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Does anybody else find that during the winter months, their windows tend to mist up unless the aircon is on or a window left ajar? I have heard about the F10 yellow grommet causing water ingress in the n/s/r footwell. My last E60 sunroof drains sometimes got blocked resulting in water in the boot, and my previous 7 series suffered from clogged front scuttles, which let water get into the front footwells, but I don't think this is the problem with my F07. I can't actually find any evidence of water inside the car, so could it be something to do with a faulty EGR cooler (which I think is leaking) causing moist air to come into the cabin? Another thing I had with the E60, was the air recirculation valve failing into recirculation mode, but I think I can hear mine working. The A/C works fine, but if I leave it turned off on a cold and wet day, the windows steam up after a few minutes. I always have the fan running at least on low and as many vents open as possible.