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Center nozzle vent air temperature sensor, location/task/function - GF83.57-P-2116GI

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

Fig 1: Identifying Center Nozzle Vent Air Temperature Sensor
G04608995Courtesy of MERCEDES-BENZ USA
  Center nozzle vent air temperature sensor, location The center nozzle vent air temperature sensor (B10/24) is located to the left of the air duct's center nozzle below the instrument panel.  
  Center nozzle vent air temperature sensor, task The center nozzle vent air temperature sensor (B10/24) records the temperature of the air flowing out of the center nozzle and sends it to the AAC push-button control module (N22).  
  Center nozzle vent air temperature sensor, function The vent air's recorded temperature value is compared by the AAC push-button control module (N22) with the setting in the temperature selector wheel whereupon it authorizes a corresponding adjustment to the blending air flap to be made depending upon the result.