That is very odd. Maybe a computer/electrical related hiccup with the parked car ventilaiton.

Don't use the parked car ventilation much. Too many steps and too slow to set. Mercedes has a cool feature where you simply just press a button and the car wil ventilate itself for a bit after the car is turned off. Great for quick runs inside a store. But kinda different from the parked car ventilation's goal.

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2008 X5 4.8
White w/ Black Interior w/ Bamboo Trim | Premium | Sports + 214" | Tech | Cold Weather | Rear Climate | Premium Sound | Active Vent Seats | Heads-Up | Comfort Access | 3rd Row | Aero Kit | Huper Optik Tint | Clear Reflectors