Has anyone experienced with these TJ'S of direction heat or ac being changed while driving over the speed of say 60 mph? What was the problem or cause of this? Mine changes randomly from defroster, dash & floor from what it is set at on dash.
Thank you sounds like the place to start with this problemSounds like a vacuum leak. With loss of vacuum, airflow defaults to defrost vents. Do remember reading about similar problems. Check vacuum line where it passes through firewall, connections at engine and also at vacuum canister (believe it's below battery).