hello i just bought a mustang 04 GT a month ago and i have a lil problem

see my driver side window will not go down for some reason... when i push the down button it makes this "cliking" sound.
but it will not go down...see this same problem happened to me about a week ago but then a few hours later it started to work fine... does anybody know what this is? thank u everyone.

 

most likely a problem in the wiring....unless you know your wires take it to a local body shop and theyll fix it right up....

 

The clicking sound is most likely the plastic gears in the motor grinding. Very common problem in ford power window motors.

This is what they are made of.

 

so i would have to replace this then?