2016 MS A/C Question. When I first get in the car it blows just fine. After the system is on for a long time (2 hours?) it is still blowing cold air but it is barely coming out of the vents. The front louvres (at the bottom of the front bumper) are open so I know it isn't getting blocked there. New cabin filter. What could be the culprit to stop the flow of air after a long period of time? I know in Home AC systems, if you have low refrigerant it can sometimes freeze up the coils because it is working too hard and that causes the air flow to drop. Could that be happening here too?