I need more detail as what other symptoms you are have like do you hear the compressor come on when the a/c button is pressed,etc. There is a way to jump a switch to rule out the compressor. If the compressor is not on just go the parts store and get a can of 134 and try charging it. If the compressor comes on then you have a leak.Then by a can of u/v leak kit and find the leak yourself.