It is due to acoustic resonance. The same thing happens when you blow into an empty bottle just right, it makes a noise. Blow too slow or too fast the resonance stops. Same thing happens with the wind blowing into the open sunroof. At just the right speed the wind blowing into the sunroof matches the natural frequency of the open volume of the inside of the car.Has anybody noticed that when the sunroof is open, there is a terrible ear popping ... thing going on? I don't know what to call it, but it can make my ears hurt unless I open a couple windows. Will a windscreen take care of this problem?
I have a four door
Wondering if 2 doors have this problem.:dunno
You can either adjust the opening of the sunroof, i.e. if it vibrates when fully opened just try closing it one notch at a time until the vibration stops, or you open one of the side or rear windows. Another thing is to either speed up or slow down. One of these three methods will change the natural frequency of the inside of your car and stop the acoustic resonance.