Quote:
Originally Posted by Sportstick
I don't know about fuel consumption vs. compressor with/without open windows, etc. But, I do know over at MB, there were lots of folks with complaints about moldy odors coming out of their HVAC. To a person, they were all folks who manually controlled their automated system. 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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Common in BMWs as well. I turn my A/C on at least once a month during the winter to keep the ductwork dryed out.