To add to what aleekat wrote - I became involved with Volvos in the mid-70's and worked at an "indy" Volvo shop in the mid-80's. Back then I had to deal with many lower window channel issues on the then aging 140 series population. To put it simply - the 140 channels would rust away so removing them and installing new channels was common. Removing the old channels was a tedious chore - so much so that when confronted with a broken window it was cost effective to simply install a new channel on the new glass. 240 series-and later-window channels are made of better material and I can't recall ever having to replace a channel on one. As aleekat mentions--any alignment problem would be in the linkage and adjustment of the window crank assembly. -- Dave