Ventilation
Set the air supply regulator to position 3 or 4. Set the supply air temperature regulator to the blue mark (heating off). Set the air flow direction switch to position
.
Turn on the air recirculation mode. Set the air direction from the deflectors as desired.
To ventilate the rear of the passenger compartment, open the upper center deflector.
Heating
Set the air supply regulator as desired. Set the supply air temperature regulator as desired. Set the air flow direction switch to position
to 
.
Turn on the air recirculation mode. Set the air direction from the deflectors as desired. For optimum heating of the rear passenger compartment, set the air flow direction switch to position
.
Defogging and defrosting glass
Set the air supply regulator to position 3 or 4. Set the temperature regulator to the red mark. Set the air flow direction switch to position
. Turn off the air recirculation mode. Open the side deflectors as needed and set them to ventilate the side windows. Close the middle deflectors. Turn on the rear window heating. To quickly remove fog and defrost the windshield, close the side deflectors.
If the Tempmatic/Heatmatic system is present: set the temperature regulator to the MAX position.
Cooling (for cars with air conditioning)
Set the air supply regulator to a position between 1 and 4.
Set the temperature controller to the desired air temperature in the cabin. Set the air flow direction switch to position
.
Turn on the air conditioner. Open the deflectors as needed. For the rear of the cabin, open the middle deflector.
Air drying (for cars with air conditioning)
Set the air supply regulator to position 3 or 4. Set the temperature regulator to the desired air temperature in the cabin. Set the air flow direction switch to position
.
Turn on the air conditioner. Open the side deflectors as needed.
(Original article is on the portal MERCEDESMAN.ru)