1 – Temperature control knob on the left side.
2 – Temperature control knob on the right side.
3 – Air flow rate switch.
4 – Air flow distribution switch (12 positions).
5 – Handle for smooth adjustment of the amount of fresh air supplied to the vehicle interior.
6 – Movable nozzles for supplying fresh air into the vehicle interior.
7 – Handle for adjusting the amount of air supplied to the vehicle interior by the left or right nozzle of the ventilation system. To open the nozzle, turn the handle upwards.
8 – Movable nozzles for supplying air to the vehicle interior.
Fresh air is supplied to the vehicle interior through openings located in front of the vehicle's windshield, and air is removed from the vehicle interior when the windows are closed through ventilation openings.
9 – Air conditioning control buttons.
Buttons
and 
not pressed – cooling mode is normal.
To turn on the mode, you need to press the button, and the control lamp on the pressed button will light up.
To turn off, press the pressed button again, the indicator lamp will go out.
Long-term work.
When you press the button
the humidity in the car interior is reduced. At the same time, fogging of the windows is quickly eliminated.
Normal mode.
(Information copied from the website: MERCEDESMAN.ru)
When you press the button
both heated and cooled air can be supplied to the car interior. If the temperature in the car interior is high, only the air conditioner operates.
To set the recommended temperature of 22°C, both temperature control knobs must be set to the required position.
Instructions
If the temperature in the vehicle interior is not adjustable, set the temperature control knobs to the MIN or MAX position.
MIN – heating is off.
MAX – heating on.
Economy mode.
Economy mode corresponds to normal operation, but does not cool the air (fuel economy).
Recirculation.
Instructions
In normal cooling mode, the indicator light in the button lights up
and the button does not light up . If the indicator light in the button lights up 
, the cooling mode is turned off.
The air conditioning system only operates when the engine is running. As the engine speed increases, the air conditioning compressor also increases speed and increases cooling.
When the air conditioner is running, set the air flow switch 3 to at least position 1.
To increase the cooling intensity, set the air flow switch to a higher level. Clear the air intake grille in front of the windshield from snow. Do not block the air bleed holes located in front of the rear window.
Condensed water may appear on the bottom of the vehicle when the air conditioner is running.
When the air conditioner is turned on, the heating of the car interior is automatically adjusted. The temperature in the car interior is maintained at the level set by the temperature control knobs 1 and 2.
Air distribution in the car's interior can be accomplished by turning the air distributor handle 4 and changing the direction of the air flow from nozzles 6 and 8. Handles 5 and 7 change the air flow. Only fresh, unheated air comes from the central nozzles 6.
Rapid air cooling
Set temperature control knobs 1 and 2 to a position corresponding to a temperature no higher than 22°C.
Press the buttons
and 
.
Turn the air flow switch 3 all the way to the right.
Set the air flow distribution switch 4 to symbol 7.
Turn handles 5 and 7 upwards until they stop.
Close the side windows and sunroof completely.
Fogging on the outside of the windshield
In damp weather, the windshield may fog up from the outside. To eliminate fogging, turn the air flow distribution knob 4 to a position where cool air is blown onto the windshield.