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Maintenance and careD Before the engine is next put into operation (with the engine cold) check the coolantlevel and top up if necessaryD Repeat this procedure until no more coolant can be addedNote:The turbochargers must not be bled while the cooling system is being topped up.Danger:If, in an exceptional case, the coolant level has to be checked in an engine thathas reached operating temperature, first carefully turn the cap À (large cap) withsafety valve to the first stop, let off pressure, then open carefully.Note:Don’t open the cooling system when the engine is at operating temperature.This causes a pressure loss in the cooling system.If the cooling system has been opened when the engine is at operating temperaturethis can lead to the alarm “pressure in the expansion tank” when the engineis then put into operation and to a reduction in the engine output.Coolant pressure in the expansion tank is only built up again when the enginehas cooled down. The cooling system must therefore only be filled up when theengine is cold.58