Crack down from back window center. I've noticed that a majority of Explorers have this problem. A Ford tech says he sees it all the time--an engineering problem. I asked about getting it fixed, and he said the way that it's made, it would just do it again. I asked about a recall from Ford, and he told me, I'd have to pay out of my own pocket to get it fixed. Since this is such a common problem, too bad Ford doesn't provide a fix.