OPM 320 en-GB
35
©
Scania CV AB 2019, Sweden
Cooling system
Risk of freezing
IMPORTANT!
The engine should not be subjected to heavy
loads if ice starts to form in the cooling system.
If the coolant starts to freeze, the water in the
coolant starts to crystallise and the ethylene gly-
col content in the coolant increases. If freezing
produces a great increase in the amount of ice,
circulation problems could arise. There is no risk
of damage by freezing if the content of Scania
antifreeze and corrosion inhibitor, or an equiva-
lent mixture of a similar product, is at least 35%
by volume.
Minimal ice formation in the coolant sometimes
causes minor problems without any risk of dam-
age. For example, the auxiliary heater may not
work for up to one hour after the engine has been
started.
The chart depicts coolant properties at different
percents of antifreeze and corrosion inhibitor
concentration by volume.
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.
Example: If the temperature is -16 C (3°F), there
is a risk of damage by freezing if the percentage
of antifreeze and corrosion inhibitor is 20% by
volume. At 30% antifreeze and corrosion protec-
tion by volume the coolant will not contain any
ice.
Curve A: Ice formation starts (ice slush)
Curve B: Damage by freezing
Area 1: Safe area
Area 2: Malfunctions may occur (ice
slush)
Area 3: Risk of damage by freezing
10
20
30
40
50 60%
o
C
o
C
o
C
o
C
o
C
o
C
o
C
-10
-20
-30
-40
-50
-60
-16
3
2
1
A
B
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