Thanks for the help! You were right on the money. The Aux fan runs constantly and if I unplug the 2 brown wire conector from the sensor the fan stops and the AC works. Unpluging the single wire conector does not help. So.... how do I determine if it a bad sensor or something else? Is there a way to test the sensor? thanks again. As far as the car wash goes, I did not know it was a crime, futhermore there were no signs posted about it.