I just picked up a 88 or 89 blazer and am starting the teardown and rebuilding of the interior.. When i was there i noticed the passenger windows down but it will not roll back up.. What could've happened? I am very experienced with turning a wrench but have never had to do any kind of work on windows so this is all new to me and just kind of need a idea of where to start.. Thanks in advance

 

CLean the rail, grease every moving parts. see if the arms lift together. Best option new motor.