Mercedes-Benz CLA-Class 2015 - Manual (Page 137)

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.
Activating/deactivating air-recircula-
tion mode
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.
The operation of air-recirculation mode is the
same for all control panels.
Switching on/off
X Turn the SmartKey to position 2 in the igni-
tion lock (
Y
page 141).
X
To activate: press the e button.
The indicator lamp in the e button lights
up.
Air-recirculation mode switches on automat-
ically:
R at high outside temperatures
R
at high levels of pollution
When air-recirculation mode is activated
automatically, the indicator lamp in the e
button is not lit. Outside air is added after
about 30 minutes.
X
To deactivate: press the e button.
The indicator lamp in the e button goes
out.
i Air-recirculation mode deactivates auto-
matically:
R
after approximately five minutes at out-
side temperatures below approximately
45 ‡ (7 †)
R after approximately five minutes if the
"Cooling with air dehumidification" func-
tion is deactivated
R after approximately 30 minutes at out-
side temperatures above approximately
45 ‡ (7 †) if the cooling with air dehu-
midification function is activated
Activating/deactivating the residual
heat function
General notes
The residual heat function is only available in
vehicles for Canada with dual-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.
i The blower will run at a low speed regard-
less 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.
Operating the climate control systems
135
Climate
control