I just had the same exact problem on the driver's side front door of my 2001 Grand Cherokee. I was able to disassemble the entire thing and noted the white plastic clips at the ends of the two cables coming out of the motor assembly. I could see that the clip at the end of the shorter cable was broken, causing the whole linkage to malfunction. Chilton's and Hayne's don't make a book for 2001 Grand Cherokee and from what I hear, they wouldn't help anyway. So it looks like the general consesus is to replace the regulator, huh? Does anyone know if the replacement regulator comes with EVERYTHING? (cables, clips, and a DIAGRAM?) Please help me if you can.........