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Blower switch, location/task/design/function - GF83.25-P-2100GI

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

Fig 1: Identifying Blower Switch - Model 163 As Of 1.9.01 With Code (580a Automatic Air Conditioning
G04608914Courtesy of MERCEDES-BENZ USA
  Blower switch, location The blower switch (1) is located on left in the AAC push-button control module (N22).  
  Blower switch, task The blower switch (1) activates several blower stages in fresh air and recirculating air mode.  
  Blower switch design The blower switch (1) is equipped with a rotary ring with which the blower levels can be set. The LEDs in the rotary ring display the set blower level.  
  Blower switch, function The blower switch (1) sets the control voltage for the blower regulator in 6 stages and 5 intermediate settings via the push-button control module, depending on the setting. This facilitates blower speed control of 0 -100 %.