If you look at the drivers side window of a V4 on the front outside edge about 3/4 of the way up youll notice a “wobble” in the black surround material . This apparently is to allow an exchange of air into and out of the cab and will cause some noise . As others have siad - if you can reach up to the top of the drivers door above the door on the inside and can push a finger up into the gap your door has been bent . Most usual way this happens is it being caught and blown open in the wind - simple way of checking is to check for a kink in the door at the bottom hinge . I’ve seen them being fixed both ways - bend the door or adjust the hinge , both ways work it all depends on the time and resourses avilable to you .Light bars , beacons and spot lights all cause wind noise as well.