I was experiencing an annoying rattle at speeds above 60 MPH in my '11 Sportage SX. It sounded like crackling, and was coming from around the passenger A-pillar. As speed increased, it got more noticeable, and didn't seem to depend on the road surface at all, so I figured it had to be something wind related. After searching the Internet, having the dealer poke around, and messing with a few things on the exterior, like the mirror, myself, I couldn't find a solution. I finally noticed that the seal at the back of the fender, which is a long thin plastic part that fits into the space at the front of the door (Part 3 on the attached diagram) was loose. I took a chance and took it out (the space is really tight, so it was a bit of a struggle to get the three fasteners out and to pull it out from between the door and fender - be sure and put some masking tape on the body to prevent scratches and scuffs). I then stuck some thin (about an quarter of an inch) self-stick weatherstripping from Home Depot on top of the paltry foam strip that was around the edges of the part. It was even harder to get it back in, but the hassle was worth it - the rattle cleared up entirely.
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