Why does vehicle a/c fine-tuning to defrost from vent by its self when agree to stale of gas it returns to vent?

2002 expedition

How do you verbs down the hindmost...



Answers:    it is most likely the small vacuum control for the spring loaded vent door. when you consent to up on the gas the vacuum increases and holds the door in place till you bestow it gas and the vacuum drops and the door moves. have the vacuum lines and the vacuum controlled switch for the vent door checked.

Oil fluffy?


Hole or split within a vacuum line.

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