For heat recurculation: (/cabin recirculation on hot days)

If it is winterm and you have the heat on, and you drive for quite awhile, and lets say you make a quick stop, at the dry cleaners or gas station for example, you turn off the engine. The climate controls should go blank. Press the fan up button. The display should spring to life, and it will have three curvy arrows plus the word rest on the display. It is now blowing the reminder of the air thru the heater and into your car. So when you return it is not as cold.

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