Just in case you check this thread and, as a former ZJ owner, do a search in ZJ forum on AC leak. It is a common issue having to do with leaves plugging up the AC drain which stupidly drains into the frame rail and cannot be accessed. The fix involves drilling a quarter inch hole in the exact middle of the round section of the inside air box under the glove compartment. You can then either ream out with coat hanger or blow out with compressed air using small tubing. Been there done that. Good luck and thanks for the ZJ memories.