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Hi, welcome to Just Answer. My name is***** problem would be caused by a fault with the right side center vent blend flap stepper motor. The car should be connected to the Mercedes Star Diagnosis tester to check for faults with all of the stepper motors and to perform the synchronization procedure for the motors. Sometimes the synchronization procedure will get the flap working properly but what typically happens is the stepper motor will fail and will need to be replaced. The system uses electric motors to move all of the flaps to the requested position. The blend flap stepper motor blends warm air with cold air for the center vents. There is a separate motor for the left and right center vents.
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