Whenever I unlock and open the driver door after the car has been sitting for a while I hear a brief 3-4 second "whirring" sound coming from the dash/radio area. It sounds like an electric motor running or something. I thought it might have been my in-dash cd player, but my friend with a VR6 and no in-dash hears the same thing. This is obviously not a problem - i'm just curious about it. Anyone know what it is?