The instructions on this older thread have links to pictures that do not exist anymore, so it is harder to follow. I also cannot tell if the instructions are for a 92-96 style, or a 1989 style.
I basically need to clean out whatever might be restricting airflow inside the cabin, and I'm guessing it is clogged evaporator core fins or heater core fins. Just need to figure out how to get in there and clean it.
http://www.automotiveforums.com/vbul...36#post5764636