My CLS has a habit of misting up as soon as it rains or gets damp outside. I don't like running with the aircon on in winter, so I set the climate control to Auto - Auto and kill the compressor. I've tried turning up the fan, directing it upwards, but the only way to clear the screen and side windows is by turning on the aircon compressor, or hitting the "demist" button. Any ideas ? Are there any vents at the rear that I could check ? The external air excluder button works OK, the manual isn't very clear, but air is excluded when the red light shows.
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