Recently I removed my window regulator to replace the front glide ( vent window to drivers glass) while it was out I cleaned the entire unit in a bath of paint thinner. BIG MISTAKE!!!!!
it got clean of years or collected dust and the old dried up grease BUT it also got the grease inside the tension spring and brake parts in the cup that the stem the window crank attaches to is mounted in.
(I am sure I'm not calling them the correct names but without the brake parts you would be able to roll the window down just by pushing down on the glass.)
After I bathed the regulator it made A LOT of noise going up and down. It is better now but still noise then the untouched pass side.
Long ago I had a 56 ford pickup and one window regulator was super stiff, so I drilled out the rivets and removed the cup with the spring and brake partes in it. Anyway I cleaned and lubed the parts up and it went up and down like butter, problem was I lubed the brake parts as well so now it would also push down from the outside.
Moral to the story keep solvents out of the cup and do not overly lubricate inside the cup.
I had to do A LOT of adjustments to get the glass to slide up and down easily after reinstall.
