Without pulling Door panel, it would be hard to say.If you hear the Motor, when the switch is pressed, the Glass may have come off Regulator.Otherwise, the Motor or regulator could be the cause.If you need further, let me know
Door Panel
Aftermarket & Factory Electr&onics
Ford, Chev Cert, Heavy Line Mech, Mobile Electronics.Sales, Installation & Repair for 30 years.