Avalanche, Sierra, Silverado, C&K Series, 1999-2005

Removal & Installation

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  1. Remove the floor air outlet duct extension (1) from the floor duct (2).

    Click image to see an enlarged view

    Fig. Remove the floor air outlet duct extension (1) from the floor duct (2)

  2.  
  3. Disconnect the electrical connection at the blend door actuator (10).

    Click image to see an enlarged view

    Fig. Blend door actuator and related components

  4.  
  5. Remove the blend door actuator mounting screws from the HVAC module.
  6.  
  7. Remove the blend door actuator as an assembly with the actuator cam.

    Click image to see an enlarged view

    Fig. Remove the blend door actuator mounting screws from the HVAC module

  8.  

To install:

  1. Install the blend door actuator as an assembly with the actuator cam.
    1. Line up the heater/defroster valve lever with the blend door actuator cam slot.
    2.  
    3. Line up the A/C valve lever with the blend door actuator cam
    4.  

  2.  
  3. Install the blend door actuator mounting screw to the HVAC module.
    1. Tighten the blend door actuator mounting screw to 14 inch lbs. (1.6 Nm).
    2.  

  4.  
  5. Connect the electrical connection at the blend door actuator (10).

    Click image to see an enlarged view

    Fig. Blend door actuator and related components

  6.  
  7. Install the floor air outlet duct extension (1) to the floor air duct (2).
  8.  

  1. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  2.  
  3. Remove the screws.
  4.  
  5. Remove the adjuster links from the control lever.
  6.  
  7. Remove the mode actuator.
  8.  
  9. Adjust the mode actuator by completing the following steps:
    1. Connect the electrical connector to the actuator.
    2.  
    3. Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
    4.  
    5. Turn the ignition switch to the OFF position.
    6.  
    7. Remove the actuator from the electrical connection.

      Click image to see an enlarged view

      Fig. Blend door actuator-C/K Series

    8.  

  10.  

To install:

  1. Install the mode actuator.
  2.  
  3. Install the screws.
  4.  
  5. Install the adjuster links to the control lever.
  6.  
  7. Connect the electrical connector.
  8.  
  9. Test the circuit operation
  10.  

  1. Disconnect the negative battery cable.
  2.  
  3. Disconnect the electrical connector to the mode actuator that is located on the left side of the air distribution case.
  4.  
  5. Remove the screws.
  6.  
  7. Remove the adjuster links from the control lever.
  8.  
  9. Remove the mode actuator.
  10.  
  11. Adjust the mode actuator by completing the following steps:

    Connect the electrical connector to the actuator.
     
    Turn the ignition switch to the RUN position. Allow the self-positioning of the actuator.
     
    Turn the ignition switch to the OFF position.
     
    Remove the actuator from the electrical connection.

    Click image to see an enlarged view

    Fig. Location of actuator

     

  12.  

To install:

  1. Install the mode actuator.
  2.  
  3. Install the screws.
  4.  
  5. Install the adjuster links to the control lever.
  6.  
  7. Connect the electrical connector.
  8.  
  9. Connect the negative battery cable.
  10.  
  11. Test the circuit operation
  12.  

 
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