How to replace the cables on a window of a 1994 Mercury Grand Marquis?

The cables cannot be replaced alone. There is a power window regulator, which is the center track, cables, and spool for the cables. This part can cost from $50 to $180. The best thing to do would be to pay some one to install it for you. Unless you are very patient and have small enough hands, it will be extremely difficult. The dealership will charge about $450 for the parts, labor, and taxes. Not a fun thing to go through :(