Quote:
Originally Posted by Sportstick
An MB Tech eventually signed on the forum and explained that the automated system includes a drying cycle, and manual usage defeats that, allowing bacteria to grow and requiring a duct cleansing procedure to get rid of the odor. That alone made the AUTO setting desirable. Not sure if BMW works the same way or not.
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That issue is not exclusive to Mercedes. I try to remember to run the A/C at least 10-15 minutes weekly, even off season, in all my vehicles for that reason, and also to circulate the refrigerant through the system as it lubricates components such as seals and gaskets, and keeps them from becoming brittle and leaking.