Rear Window Regulator Right - 51358212100If the cables are worn and rust is present, the window regulators will not be able to function. The same can be said if it has fallen of the tracks. If you notice grinding or rattling, if your window is clunking and clicking on the way down, or if it simply wont operate at all, replace that worn out regulator. These are side and door specific. Please assure proper application while ordering.