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#1
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My 1981 300td no longer blows hot air from the center vents. The fan is blowing like a maniac but the vent doesn't open. I had the control unit (pushbutton} replaced a few years ago. I'm not sure if it is malfunctioning again or it is some mechanical problem.
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#2
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Hot air shouldn't come from center but from floor & or defroster vents. If you are getting no heat, do search on mono heat valve.
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