How to stop super heated air from coming from ac vent on driver side. on 1995 Mercedes-Benz S500

Heated air is coming from driver side vent when ac is on for the rest of the car. When I close left driver vent, hot air begins to come from driver side center vent. closing that vent hot air moves to passenger side vents. Climate control is not balancing heating and cooling.

Asked by for the 1995 Mercedes-Benz S500