I have a 2011 JK 2 door and my ac keeps cycling in and out of recirculate causing the windows to rattle and what not, also makes a high pitch humming noise when doing this. I have taken the glove box out and you can watch the "flapper" door open and shut while driving. The dealership is no help and say the noise is probably wind noise If this is true then why is it intermittent. I should also note this is not my first JK and never seen this issue before. Thanks in advance.