my cars AC hasnt worked for two years now and just the other day it decides to start working!? so im thinkin that there is a problem with the switch that moves it from the heater to the AC? does anyone know anything about how that part of the system works? theres a little valve under the hood that has a vacuum line coming from the intake, through the valve, then into the fenderwell. this little valve also has two or three wires in it. mine just hangs there, doesnt look right? i have no idea what its for? but im thinkin this thing could be the problem?