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Old 06-23-2013, 03:25 PM
The X Men The X Men is offline
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Location: MA
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Mein Auto: 2013 X3 35i
Originally Posted by noka View Post
That's actually how many think you can prevent it because it keeps air paths dry. Not 100% certain of that though. I always leave mine on auto (all seasons) and it does a good job for me whether cold or hot outside.
You can keep it dry while its running but when you shut it off, the cold air inside the duct condensate and build up moisture due to the warm temp outside of the duct. Moisture will turn into molds and mildew and soon enough, you will have that smelly gym sock smell.
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