Quote Originally Posted by alleycat
Before taking the door apart try that silicone spray yu could buy at Pep Boys. Get the name from this site. Worked just great for me for the slow window I had. 6 months ok now. Just a thought. . .
I had the same problem and started using silicone spray and the window has worked for over a year. Get the kind with the long thin applicator so you can stick it into the track.

I redo it every few months.