Try this, grab the back of the window while it is half way down and pull up. If it goes up about an inch or so the rear clip on the regulator has let go. If it feels tight (which you can check against the other side front window) then I'd use the silicone spray to prevent it from failing soon.

But odds are, it is the rear clip of the regulator.

__________________
"When you do things right, people won't be sure you've done anything at all" (Bender, futurama)

You make something idiotproof, they'll make a better idiot

You think professional is expensive, just wait until you pay for amateur.

Never let your sense of morals prevent you from doing what is right.

Examine what is said, not who speaks.

X5 pics

RIP 4.6is.....

2003 4.6is