Problems with the rear window defroster
Problem
Possible causes/consequences and
M
M
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 vehi-
cle will then be recirculated.
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 149).
X
To activate: press the
g
button.
The indicator lamp in the
g
button lights
up.
i
Dual-zone automatic climate control: air-
recirculation mode is automatically activa-
ted at high outside temperatures.
3-zone automatic climate control: air-recir-
culation mode is automatically activated at
high levels of pollution or at high outside
temperatures.
When air-recirculation mode is activated
automatically, the indicator lamp above the
g
button does not light up. Outside air is
added after about 30 minutes.
X
To deactivate: press the
g
button.
The indicator lamp in the
g
button goes
out.
i
Air-recirculation mode deactivates auto-
matically:
R
after approximately five minutes at out-
side temperatures below approximately
41 ‡ (5 †)
R
after approximately five minutes if cool-
ing with air dehumidification is deactiva-
ted
R
after approximately 30 minutes at out-
side temperatures above approximately
41 ‡ (5 †) if the "Cooling with air dehu-
midification" 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.
It is possible to make use of the residual heat
of the engine to continue heating the vehicle
for approximately 30 minutes after the engine
has been switched off. The heating time
depends on the set interior temperature.
Activating/deactivating
X
Turn the key to position 0 in the ignition
lock or remove it (
Y
page 149).
X
To activate: press the
Ì
button.
The indicator lamp in the
Ì
button lights
up.
i
If the residual heat function is activated,
the windows may fog up on the inside.
144
Operating the climate control systems
Climate
control
