All of the sudden, the door on my 2001 GT stopped shutting properly. I noticed the window isn't sealed all the way when the door is shut. So i rolled it down and rolled it back up with the door shut and it seals fine. Is something with the window knocked out of place or what?

 

sounds like a worn hinge pin

 

how big of a deal is that to replace

 

I have the same problem with mine.
You need to replace the window seals ( the rubber that your windows rolls up into ). It wont shut because its hitting somewhere.

 

Well before trying to do it, try this as a diagnosis. Try to lift the door up and shut it, if it closes properly its the hinge pin. IDK how hard it is, Im assuming you will have to remove the door to do it (or at least make it a hell of alot easier) Also to test the weather stripping theory, try to work the stripping around the window back into position and then try the door again.

 

i have the same problem and what i have found is the window at the back of the door has come lose from the regulator. they glued it from the factory, it looks like hot glue but i sure its some type of epoxy. i have tried to epoxy it back together with a number of different types and after about week it brakes agian. the only other option that i have found is to replace the windows because both of mine are broke