mine was easy to figure out. I charged my a/c and a week later it didnt work. so i looked around for leaks, and my switch was pissing
Another way to tell would be if you have a known good charge and your compressor doesnt come on. then you can jump the terminals/ or take an ohm reading at the switch. I dont know what wires to jump or what the ohm reading should be cuase im not one of those guys on the network that knows everything.
