I have a 2006 E 350 and with the a/c on the passanger front and rear blow cold and the driver front and rear blow like the a/c is not on. this is the standard climate control, not the 4 place digital one. the dials are both turned down to the coldest setting. is there a possible sensor disconected? Someone worked on the car and left some wires under the hood unplugged, so I connected all that I saw. Any help is appreciateed, Thanks so much!