I was having problems with the zipper on the rear window. It was not going in right and the teeth were skipping. I was trying to get it back to the starting point and while I was pulling on it the top of the two zippers snapped in half. I don't know if I need a new rear window because the zipper teeth are messed up or if I can just replace the zipper. The teeth all look fine. None seem to be missing but it kept skipping teeth. I am hoping I can just replace the part of the zipper. Any help would be greatly appreciated. I am hoping it stays dry and warm for a while.