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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 also temporarily deactivate the flow of
fresh air manually if unpleasant odors are enter-
ing 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 131).
X
To activate: press the g rocker switch up
or down.
The indicator lamp above the g rocker
switch lights up.
Air-recirculation mode switches on automati-
cally:
R
at high outside temperatures
R
at high levels of pollution (3-zone automatic
climate control only)
R
in a tunnel (vehicles with a navigation system
only)
The indicator lamp above 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 above 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 dehumidification"
function is activated
Switching the residual heat on or off
General notes
The residual heat function is only available with
3-zone automatic 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 front com-
partment of the vehicle for approximately
30 minutes. The heating or ventilation time
depends on the interior temperature that has
been set.
Activating/deactivating
X
Turn the SmartKey to position u in the igni-
tion lock or remove it (Y page 131).
X
To activate: press the ! rocker switch up
or down.
The indicator lamp above the ! rocker
switch lights up.
The blower will run at a low speed regardless of
the airflow setting.
If you activate the residual heat function at high
temperatures, only the ventilation will be acti-
vated. The blower runs at medium speed.
126
Operating the climate control systems
Climate control
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