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Problems with the rear window defroster
Problem
Possible causes/consequences and MM Solutions
The rear window
defroster has deactiva-
ted prematurely or can-
not 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.
Switching air-recirculation mode
on/off
General notes
You can deactivate the flow of fresh air if
unpleasant odors are entering the vehicle from
outside. The air already inside the vehicle will
then be recirculated.
If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Activating/deactivating
X
Turn the SmartKey to position 2 in the igni-
tion lock (Y page 140).
X
To activate: press the d button.
The indicator lamp in the d button lights
up.
i
In the event of high pollution levels (3-zone
automatic climate control only) or at high out-
side temperatures, air-recirculation mode is
automatically activated. When air-recircula-
tion mode is activated automatically, the indi-
cator lamp in the d button is not lit.
Outside air is added after about 30 minutes.
X
To deactivate: press the d button.
The indicator lamp in the d button goes
out.
i Air-recirculation mode deactivates auto-
matically:
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 dehumidifi-
cation" function is activated
Switching the residual heat on or off
General notes
The residual heat function is only available on
vehicles for Canada.
It is possible to make use of the residual heat of
the engine to continue heating the stationary
vehicle for up to 30 minutes after the engine has
been switched off. The heating time depends on
the set interior temperature.
Activating/deactivating
X
To activate: press the Ì or Á button.
The indicator lamp in the Ì or Á button
lights up.
i
The blower will run at a low speed regardless
of the airflow setting.
i
If you activate the residual heat function at
high temperatures, only the ventilation will be
activated. The blower runs at medium speed.
X
To deactivate: press the Ì or Á but-
ton.
The indicator lamp in the Ì or Á button
goes out.
Residual heat is deactivated automatically:
R
after approximately 30 minutes
R
when the ignition is switched on
R
if the battery voltage drops
Ionization
Ionization is used to purify the air in the vehicle
interior and attain an improved interior climate.
Operating the climate control systems
135
Climate control
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