Hot-water auxiliary heater
General notes
!
Operating the hot-water auxiliary heater
draws from the vehicle battery. For this rea-
son, drive for a longer distance after using the
heater or ventilating the vehicle twice, at the
latest.
Always observe the important safety instruc-
tions when operating the auxiliary heating
(
Y
page 144)
The hot-water auxiliary heater complements the
climate control system of your vehicle and has a
heater booster function, an auxiliary heating
function and an auxiliary ventilation function. In
addition, the auxiliary heating system heats the
engine coolant to preserve the engine and save
fuel during the warming-up phase.
The auxiliary heating heats the air in the vehicle
interior to the set temperature. This occurs with-
out using the heat of the running engine. The
auxiliary heating is operated directly using the
vehicle's fuel. For this reason, the tank content
must be at least at reserve fuel level to ensure
that the auxiliary heating functions.
The auxiliary heating automatically adjusts to
changes in outside temperature and weather
conditions. For this reason, the auxiliary heating
could switch from ventilation mode to heating
mode or from heating mode to ventilation mode.
The auxiliary ventilation is not active if the
engine is running.
The auxiliary heating system switches off auto-
matically after a maximum of 50 minutes.
You cannot use the auxiliary ventilation to cool
the vehicle interior to a temperature lower than
the outside temperature.
The heater booster function supports the cli-
mate control system when the engine is running
and the outside temperature is low.
Before switching on
X
Turn the key to position
2 in the ignition lock.
Vehicles with heating
X
Turn the temperature control to the
z
maximum position.
Vehicles with TEMPMATIC air conditioning sys-
tem or THERMOTRONIC automatic climate con-
trol
X
Set the desired temperature
If you do not alter the temperature before
switching on the auxiliary heating, the last
temperature setting will be adopted.
The auxiliary heating can also be switched on
if the manually set climate control is activa-
ted. Optimum comfort can be attained when
the system is set to automatic mode. Set the
temperature to 22 †.
You can activate or deactivate the auxiliary heat-
ing:
R
using the
&
rocker switch on the centre
console (
Y
page 145)
R
using the on-board computer (
Y
page 147)
R
using the remote control (
Y
page 146)
You can use the on-board computer or the
remote control to specify up to three departure
times, one of which may be preselected.
Switching the auxiliary heating on/off
via the buttons on the centre console
The coloured Indicator lamps in the
&
button
have the following meanings:
Blue
Auxiliary ventilation switched on
Red
Auxiliary heating switched on
Yellow Departure time preselected
X
Press the
&
button.
If the red or blue indicator lamp in the
&
button lights up, the auxiliary heating is acti-
vated.
If you switch on the auxiliary heating while the
engine is running, you activate the heater boos-
ter function of the auxiliary heating. The heater
booster function then supports the climate con-
Operating the auxiliary heating system
145
Climate control
Z
