New to this sight, bought 1993 YJ jeep to play with after retiring .unit charged. no power to compressor. unless jumped from battery. Jumped low pressure switch at dryer still doesn't come on. Fuses and relay good. fan and compressor switch good. ground on compressor good. jump compressor with hot wire ,compressor kicks in. will not blow cold air. .Started this three days ago. had half can of 134a put in working good turned off A.C. Go get another can from store, came back to finish .Has not worked since .
THANKS FOR ANY HELP