93, 266,000 miles Old ranch truck. The driver door lock does not work. The manual lock on the inside will not go up or down. By the smell, it is a good bet my Dad poured a quart of oil down and probably sprayed at least one can of wd 40 inside trying to make it work. The key turns the lock kind of--it just that nothing happens and it feels nothing is moving. The door latch opens and closes fine. It looks like I can buy a new lock for around $20 dollars and much easier to install than a complete handle. With the handle working I am thinking it may just be the lock. What are your thoughts anyone?

 

nothing about working on these doors is "easy" lol. Not that it is complicated, there is just no room and you almost have to work blindly. It sounds like the linkage is probably either rusted badly or it is binding for some reason. Take the door panel off and try to take a look at it before you buy anything.