OPM 300 en-GB 62
© Scania CV AB 2020, Sweden
Cooling system
Checking the coolant's anti-
freeze and corrosion protec-
tion
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 inhibi-
tor 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 inhibitor content
greater than 55 percent by volume impairs 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.
Tool
Description Illustration
Refractometer
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