Hi there-can anybody tell me if the heated mirrors on my facelift S4 are always on? I assumed they only came on when the heated rear window was on(like on my old S2) but mine are always on! I had a slightly embarrassing experience a couple of weeks ago when my friendly MOT man became slightly less friendly as he leaned against my drivers mirror and yelped cos it was so hot! i assume there's a thermostat not working, but I was surprised it was on at all as the HRW was off? Any info greatly received.