Maintenance and Service
Diesel engine
7.1.5.2 Coolant check
If the liquid level in the expansion tank (10) seems too low, the following warning icon
is displayed on R-Touch: . The cooling-water expansion tank is located in front of
the intake grid. It is easily accessible from the boarding platform.
Compensation tank for coolant
(10) Expansion tank for coolant
(11) Coolant filler cap
WARNING
Burning hazard!
As long as the diesel engine is warm, the cooling system is under pressure. There is
a burning (scalding) hazard from emitting steam or spraying hot coolant!
– Wear protective gloves and protective goggles.
– Open the filler cap (11) of the expansion tank only when the engine has cooled off.
Open the filler cap always very carefully.
Only check the coolant level at a coolant temperature of below 50°C.
Before correcting the coolant level, check corrosion protection/antifreeze.
To check the coolant level, slowly and carefully open the filler cap (11) of the expan-
sion tank. Slowly relieve possible excess pressure.
Check corrosion protection/antifreeze using a testing device.
The correct component of 50 vol.-% corrosion protection/antifreeze agents in the
coolant is warranted if it is frost-proof up to -37°C. If the desired antifreeze effect is not
achieved, correct the mixture ratio.
If the concentration is too low, there is a hazard of damage to the engine due to corro-
sion/cavitation in the cooling system!
Avoid concentrations of more than 55 vol.-% corrosion protection/antifreeze agents,
otherwise the maximum frost protection of up to -45°C can not be achieved. The cool-
ing system is correctly filled if the coolant reaches to the lower edge of the filler neck.
Only use prepared coolant with 50 vol.-% corrosion protection/antifreeze agents that
has been expressly approved by Mercedes-Benz for refilling. (See Page 516 und
Page 364)
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