i made a thread that shows you the part its called the high pressure sensor. if you unplug this thing and your fan is good and you have your ac on max it should through the fan into high gear so if not then most likely you have a bad fan. and its a 300 dollar fix that you can do it yourself. just take plastic bumper off then lossen the metal bumper and the fan and the whole assembly will slide down and out. but do a search on here and youll see many threads