Hi all,
I've looked everywhere for answers. Keep getting blend door as an answer.
My 97 GP was blowing air from all vents at the same time. After getting up under the dash and seeing that there are vacuum controlled diaphragms under there, I found the problem. Under the right side fuel rail is a vacuum line that goes to the brake master. Underneath the fuel rail is an accessory line that runs over and under the "relay control center". I found a broken plastic part that connects a couple of vacuum lines. I pulled the broken piece out of the line and stuck the line back on to the plastic junction part. Everything works great now.
Hope this helps someone else.
Randy
