I'm not sure if someone has mentioned this before, but has anyone else noticed how the front vents turn on when the sunroof is on vent or open, even with the HVAC off? I had my sunroof vented on my way to work this morning and felt it. I thought maybe it was negative pressure pulling air in towards the dash and I was simply feeling it blow back, but that wasn't the case, as I could close the vents and the air would stop. It did the same thing with the sunroof all the way opened as well. It seems to be speed based also, as the slower I went the lower the air blew, all the way down to stopping entirely at a complete stop. Interesting.