ahve a after market a/c system for a yj. System is charged right, no leak's, have put on a heavy duty fan clutch, have put on a shroud fan in front of condenser unit. while i'm driving air is ice cold, and work's fine up till about 85-90 degrees.after that ever time i stop, it short cycles on and off at the red light or sitting still. when i take off again it get's ice cold.it was 110 degrees the other day, and i put a swamp cooler in front of jeep, it droped the tempture about 100 degrees and the air stayed on the hole time.don't know what else to do? or is that going to just be the way it is?