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Q: A/C and heat will only blow out of defrost vents. How can I fix this problem? on 1995 Cadillac DeVille

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Most of the time the A/C air comes out of the defrost, but sparatically it will come out of the regular vents for a short period of time and then it goes back to the defrost vents. The heat always comes out of the defrost vents. I have tried checking for vacume leaks and didnt find any that was obvious.
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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sounds like an accuator door is binding...Try to operate it by hand...The diaphram inside a module that operates the door may be leaking vacuum.
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