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AC OFF button, location/task/function - GF83.40-P-2107GI

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

Fig 1: Identifying Temperature Thumbwheel And AC OFF Button
G04608947AC OFF BUTTONAC OFF BUTTONCourtesy of MERCEDES-BENZ USA
  AC OFF button, location The AC OFF button (AC OFF BUTTON ) is located at the center of the lower half of the temperature selector wheel (2) on the AAC push-button control module (N22).  
  AC OFF button, task The AC OFF button (AC OFF BUTTON ) serves to switch the automatic air conditioning on and off. Function feedback is by way of a red LED.  
  AC OFF button, function   GF83.40-P-2107-01GI