My a/c will only blow out of defrost vents when knob is turned it rebounds back
What is your question?
When I turn my /c knob to the left for face air the knob wants to rebound back. It will only go as far as 12 o clock position then when max a/c is turned on sounds like some valve is trying to open making a knocking noise and air only comes out of defrost vents!!
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