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304 Driving mode
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You can have the fitting for the coolant pre‐
heater retrofitted at a qualified specialist
workshop.
Before attempting a cold start
* NOTE Damage to the batteries due to
rapid charging
In extremely low temperatures, the battery
fluid of discharged batteries can freeze.
Do not perform rapid charging on cold
#
batteries as the batteries may otherwise
be damaged.
Special measures must be taken before a cold
start if the vehicle has been exposed to extremely
low temperatures:
Charge discharged batteries before starting.
#
%
The capacity of the batteries is adversely
affected by increasingly cold temperatures.
Thaw frozen batteries before charging them.
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Starting the engine at low temperatures
* NOTE Damage to the batteries during a
cold start
A starting attempt when a battery is cold or
not fully charged can result in damage to bat‐
teries.
If you notice a low battery voltage or the
#
# symbol is displayed in an event
window when you switch on the ignition,
do not start the engine.
* NOTE Damage to the engine
If a warning tone sounds and the 5 sym‐
bol appears in a red event window in the on-
board computer, the operating safety of the
engine is jeopardised.
Do not set the vehicle in motion, or park
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it up immediately, paying attention to
the road and traffic conditions.
Switch off all electrical consumers, e.g. radio,
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blower.
In outside temperatures below -20°C and
#
vehicles with auxiliary heating (auxiliary heat‐
ing for cab and engine, 9 kW): preheat the
engine using the auxiliary heating before
starting it (
page 110).
/
In outside temperatures below -30°C and
#
vehicles with a coolant preheater: preheat the
engine with the coolant preheater for at least
90 minutes.
Switch on the ignition.
#
Pay attention to the outside temperature
#
shown on the display (
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that the on-board electrical system voltage is
low, e.g. weak lighting system.
Shift the transmission to the neutral position.
#
Deactivate the power take-off (
#
Start the engine.
#
To start the engine more easily, the clutch will
automatically be disengaged from -5°C when
the engine is started in vehicles with an auto‐
matic transmission.
Once the engine has started, release the
#
start/stop button.
The idle speed will be regulated automatically.
If the engine does not start:
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The starting procedure is automatically inter‐
rupted for the following vehicles:
with the OM 936 engine after around 60
R
seconds
with the OM 470, OM 471 and OM 473
R
engines after around 40 seconds
Switch the ignition off.
#
Repeat the starting procedure after approx‐
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imately one minute.
After three starting procedures, take a break
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of about three minutes.
If the supply pressure in the brake system has
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fallen below 6 bar, fill up the compressed-air
system (
page 363). This will ensure that
/
the clutch is disengaged when you start the
engine in vehicles with an automatic trans‐
mission.
Driving in low temperatures
Observe the following in outside temperatures
below -20°C:
Check the supply pressure in the brake sys‐
R
tem before you set off.
Set off only when the supply pressure is suffi‐
cient.
Before you set off, ensure that the steering is
R
sufficiently warm. Only then will it be ensured
that the steering can function properly.
page 119) and signs
page 307).
/
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