Question about 1999 Chevrolet Silverado 1500

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Heater vents seem to be blocked inside the casing

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

    heater vents seem to be blocked inside the casing - 320715d.jpg

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

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

    eb0726a.jpg

    Fig. Blend door actuator and related components

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

    b6aeb2b.jpg

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

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. Line up the A/C valve lever with the blend door actuator cam
  2. 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).
  3. Connect the electrical connection at the blend door actuator (10).

    0996b43f8020540d.jpg

    Fig. Blend door actuator and related components

  4. Install the floor air outlet duct extension (1) to the floor air duct (2).


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Posted on Oct 14, 2010

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