OPM 100 en-GB 69
© Scania CV AB 2023, Sweden
Cooling system
Topping up
Coolant must only be topped up with pre-mixed
coolant. The pre-mixed coolant can either be
concentrate mixed with clean freshwater or pre-
mixed coolant from the factory. Use only pure
fresh water that is free from particles, sludge and
other impurities.
Containers used for mixing coolant must be in-
tended for the purpose and free from any dirt or
contaminants. When the containers not in use
they must be kept closed to avoid collecting dirt
and dust.
Within the coolant change interval, coolant may
only be reused if it has been cleaned of dirt,
sludge and particles. If the coolant is contaminat-
ed with oil or fuel, it must not be reused.
Addition of antifreeze and corrosion
protection to water
The coolant should contain 35-55% by volume
antifreeze (ethylene glycol) and corrosion pro-
tection. The percentage varies depending on the
need for antifreeze.
A minimum of 35% by volume of Scania anti-
freeze and corrosion protection is needed to pro-
vide sufficient corrosion protection.
Measure the ethylene glycol content (antifreeze
and corrosion protection) with a refractometer
following the instructions in the Changing the
coolant and cleaning the cooling system section.
Risk of freezing
The engine should not be subjected to heavy
loads when ice starts to build up in the cooling
system.
As the coolant starts to freeze, the water in the
coolant starts to crystallise and the percentage of
ethylene glycol in the coolant therefore rises. 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 protection, or an
equivalent mixture of a similar product, is at
least 35% by volume.
Minimal ice formation in the coolant sometimes
causes disruptions without any risk of damage.
For example, the auxiliary heater may not work
for up to 1 hour after the engine has been started.
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