Mercedes-Benz GLB 2023 Operator's Manual page 147

Press the 0 button.
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The synchronization function will be deactivated if
the settings for one of the other climate zones are
changed.
Switching the synchronization function on/off via
the multimedia system
Multimedia system:
Climate Menu First Row of Seats
4 5
Climate control can be set centrally using the syn-
chronization function. The driver's settings for
temperature, air quantity and air distribution will
be adopted automatically for all climate zones.
Select SYNC and switch it on or off.
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Defrosting the windows
Windows fogged up on the inside
Press the à button.
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If the windows remain fogged up: press
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the ¬ button.
Windows fogged up on the outside
Switch on the windshield wipers.
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Press the à button.
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Switching air-recirculation mode on/off
Press the g button.
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The interior air will be recirculated.
Air-recirculation mode automatically switches to
fresh air mode after a while.
% If air-recirculation mode is switched on, the
windows may fog up more quickly. Switch on
air-recirculation mode only briefly.
Switching the residual heat on/off (Canada)
Requirements:
The vehicle is parked.
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%
Only vehicles with a diesel engine can use
residual heat.
It is possible to make use of the residual heat
from the engine to continue heating or ventilating
the front compartment of the vehicle for approx-
Climate control 145
imately 30 minutes, depending on the tempera-
ture set.
To activate: press the Á button.
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Residual heat will be switched off automatically.
Air vents
▌Adjusting the front air vents
& WARNING Risk of burns or frostbite due to
being too close to the air vents
Very hot or very cold air can flow from the air
vents.
Make sure that all vehicle occupants
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always maintain a sufficient distance
from the air vents.
If necessary, direct the airflow to another
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area of the vehicle interior.
To guarantee the flow of fresh air through the air
vents into the vehicle interior, note the following:
Always keep the vents and ventilation grilles in
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the vehicle interior clear.