Loud pitch whistle noise under car when in gear, but no noise when I stop.

SOURCE: when window is down, i get a high pitched noise in the cabin of the car

This is got to be the best one I've ever tackled! Got a few questions, does changing the position of the window change anything? It could be the door seal on another door or window that in inducting a third vent and causing it. It could very well be something in your vents, got children? Try changing positions of vents or get someone else to drive while you play detective. Almost be willing to bet that if you get someone else to drive while you hunt it , it want whistle. Technically speaking Air has to pass through a certain size orifice or be bent to a certain angle and pass faster at one area than it is in the other areas, if that makes any sense. It didn't to me when I read it. Sorry I can't be of more help but look at the good side, it'll keep you awake while you're driving!Not much help on this one~Gillight