Hey there I need help. I have a 2002 Ford Explorer. I just replaced my air compressor and had it charged. My daughter drive this car to college. The mechanic called and said that the air only blows out of the defrost and not the dash vents. He called it the heater blend door, first I don't think its that. The mode selector switch that you can direct the air is what I think is not working. Can it be the heater blend door that is not letting air come out of the dash vents. Please help.