Good Morning! I took my '97 A4 quattro to a local garage and had then check the air. Compressor turns on, no leaks and they filled the freon. It still will not come on. Any ideas? Fuse maybe? The manual shows where the fuses are located but where are the sensors located to have it checked and can this be done by a non-pro? Speaking of sensors, is there a manual on Audi's where they give a schematic of where the sensors are? My manual gives a fuse directory so that part is easy. Any help will be appreciated!