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HVAC adjustment or ...

Discussion in 'The Garage' started by Wingnutt, Dec 16, 2005.

  1. Wingnutt

    Wingnutt 1/2 ton status

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    should there be a bit of warm air coming out of the dash vents when the heater is on? I replaced that d*mn plastic "arm" that controls the blend door, but no matter how I adjust the arm outside the heater box wher I *think* it should be, I still get a fair amount of air flow out of the dash vents. With the defroster on, I get very little hot air out of the deforost vents, more is actually more air coming out of the dash vents! If I adjust the control arm so that I get a decent flow out of the defroster vents, when I set the control to vent, things get into a bind and the control arm slips in it's holder. If I move the adjuster arm where nothing is binding, the blend door is open about 1/2" allowing the air to flow out the dash vents. Needless to say, this is driving me nuts!:mad:

    Does anybody have any suggestions, or am I missing and adjustment somewhere? TIA
     
    Last edited: Dec 16, 2005
  2. opfor2

    opfor2 1/2 ton status

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    I have the same problem on my 90.
     
  3. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

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    The foam seals on the doors inside are infamous for rotting and not sealing in any position. Your rigs *seem* to new for this,but you never know.
     
  4. Wingnutt

    Wingnutt 1/2 ton status

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    Anybody else?
     
  5. outsider223

    outsider223 1/2 ton status

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    I have the same issue on my 90. Seems no matter what setting the controls are at, most of the air comes out the vents. Any help?
     
  6. xpoc

    xpoc Newbie

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    When I first got my 89 I had this problem I took off the dash finding that all the platic tabs holding the ducking together had broken. So I glued everything back together ziptied the flex elbows on and reinstalled everything it improved it signifigantly.

    also check for holes in the ducting

    gl
     
  7. Wingnutt

    Wingnutt 1/2 ton status

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    One more bump for some additional ideas. TIA
     

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