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Car Talk had a good description of the the process at work. Here is what I remember: Rear windows and most sunroofs are located at a point in the car's slipstream that are under positive pressure with respect to the interior. As the air enters the inside of the car, the pressure builds until it is equal to outside slipstream and no more air can get in. It then spills out with a little help from venturi effect, then the process starts again.
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