OPM 250 en-GB 36
©
Scania CV AB 2016, Sweden
Cooling system
Checking coolant antifreeze
and corrosion protection
Use only pure fresh water that is free from parti-
cles, sludge and other impurities.
Tools
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 content with a refrac-
tometer.
The following rules apply to ethylene glycol-
based coolant:
• The antifreeze and corrosion inhibitor content
must be minimum 35 percent by volume 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.
Designation Illustration
Refractometer
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