Maintenance and Service
Diesel engine
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Compensation tank for coolant
WARNUNG
Burning hazard!
As long as the engine is warm, the cooling system is under pressure. There is a burn-
ing (scalding) hazard from emitting steam or spraying hot coolant!
– Wear protective gloves and protective goggles.
– Open the filler cap (1) 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 (1) of the expansion
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 less antifreeze is indicated, then
correct the mixture ratio.
If the concentration is too low, there is the hazard of damage to the engine due to cor-
rosion/cavitation in the cooling system!
Avoid concentrations of more than 55 vol.-% corrosion protection/antifreeze agents,
because otherwise the maximum frost protection of up to -45°C is not achieved. The
cooling 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 452 and
page 322).
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