Ok guys, before I took delivery of my S3 Saloon I made a good effort of reading threads about what I should do with my air con as in leave it on all the time of switch it off etc. In the end I realised that most people said leave the air con on with auto set. So I've done that since new (December) and didn't see any problems, temp was always fine. Hotter days have came so I've put my air con set to "LO" and its just not cold at all. I remember it used to be freezing in previous A3 when I didn't keep it on all the time. Have I done the right thing leaving it on all the time or do you think this is just a fault? Anyone else having a problem with this? Sure I am cursed with Audi's. First Headlamp motor fault, squeaks, engine rattle and now air con!!!