Cadillac Repair: Defrost heat/air flow, cadillac deville, blower motor

Question
Recently when I turn my defrost on I have cold air and less air flow from the drivers side defrost than the much warmmer and more airflow passenger side, I have look behind the glove box and the control arm seems to move very well and over several inches of travel. I have a 93 cadillac deville with the 4.9liter blower motor seems to be working very well must be a blockage or blender door but I cant see anything that connects the drivers side to the passenger side for the air to flow through? any ideas thanx in advaced Steve

Answer
there are 2 air mix actuators, One for the drivers side and one for the passengers side. Since they are buried behind the instrument panel and will require removal of the complete dash assembly to get to them, You need to find someone who has a scanner capable of manipulating these actuators to see which one is at fault BEFORE you tear the dash apart.