It is warming up so this is becoming more important. I have found a few YouTube videos with a variety of "fixes". One guy removed his glove box and blower motor and reached up to remove a broken door. Afterwards he showed a great improvement in airflow. I wonder though if the door was blocking flow from the drivers side and just redirecting it to the right. I don't have any "Dual Zone" function that I know of. There are no left/right options, just icons depicting arrows to the head, the feet, a recirculating icon and a defroster position. I suppose that I can just start taking stuff apart and hope that I find something obvious. I learned about engines by taking them apart and putting them back together...