electrical connector for the SRS module. Disconnect the antenna lead. Release the wire looms securing the harnesses to the instrument panel.
  42.  
  43. On the left side, disconnect the electrical connections to the instrument panel electrical center. Disconnect the ground wires from the upper left cowl panel. Remove the body wiring harness junction block, from its bracket. Release the wire looms securing the harnesses to the instrument panel.
  44.  
  45. Remove the four bolts securing the instrument panel upper trim panel to the cowl.

    Click image to see an enlarged view

    Fig. Upper trim panel to cowl retaining bolt locations



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    Fig. Instrument panel to cowl retaining bolt locations

  46.  
  47. Remove the two bolts securing the instrument carrier support to the cowl.
    NOTE
    These bolts are located down inside the instrument panel and can be seen thru the windshield.

  48.  
  49. Remove the four bolts releasing the instrument panel assembly from the vehicle.

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    Fig. Instrument panel side retaining bolt locations



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    Fig. Instrument panel in service position

  50.  
  51. With the aid of an assistant pull the assembly rearward, in the vehicle until the locator pin on each side clears the opening.
  52.  
  53. Remove the assembly from the vehicle, or position the assembly in the service position.
  54.  
  55. Remove the nuts from the HVAC module assembly. Remove the bolts from the HVAC module assembly.
  56.  
  57. Carefully remove the HVAC module from the vehicle.

    Click image to see an enlarged view

    Fig. HVAC module and related components-view one



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    Fig. HVAC module and related components-view two

  58.  
  59. If equipped, remove the heat stakes.
  60.  
  61. Remove the HVAC module assembly screws. Separate the case halves.
  62.  
  63. Remove the mode actuator screws. Remover the mode actuator.
  64.  
  65. Remove the mode actuator cam assembly.
  66.  
  67. Remove the defroster door.
  68.  

To install:


NOTE
Be sure to use new fasteners, as required.


NOTE
For every heat stake removed, be sure that you install a new screw.

  1. Installation is the reverse order of the removal procedure.
  2.  
  3. Tighten the steering shaft coupling nut to 37 ft. lbs. (50 Nm).
  4.  
  5. Enable the SRS system. Be sure the ignition switch is in the OFF position. Install the fuses. Connect the negative battery cable. Turn the ignition switch to the ON position. If the system is operating properly the AIR BAG indicator will flash.
  6.  
  7. Correct problems as required.
  8.  

 
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