Door Lock Vac??

[zsmith29]

Hey Guys,
I have a 1984 300 D Turbo. I have no power any of the locks at all. I have to manually press the knob down after I take the key out (if I press it down while the car is running the vac slowly depresses the knob and it rises up). Then I start the car and drive it around; all the locks go back up and unlock. The drivers door lock will not go down at all, the only way to lock it is to actually put the key in door and lock it from the outside.
Does anyone know what it going on with this?? Any suggestions would be greatly appreciated.