Take the cover off inside, and make sure noting is in the way of the air plenums. I had a piece of duct tape come loose on mine last year, partially blocked air flow, and she froze up. Fixed it, and no problems since.
Cover may have some screws under little round buttons covering the screw head. Pry the buttons off with a pocket screw driver. Will be a square head screw also.
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT