Mercedes-Benz S 320 CDI, Owner'S Manual

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354
Controls
Heater booster system*
The heater booster system helps the en-
gine to reach its operating temperature
more quickly after it is started, and helps
the interior to warm up more quickly.
The heater booster system switches itself
on if:
앫
the outside temperature is below 8 °C
앫
the coolant temperature is below
70 °C
i
The tank must be at least full to the reserve
fuel level to ensure that the heater booster sys-
tem can function.
Vehicles without auxiliary heating
1
To switch the heater booster system on
or off
2
Indicator lamp
Vehicles with auxiliary heating*
1
To switch the heater booster system on
or off
2
Indicator lamp
You can also switch on the heater booster
system manually to create a more comfort-
able temperature, e.g. at outside tempera-
tures above 9 °C.
왘
To switch on or off: make sure that
the engine is running.
왘
Push rocker switch
1
briefly up or
down.
Heater booster system*
G
Risk of fire and poisoning
Exhaust fumes are produced when the heat-
er booster system is in operation. You
should therefore switch off the heater
booster system in confined spaces without
an extraction system, e.g. in a garage.
Heater booster system operation is prohibit-
ed at filling stations or when your vehicle is
being refuelled. You must therefore switch
off the engine at filling stations.
P83.70-4813-31
Indicator
lamp
Heater booster system
on switched on
off switched off