Just been in my first traffic jam with the 500 and demisting the windscreen was a nightmare. I don't have the auto climate control just the manual version. Changing the fan speed knob makes no difference at all, i can't feel or hear anything. How quiet is the fan? should i be able to hear it? The air conditioning seems to switch on but changing the fan speed knob or air distribution knob makes no difference. i have checked the fuse (f08) i think, am i missing something or is it broken?