What’s up everyone. New member here. Figured you guys would know best. I have an 89 Z28 and the locks don’t seem to work when I put my keys in the door nor do they work from the inside. I took the panel off of one door and noticed the rod that connects the lock to the latch doesn’t seem to budge. The key turns in the cylinder but doesn’t work at all when attempting to lock the door. My question would be do I have to replace the latch on both doors? They seem to be seized from letting the locking mechanism to work.

 

Have you look in the door to see if the linkage from the key lock to the latch is moving.If neither linkage (key/slider) moves maybe try spraying some degreaser/brake cleaner to see if that frees up the latch.Could just be jammed with crud. Does it have power door locks? That could be another source as there is a linkage of sort that connects with the slider linkage.
Are both locks not function the same way?

 

from what I’ve seen the linkage is connected. They are power locks. I’ll have to check the power linkage as well. Wasn’t too sure about that. I’ll def hit it with some degreaser as well. Thanks!

 

Technically, the lock is part of the latch. And the lock/latch functions have redundant controls (inside/outside lock, inside/outside door handle). The power lock solenoids just yank on a 90* bellcrank that slaps the lock rod to the inside ****.

Get in the door, study the linkage, then determine where each rod is binding. Degreasing the latch assembly can't hurt, but usually the grease is so dried out and petrified, anything short of removing the latch and soaking in solvent probably won't remove it. You can fill a plastic tub with odorless mineral spirits and drop in a typical thirdgen door latch, and an hour later the solvent will be black.