Didnt know where else I should ask so here it goes.... air intake ?? when I drive for a a little while like 15 min or so and I turn the jeep off theres a slight whistle sound coming from under the hood, same thing happens if im putting it in drive from reverse...I took it to the dealership and they said its normal that the air has to go somewhere????? is this true or might there be a slight problem..??? its a 2012 jk sport 4 door. someone please help me with this!!!

 

I just traded in a 2009 Liberty that did the exact same thing. It would lose about 5 minutes a month if you would let it. Took it into the dealership and they couldn't do anything about it. Just one of those things you either live with or you put in an aftermarket stereo that knows how to keep time.