The driver side front window on my 1999 Grand Prix GT has stuck in the down position. I thought it may be the window motor, so I switched it out with the rear window. The motor worked there and the window went up and down with no problem, but the front one still won't work with a good motor. So I'm thinking it must either be the switch or the regulator. How do I find out without having to purchase both, and is there a way to manually get the window closed in the meantime?