The coolant should be changed when the cooling
system is cleaned: every 6,000 hours or at least
every 5 years. See the section Changing the cool-
ant and cleaning the cooling system.
The coolant has several characteristics which are
important for the operation of the cooling sys-
tem:
• Corrosion inhibitor.
• Antifreeze.
• Increases the boiling point.
Scania recommends that the coolant used is a
mixture of water with antifreeze and corrosion
inhibitor (ethylene glycol). The coolant should
always contain 35-55% by volume of antifreeze
and corrosion inhibitor so that the coolant has the
correct properties for the cooling system to work.
Coolant resistance to cold
The following example shows coolant properties
with 30 percent by volume of antifreeze and cor-
rosion inhibitor:
• Ice slush starts to form at -16°C (3°F).
• At -30°C (-22°F), there is a risk of cooling
system malfunction.
• There is no risk of damage by freezing with a
minimum antifreeze and corrosion inhibitor
content of 35 percent by volume.
The chart depicts coolant properties at different
percents of antifreeze and corrosion inhibitor
concentration by volume.
Curve A: Ice formation starts (ice slush)
Curve B: Damage by freezing occurs
Area 1: Safe area
Area 2: Malfunctions may occur (ice
slush)
Area 3: Risk of damage by freezing
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