Actually, it's to reduce the chances of CO poisioning. Many newer vehicles will have this "feature", but I'm not sure whether this is due to a federal mandate or not.
KuoH
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Originally Posted by red95svx
Some will automatically turn off recirc after 10 or 15 minutes. This is to prevent bacteria from forming in your air vents and causing a nasty smell. Why some models do this and others do not is a mystery to me.
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