Maintenance and Service
Diesel engine
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7.1.4.3 Replacing coolant
Use only corrosion protection/antifreeze agents approved by Mercedes-Benz. The
coolant must be exchanged every three years. In any case, comply with the regionally
applicable regulations on environmentally compatible disposal of coolant.
1
(1) Drain valve for coolant at cooling water pipe
Before renewal of coolant, check the cooling and heating system for leaks and condi-
tion.
The drain valve is on the coolant pipe (see picture).
– Slowly open the filler cap at the expansion tank of engine cooling system, relieve
excess pressure, then take off the cap.
– Screw on drain hose on the drain valve.
– Drain coolant and catch coolant in a suitable vessel.
– Close drain valve again.
– Fill in coolant in the prescribed combination up to the lower edge of the filling neck
and close the cover lid.
– Set the desired temperature for the air conditioning system to the maximum tem-
perature, so that the control valve for the heating system is opened.
– Switch on the hydraulic oil tank heater (lever up).
– If your machine is fitted with park heating, switch it on.
– Start diesel engine and let it run for about 1 minute at differing rotational speeds.
– Check the coolant level and, in case of need, fill up coolant.
– Have replacement of coolant confirmed in service documentation.
Specified coolant types: corrosion/antifreeze -40°
MB standard 325.5 and 326.5
Filling volume: approx. 25-30 litres
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