Evening. I've just bought a 51 plate A4 avant sport 3.0 V6 quattro and the A/C is playing silly buggrs. If I put it down to Low it blows cool but as soon as I put it up a notch to 18 degrees it blows warm and continues to blow warm, as if there aren't thermostats picking up the right temperature in the cabin or something. I have the same issue on both sides independently. It's really annoying me because if I need to defog the window i'm stuck on cold or roasting hot.
Any advice very much appreciated