[MagnusT]

If it's cold damp weather and I park the car ten minuters or half an hour, when I get back and start the car all windows are immediately, in a few seconds, totally fogged up. I have to sit and wait between a minute or two before I can see out at all again.

All my previous cars have fogged up if my jacket has been very wet or snowy. But this is something different, I can come back to the car from indoors, very dry and this still happens. Another difference is that in the M2 it fogs up the second the fan starts. I don't recognise this from other cars where it has at least taken a handfull of seconds more before fogging up.

BMW has checked the car but all electronics and mechanicals in the ventilation system reports back with no errors.

I'm not sure what I should do next.