WJM,
The recirculation valve shuts off outside air so the air from the cabin is recircutated. the owners manual says to use this feature when behing a diesel truck or in instances when odors are coming into the cabin. The rocker switch on the console even has a timer built in to it. It stays in recirc mode for a few minutes then shuts off. I know a lot about this thing but I have never actually put my hands on it. Wish me luck
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