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  1. #1
    Jr. Mechanic
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    Florida Gulf Coast
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    Default '90 Suburban a/c air vents & switch question..?

    I just got the a/c on our '90 Sub repaired (compressor and all) and I noticed that when the a/c switch is in the "Normal" position, that the air flow still comes out as if the switch were on "Bi-level"....about 50/50.

    Where do I need to start, or what do I need to do to get all/most of the air to come out of the dash vents when the switch is on "normal" ?

    Thanks

    BTW - Defrost works fine as does the "max"...
    Semper Fi :fighting0037:

    1990 1500 Suburban 6.2L Diesel 4x4


  2. #2
    Legend

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    Feb 2008
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    Red Wing, Minnesota, United States
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    Default

    If I could see i pic of the vent controller it would help, just cant picture its setup, I know its the two sliding levers though
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  3. #3
    Jr. Mechanic
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    Mar 2009
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    Florida Gulf Coast
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    Default

    Quote Originally Posted by vncj96 View Post
    If I could see i pic of the vent controller it would help, just cant picture its setup, I know its the two sliding levers though
    Yes, its the slide levers with the pattern:

    max - normal - bi level - vent - heat - defrost ...in that order, and the "normal" position is acting like the "bi level".
    Semper Fi :fighting0037:

    1990 1500 Suburban 6.2L Diesel 4x4


  4. #4
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    Default

    Your bi-level setting I am guessing isnt for the air, just cool or heat and your normal and max setting is specifically for ac, so this is by design, max is full ac.
    Last edited by vncj96; 05-17-2009 at 04:25 PM.
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

  5. #5
    Jr. Mechanic
    Join Date
    Mar 2009
    Location
    Florida Gulf Coast
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    120

    Default

    Quote Originally Posted by vncj96 View Post
    Your bi-level setting I am guessing isnt for the air, just cool or heat and your normal and max setting is specifically for ac, so this is by design, max is full ac.
    According to the controller, the a/c incorporates the "max-normal-bi level", then "Vent-heat" together, the "defrost" separate. So, the bi-level is part of the a/c control.

    Thoughts?

    Thanks for the help!
    Semper Fi :fighting0037:

    1990 1500 Suburban 6.2L Diesel 4x4


  6. #6
    Legend

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    Feb 2008
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    Red Wing, Minnesota, United States
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    My 85 chev truck only had normal and max for he ac so i am guessing one of the blend doors is not moving correctly
    99 K1500 Suburban LT "THE BEAST"
    Hypertech III, K&N, true dual
    285/75/16
    ___________________________
    Jason

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