If I'm not mistaken, there is a "fresh air" feature on the S40 that allows you to direct air to your face through the center vents, even though the climate controls are working to warm you.
It's used for keeping drivers awake in cold climates when the warm air from the heater can make you drowsy. By having this venting feature in place, it is supposed to allow cool air to your face while you drive.
I believe the lever in the center stack which is an up and down toggle controls this function. The lever in the blue position allows outside air to vent in; the lever in the red position should shut it off.
That's what works on mine.
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