Mercedes-Benz S-Sedan 2015 Owners Manual - Manual (Page 167)

Problems with the rear window defroster
Problem Possible causes/consequences and M M Solutions
The rear window
defroster has deacti-
vated prematurely or
cannot be activated.
The battery has not been sufficiently charged.
X
Switch off any consumers that are not required, e.g. reading
lamps, interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window
defroster can be activated again.
Activating/deactivating air-recircula-
tion mode
General notes
You can also temporarily deactivate the flow
of fresh air manually if unpleasant odors are
entering the vehicle from outside. The air
already inside the vehicle will then be recir-
culated.
If you switch on air-recirculation mode, the
windows can fog up more quickly, in particu-
lar at low temperatures. Only use air-recircu-
lation mode briefly to prevent the windows
from fogging up.
Activating/deactivating
X Turn the SmartKey to position 2 in the igni-
tion lock (
Y
page 173).
X
To activate: press the g rocker switch
up or down.
The indicator lamp in the g rocker
switch lights up.
Air-recirculation mode is automatically acti-
vated at high levels of pollution or at high out-
side temperatures. The indicator lamp in the
g rocker switch is not lit when automatic
air-recirculation mode is activated. Outside
air is added after about 30 minutes.
X
To deactivate: press the g rocker
switch up or down.
The indicator lamp in the g rocker
switch goes out.
Air-recirculation mode deactivates automati-
cally:
R
after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †)
R after approximately five minutes if cooling
with air dehumidification is deactivated
R
after approximately 30 minutes at outside
temperatures above approximately 41 ‡
(5 †) if the "Cooling with air dehumidifica-
tion" function is activated
Activating/deactivating the residual
heat function
General notes
Vehicles with rear-compartment climate
control: once the engine is switched off, it is
possible to make use of the residual heat of
the engine to continue heating or ventilating
the rear and front compartment of the vehicle
for approximately 15 minutes. If the "Residual
heat" function is set for only the front or only
the rear compartment, it is possible to con-
tinue heating or ventilating for approximately
30 minutes.
Vehicles without rear-compartment cli-
mate control: once the engine is switched
off, it is possible to make use of the residual
heat of the engine to continue heating or ven-
tilating the front compartment of the vehicle
for approximately 30 minutes.
The heating or ventilation time depends on
the temperature that has been set.
Operating the climate control systems
165
Climate
control