My S3 Saloon is now 6 years old and in all that time I've not really had an issue with heating. I've always had the right hand control set to A/C and the left hand one to Auto. The individual thermostats are set at 74degF on the left (my wife is a chilly mortal) and 70degF on my side. My expectation has always been that, with everything set to automatic, the cabin temperature would at all times equate approximately to the levels set, ie. 74 & 70 respectively. We've never had any problems, until earlier this year ... We were staying up in the Derbyshire Peak District for a few days in September and going off out early in the mornings. On a couple of occasions we desperately wanted some heat a mile or two down the road (always allowing time for the engine to come up to temperature), but try as I might I was unable to fathom out a way of filling the cabin with warm air. In the old days you just whacked up the heater control and warm air came as commanded. These days, with so much out of the driver's own control, we seem to be reliant on the vehicle to make those decisions for us! Can some kind soul please enlighten me how I can control the level of heating in the car. The massive manual does not make it at all clear .. we tried every which way the book instructed, but to no avail at the time. It must be possible to do this whilst simultaneously having the aircon turned on, otherwise how else do you prevent misting up in the depths of winter? Ever since aircon became a thing in cars I've always had mine turned to 'On' all year round. Advice here would be most welcome .. thank you.