My a/c stop working when I acelerate,the air goes to the defrost and the legs

What is your question?

When I acelerate my adrenalin v8 2010 the a/c stops blowing from the front vents and change to the defrost and the legs.Every time I acelerate I hear like a vacc noise on the passenger side.My sportrac has 2,090 miles right now,it is new

What makes this problem better or worse?

Every time that I acelerate

How long has your 2010 Ford Explorer Sport Trac had this problem?

Ever