Mercedes-Benz S-Class Saloon W223 2021 Owner's Manual page 184

182 Climate control
Red: Heating mode is switched on.
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Yellow: the departure time is preselected.
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Stationary heater/ventilation
▌Stationary heater/ventilation function
The air inside the vehicle is heated or ventila-
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ted to the set temperature.
The air inside the vehicle cannot be cooled
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down to temperatures below the outside tem-
perature.
If the outside temperature changes, ventilation
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mode automatically switches to heating mode
or heating mode automatically switches to
ventilation mode.
The stationary heater and the exhaust gas outlet
are situated behind the right-hand front wheel.
▌Switching the stationary heater/ventilation
on/off via the operating unit
& DANGER Risk of fatal injury due to poison-
ous exhaust gases
If the tailpipe is blocked or sufficient ventila-
tion is not possible, poisonous exhaust gases
such as carbon monoxide may enter the vehi-
cle. This is the case in enclosed spaces or if
the vehicle gets stuck in snow, for example.
Always switch the stationary heater off in
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enclosed spaces without an air extrac-
tion systems, e.g. in garages.
Keep the tailpipe and the area around
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the vehicle free from snow when the
engine or the stationary heater are run-
ning.
Open a window on the windward side of
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the vehicle to ensure an adequate supply
of fresh air.
P223 0288 02
& WARNING Risk of fire due to hot station-
ary heater components and exhaust gases
Flammable materials such as leaves, grass or
twigs may ignite.
When the stationary heater is switched
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on, make sure that:
hot vehicle parts do not come into
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contact with flammable materials.
the exhaust gas can flow out of the
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stationary heater exhaust pipe unhin-
dered.
the exhaust gas does not come into
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contact with flammable materials.
* NOTE Battery discharge caused by sta-
tionary heater or stationary ventilation
operation
Operating the stationary heater or stationary
ventilation drains the battery.
After heating or ventilating the vehicle
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twice, drive for a longer period of time.