Originally Posted By moparx
hot air, even if it's only one one side, indicates the core is ok. look at a blend door being broken or a blend door motor not working. very good possibility that was the original issue if you had heat in one position and not others.
beer



This is correct. Libertys are known for blend door issues. I believe specifically its that the door hinges on plastic pegs that just don't last but I am not positive on that.

Google the kj jeep forum and they discuss it at length.