So i started to hear a little whistling noise while i was driving a couple days ago from the passenger side door. I checked the weather stripping and it was fine but today i opened the window and it made kind of a cracking noise. I can tell its not opening and closing correctly (when it opens, it tilts slightly and closes very slowly) but what i noticed the most is the cracking noise it make when i open it. What could the problem be? could my motor be burning out?