I have an 1993 Ford Tempo, and upon examining the lock mechanism (sans disassembly) we suspect the actuator is the problem. Sadly, I can't seem to get it out.
On all doors, the motor seems to be held in place by some sort of connector. However, this is not the same across the front doors: the left side door has a plastic cap that goes into the hole; nothing really seems to stick out of the hole. The right, side, however, has some sort of metallic thing that spins freely.
Is this a rivet? Do you want a picture of it (or the motor)? Someone at the parts store suggests that the motor is supposed to snap out of the plastic holder (which is what is ACTAULLY connected to this little hole) but it does not seem to.