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Rear air stream temperature sensor, location/task/function - GF83.57-P-2118GI

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

Fig 1: Identifying Rear Air Stream Temperature Sensor
G04608997Courtesy of MERCEDES-BENZ USA
  Rear air stream temperature sensor, location The rear air stream temperature sensor (B10/7) is located to the left of the rear passenger compartment blower motor housing behind the rear nozzle.  
  Rear air stream temperature sensor, task The rear air stream temperature sensor (B10/7) records the temperature of the air flowing in the rear passenger compartment and sends it to the AAC push-button control module (N22).  
  Rear air stream temperature sensor, function The recorded temperature value for the rear ventilation air stream is compared by the AAC push-button control module (N22) with the setting in the temperature selector wheel and authorizes a corresponding adjustment to the blending air flap to be made depending upon the result.