Window trim rattle/vibration

[Donmatteo]

Weird how rolling the window down a bit then up helps some. I’m having the same issue

It's air pressure related. The weather stripping catches the air and starts flapping.

Add the felt like I did. It changes the aero over it and seals the gap which causes it.

 

[Dev]

It's air pressure related. The weather stripping catches the air and starts flapping.

Add the felt like I did. It changes the aero over it and seals the gap which causes it.

Did you add the felt to the top or side of it? Can’t tell by pic