I think that you are on to something. I know the a/c clutch is electronic, but I don't know about the radiator fan. Please let us know if you figure something out. I know that the older BMWs used to use a 12 v. "auxillary fan" to help out the a/c system. The simple fact is that when the a/c wants to it is capable of spitting our some damn cold air. Mine has odd flucutations even at speed though - not anywhere near as warm as at idle, but definite fluctuations.