My A/C is giving me hella problems. Every once and awhile it wants to blow cool/cold and for no reason it wants to blow hot. No wierd sounds or warning, it just doesnt blow cool. Took it to three different shops and got three different answers. One says the blower is shot, one says the compressor is out and the other says the controls are malfunctioning. Tired of the money hungry grease monkies I'm taking it into my own hands, just need some advice and a starting point