Just jumper the cycling switch located on the drier, does it turn the compressor on? If not then reconnect it and jumper 12 volts to the compressor wire from the back of the alternator mounted right above it. Does it run and blow cold in the car? If so you will probably find that you have a defective A/C control panel. Rebuilt panels retail for about $600.00-$700.00 or you can take your old one apart and fix the obvioulsy bad solder joint in it. Take the panel out of the dash, remove the tin cover that goes over the circuit board, remove the four screws that retain the board, turn the board over and find the bad solder joint, get the solder and iron out and fix it and you are in business.