Please fill out the following to ask a question. MAKE:Chevy MODESilverdao 1500 YEAR:2012 MILES:47,000 ENGINE:5.3 DESCRIBE ISSUE....When I turn on the fan on my truck's AC unit and while it's in recirc mode cold air starts to blow as if the AC is actually on. Also whenever I switch the vent to defrost or defog I only get air blowing out from the vents facing the driver and passenger sides only. I can never switch the air to blow out from the windshield and floor areas via the AC control panel switch. I was initially going to bring my truck to the Dealer to have them do a diagnose but they were asking $130.00 just for an initial diagnose. Please help.