A/C has been working perfect until today. Stopped blowing cold. Blower working, Belt still on compressor. Just quit, no gradual decrease in performance. Not sure which fuse controls power to compressor but all in fuse box are good. Is there a relay for the compressor and if so where is it located? Stopped at a shop and they did not know about fuse or relay, but did check and found that Freon was not flowing. They stated that if there is a fuse or relay problem and the compressor is receiving no power it would not work. The compressor is one of the type without a clutch which has some form of internal sensor. I am totally lost. Any ideas would be greatly appreciated. Only vehicle and needed for work in a very hot climate.