a/c changing vents by itself

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Whenever Im driving in my calais s2 with the a/c on face or feet, and i go up a hill the air stops coming out of the face vents and comes out on the windscreen.

Anyone else had this?

[caaf]

Yes many have had this issue.. Use the search please.. It related to lack of vacuum from the result of a stuffed line or leaking actuator.