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Blower button position/task/function - GF83.40-P-2144GI

MODEL 163 as of 01.09 01 with CODE (580a) Automatic air conditioning in the rear ventilation control panel 

Fig 1: Identifying Blower Button
G04608957BLOWER BUTTONBLOWER BUTTONCourtesy of MERCEDES-BENZ USA
  Blower button, location The blower button (BLOWER BUTTON ) is located in the center in the rear ventilation control panel.  
  Blower button, task The blower button (BLOWER BUTTON ) is used to cut in the blower motor for fresh air and recirculating air operation.  
  Blower button, function   GF83.40-P-2100-01GI