Long time owner of the 300 models. Sometime last year I picked up a 2014. About 6 months ago driving to work my heater at the time would blow low then high. i could hear the recirculate door opening and closing. Ignored it as it stopped a few days later. Now in the middle of the hottest month in AZ I no longer have a recirculate button. I suspect a actuator went bad or something but I'm unsure were it is etc. Every time I google it I get the blending actuators.

Anyone have some things to check before i take it into the dealer? Fuse or were the outside air door motor is?