I can't get my door open - '83 civilian Gran Fury. When I pull on the door handles, both inside and out, nothing happens. Door is unlocked. How can I fix it??? Pass side rear door. I have sprayed the inside with WD-40, pounded on it from both inside and out, cycled the lock and cursed at it with no luck. Getting pretty frustrated. I don't see any way to remove the door panel either without opening the door first.

pull the back seat out then you should have room to pull the inside door panel

Back seat's already out
There seem to be some screws on the panel that are inaccessible with the door shut

Or, there are hidden screws or arm rests, handles that need to come off first. If you can get at least part of the panel loose, maybe you can see inside and/or reach a hand inside to manipulate and release the mechanism.

It could be that the mechanism or rods and clips have come apart not allowing the inner and outer handles to actuate/release.

On the '74 W200 Power Wagon I bought last November, I had to lift up on the driver door itself, as well as the release button, to get it to release, it was that way when I bought it.

Turned out all I needed to do to "Fix" it, was to use a Hex (Allen) Wrench through the adjuster hole opening in the sheet metal of the inner door, just beneath the mechanism. Adjustment was all that was required.

Yours could be a similar issue, or the rod retention clips may have popped off or failed, or the mechanism itself is seized or broken.

Try lowering the door glass. You may be able to see the latch & check what may not be working properly. Sometimes a properly placed long screw driver pushing done the release mechanism works if accessible this way.
[If you are not familiar with what releases the latch, you may need to take the opposite side trim panel off to see how things work.]
-Lou

I've opened stuck doors by unbending a wire coat hanger and using it manipulate the lock rods through the window opening with the glass down.

http://www.dippy.org/forum2/index.php/topic,1122.0.html

Should be the same for you

All the screws should be accessible with the door shut and seats out of the way. But the panel is probably a PITA to get off.

Forgot about the armrest screws. Thanks Moparts!!