Filter under Back Door???
Posting Guru
Joined: Sep 2001
Posts: 1,539
Likes: 3
Just looked at the upper rear door at the top center, I think this is what your talking about. Its actually not a filter just a rubber flap that goes over the h ole to keep water/dust/junk out. If its what I think it is its a pressure relief for the cabin, most cars have one somewhere, my camaro is on the drivers side in the hatch area for example. This is used for when you slam the doors shut in the truck the built up pressure has somewhere to go, otherwise with how well new cars are seled your ears would pop possibly, or youd get some pressure on your head that might be unpleasnt for a half a second. Also helps with the wind buffeting when you only have certain windows open I'm told but cant confirm nor deny that part.
