The past couple times I opened and closed my sun roof on my 2014 Silverado a black rubber bellows like gasket about 1 foot long on the right side came out of its track and jammed it up preventing it from closing. I slipped it back in the first time but now it tore itself apart and I had to pull it out in order to close the sunroof. I'm assuming both sides are rotten at this point and need replacement. Seems like a very short life cycle to me seeing as I bought this new just a little over two years ago. I did get a full warranty so we'll see just what that was worth...
This appears to need to slide during normal operation. Might some silicone be necessary? What is it's purpose? Rain/noise or both? Is it even necessary?