2000 Mustang, door locks are not working. They seemed to have stopped working over night, the passenger side sometimes will work the drivers side will not lock or unlock. It clicks like it is opening. The keyless enrty won't lock or unlock them either. Any suggestions?
It's the actuator. Search for a thread about 2 weeks old which in detail describes how to replace it. Or go pay ford $150/door for labor, plus $50 for the part.