96 LT4 A/C question
 

96 LT4 AC unit not working. This happened overnight, worked great yesterday but today just blowing warm air. Compressor clutch keeps kicking in and out. Checked all obvious fixits. Freon level is good, changed out the compressor cycling switch and no change. I hear that there are three relays that work with the ac unit that could cause this reaction. Does anyone know if this is correct and if so which relay it would be and where it's located? thanks, Chuck in Florida.