There is an air deflector valve/plate under the dash that directs the air to the defrost vents or the floor depending on what you select with the controls. Sounds like this deflector plate is binding and the vacuum control can't budge it.
There is an air deflector valve/plate under the dash that directs the air to the defrost vents or the floor depending on what you select with the controls. Sounds like this deflector plate is binding and the vacuum control can't budge it.
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