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Temperature selector wheel, location/task/design/function - GF83.25-P-2102GI

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

Fig 1: Identifying Temperature Selector Wheel - Model 163 As Of 1.9.01 With Code (580a) Automatic Air Conditioning
G04608918Courtesy of MERCEDES-BENZ USA
  Temperature selector wheel, location The temperature selector wheel (2) is located in the center in the AAC push-button control module (N22).  
  Temperature selector wheel, task The temperature selector wheel (2) serves to preselect the temperature desired in the vehicle interior.  
  Temperature selector wheel design The temperature selector wheel (2) is equipped with a rotary ring, with which the temperature values can be set. The LEDs in the rotary ring display the set temperature level.  
  Temperature selector wheel, function   GF83.25-P-2102-01GI