Originally Posted by RamSport84
turn on your a/c. sounds counter-intuitive but it removes the moisture from the air and will keep this from happening.
The A/C in the Rams run automatically in the winter, they do so to prevent the exact problem you are describing. Perhaps your A/C unit isn't turning on (blown fuse?) I'd be having a friendly chat with my service department if I were you.
I'm having an issue right now with a mould smell on start up. In our discussion the service guy told me that the A/C unit runs momentarily to rid the system of moisture (no window frost-up).