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Originally Posted by Steveski
What is the most likely cause of the air not blowing fully out of the dash vents on high on a '79 T/A? A bear to get to the cause or air door in question?
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As the others have recommended, probably a vacuum leak. For regulatory reasons, it is mandatory that every vehicle provide a defrost function. As a result, most systems were designed to default to defrost when a vacuum leak occurred.