So the other night I realized that the heater only works on the driver side of my wifes 04 A4. We tried adjusting the temp for that side all the way up and down but it is always cold on the one side no matter what we do. After looking at some parts fiche pictures I'm figuring that it is probably either one of the temp sensors, the air distributor, or the control panel itself. Just wandering if anyone else has seen this issue or might know what it is.