Can someone help with this, please? There's something wrong with my climate control ('96 A6), and I think it must be a sensor or relay problem. The compressor itself and the fan are both working fine and the system produces plenty of cold air, but only with the system set to "Lo". If I set it to "18" or above, the system (usually) works OK for a time, but after a while it starts to blow out hot air even in outside temperatures of 25 degrees or more. Consequently I have to set it to Lo all the time and just adjust the fan speed manually, which is far from ideal. I'm not sure where to start looking for any obvious defective sensors or relays.
Jonathan