Hello, This Blazer has been this way a couple of years. 2001 2WD 4 door. The driver''s window when rolled up all the way goes off track slightly out side the track at the top. It isn't much of a problem, but will not keep rain/water out. You can hold it in with your finger whilst rolling up until about an inch (25.4 mm) from the top, remove your finger, finish rolling it and it will be in the track. I had to remove the plastic rain guard because the off track window was slowly removing it for me! I plan to remove the door panel and look around, but thought I'd see if anyone here has input/experience with this issue. Thanks! P.S. - I am showing my age using "rolling" for windows!! Actually my father has a 2008 Toyota Tacoma that has manual window cranks.