3 windows with the same problem? Rare. Something binding? Are you able to "help" the window go down some more when pressing the down button? Don't force it, just give it some help and see if that does anything. If not, and nothing is binding....sounds like regs.Three of windows on 1998 S420 can be rolled down only a little bit and up but not all the way down. Must I order and replace regulators or there could be other reasons? Thanks.