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Air distribution switch, location/task/design/function - GF83.25-P-2101GI

MODEL 163 as of 1.9.01 with code (580a) Automatic air conditioning 

Fig 1: Identifying Air Distribution Switch - Model 163 As Of 1.9.01 With Code (580a) Automatic Air Conditioning
G04608916Courtesy of MERCEDES-BENZ USA
  Air distribution switch, location The air distribution switch (3) is located on the right in the AAC push-button control module (N22).  
  Air distribution switch, task The air distribution switch (3) controls the air flow to the air outlets for ventilation of the passenger compartment.  
  Air distribution switch, design The air distribution switch (3) is equipped with a rotary ring, with which the air distribution can be set. The LEDs in the rotary ring display the air distribution level.  
  Air distribution switch, function   GF83.25-P-2101-01GI