The Kia Sorento panoramic sunroof is vunerable to fouling and corrosion of parts if it spends time parked outside, under trees, in a wet corrosive or marine environment. I have had to replace the 2 external side brackets for the moveable front glass after the slider feet began disintegrating and making crunching sounds. Hopefully this vid may give you a heads up on what you need.
![](https://s2.save4k.ru/pic/dFi-nuDm1OM/maxresdefault.jpg)