I don't think there is a way to get natural air flow from outside without the HVAC being turned on. It's a complaint I have had since I owned the car. When the vehicle is at speed, the X1 should get free flowing air in the cabin but I never feel air coming through dash vents. I don't think the system is passive. I think the fan has to be engaged. There is no button that allows air to flow in the cabin w\o fan assistance. Can anyone confirm?
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