None of the door locks in my 1964 Fury 4 door work. The doors will open and close (and stay closed) just fine from the outside or inside handles, and the key will turn the locks, but they don't lock. Also on either front door, the lock buttons by the windows won't push down. Anyone can open the doors at any time. Well, this won't do.

Does anyone have a diagram of the lock mechanisms, or an idea about what to do? Thanks!

Sounds like your door lock rods. Take your door panels off and look to see if the rods have come off or are missing. They have small plastic clips that get brittle with age. Once you have the panel off you can see how the mechanism works and will be able to figure it out. That was the problem with my E body. Im guessing this would be similar. Just my