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Originally Posted by Walrus
Recirc of heat in the winter can allow a build-up of moisture from passengers' breath, etc but should not present a problem except in extreme cases (back seat at the drive-in?)...
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Actually, here in the midwest where it sometimes gets very cold, it's not uncommon to see drivers (of non-MB vehicles) driving in the winter with their windows completely fogged up
from the inside simply because they've left their recirc button on all year. MB engineers very wisely designed the system to not allow the recirc setting to stay on > 10 min when ambient temperature is cold.
You'd be surprised how much water vapor each of us exhales; in the small space of a closed car, it dramatically raises the relative humidity if you don't bring in outside air in the winter.