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Auto button, function - GF83.40-P-2106-01R

Fig 1: Identifying Auto Button, Function
G05076613Courtesy of MERCEDES-BENZ OF NORTH AMERICA.

Function with automatic air conditioning (AAC) 

Pressing the Auto button (AUTO BUTTON ) of the air distribution switches, (3, 4) enables the automatic mode to be activated for the left and right hand sides. Afterwards, by pressing the air distribution switches (3, 4) manual mode can be returned to.

As well as controlling the temperature, the blower output (switch pressed) and the air distribution can all be automatically regulated in automatic mode. If the blower switch is (5) not pressed then the blower can be manually  regulated.

The blower speed is continuously controlled depending on the temperature difference between the specified and actual values. The electronic control of the system not only uses the interior temperature (in-car temperature sensor), but also the air humidity (AAC multifunction sensor).