Okay....my passenger window will not close and seal fully......the window motor is still strong and rolls the window up and down no problem.....it just getting to the top and where it should seal, it makes a "kunk kunk kunk" noise and leaves about a 1/4 inch of it not sealed.....I play with it and I can get it to about an 1/8 inch but here's my question before I tear my door panel off......

Is this a tracking issue or is it the motor......do I need to lubricate the track or is there a band that might have a stretched hole that is causing this not to close properly??? I want to keep the cost low if I can......can someone give me some insight before I tear into this issue.......what is causing this???

Thank You