I've been talking to KIA about this issue for a while now... It is definitely a manufacture's defect.. The cause is excess plastic on the painted side of the covers( parallel to the door window). there is a tiny plastic ridge there so when air hits it, it creates a high pitch noise. You can do 1 of 3 things.
1. Sand it down, and repaint
2. Put tape over it (my temporary fix)
3. Talk to your dealer
My dealer told me something about quality control looking into the problem.
KIA has been very slow about this issue...
