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There is a vacuum switch located behind the dashboard climate control panel. When the vacuum system develops a leak you are unable to change the flow diverter. The part itself is cheap, I paid $17 at a dealer for it but you do have to remove the control assembly to change it out. If you listen carefully you should be able to hear the vacuum leak.

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Q: Why does hot air continue to blow out of the vent and the heater on a 1983 Cadillac DeVille no matter what the control is set on?
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