When driving down a gravel road the interior fills up with dust, coming from the rear seat area. Looks like it comes from around the back seat shoulder harness on passenger side. Dealer had no roads to test it on so problem is still happening. Talked to a girl who has a Malibu that does the same thing. So much dust will come in that it chokes you up, will have to roll down window to get air. Everything is covered with dust mostly the back seat but goes all over. Dealer said they had a rep from chevrolet come in town and they would call me with a solution on Thursday but it is Friday and still no call.