Most of the time years of paint or caulking the seams around the panels will cause the wood to stick and not allow the panel to expand and contract with the weather.
Repair broken paneled door.
No car is more fraught with busted plastic than the 4 th generation gm f body which is the 1993 to 2002 chevrolet camaro and pontiac firebird.
Once the broken panels slide use a hot glue gun to attach wooden blocks to both side edges of each of the panels.
Door panel repair with bondo bumper repair a common issue for any owner of mid 90s and newer cars is dealing with broken interior plastic.
If a crack has gunk in it clean out the space with a strip of sandpaper.