OPM 250 en-GB 48
© Scania CV AB 2022, Sweden
Cooling system
Checking the coolant's anti-
freeze and corrosion protec-
tion
Tools
Avoid skin contact with coolant as this may
cause irritation to the skin. Wear eye protection
and gloves when handling coolant.
Use only pure fresh water that is free from parti-
cles, sludge and other impurities.
1. Pour a small amount of coolant into a con-
tainer and check that the coolant is pure and
clear.
2. Change the coolant if it is contaminated or
cloudy.
3. Measure the antifreeze and corrosion protec-
tion content with the refractometer.
The following rules apply to ethylene glycol-
based coolant:
• The antifreeze and corrosion protection con-
tent must be a minimum of 35 per cent by vol-
ume for corrosion protection to be sufficient.
• An antifreeze and corrosion protection con-
tent greater than 55 percent by volume im-
pairs the ability to protect against frost.
• If ice forms in the coolant, there are disrup-
tions initially, but there is no immediate risk
of damage. The engine should not be subject-
ed to heavy loads when ice starts to form.
Designation Illustration
Refractometer
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