well i recently put my car back together and now that i tried recharging the ac i came across a problem, it wont recharge. i evacuatted the system for an hour then when i tried putting the new freon in it it loads a little but the comprssor wont click on. i unplugged the compressor wire and jumped it and the compressor works just fine. somthing is cuasing it not to click on. what can cuase it not to work?