Hey guys, I posted this earlier on the general topics forum before realizing there was a more specific forum for troubleshooting. I live in Phoenix and tend to run my A/C for quite a few months of the year. For at least a few months now my A/C seems to have developed a mind of it's own, it randomly decides to switch from blowing out of the forward facing vents to blowing from the defrost vents, and when it blows from the defrost vents it blows ice cold out of one, hot out of the other. Sometimes it works totally normal for a week, with full control of all functions, then, out of nowhere it just switches to defrost vents without me touching anything, then, randomly back to normal on occasion. I should add that whenever I get in the car I hear a small motor whine, which I am guessing is one or both of the air directing units moving. Since it continues to switch back and forth, I'm thinking it is likely the control unit rather than the parts that it commands but would like to be more certain before juggling parts. Any helpful tips would be greatly appreciated.