CAUTION
The engine cooling system has very
specific maintenance and inspection
requirements. Failure to follow require-
ments can damage the engine. Engine
damage can include but is not limited
to freezing, boiling, corrosion, pitted
cylinder liners. This information is
found in the engine manufacturers
owner’s manual. It is the owner’s re-
sponsibility to follow all requirements
listed in the engine manufacturers
owner’s manual.
NOTE
Coolant is harmful to the environment.
Unused coolant must be stored as a
toxic hazardous material in leakproof
containers. Used coolant must be
processed as industrial chemical
waste. Please follow HAZMAT guide-
lines with both used and unused cool-
ants.
CAUTION
Use of non-genuine PACCAR coolant
filters can cause severe engine dam-
age.
Concentration
Check the level of freeze/boilover
protection, which is determined by the
glycol concentration. Use a glycol
refractometer to determine glycol level.
Add coolant to obtain the coolant/water
ratio required to provide the protection you
need. A 50/50 mix of coolant and water is
adequate for most applications. For
extremely cold operating conditions, the
ratio can be adjusted to a higher
concentration of coolant.
NOTE
Maximum recommended ELC concen-
tration is 60% ELC and 40% water by
volume (a 60:40 coolant mixture). The
minimum recommended concentration
is 40%.
Glycol Concentration Level
Level
Desired
Coolant
/ Water
Ratio
Freeze
Point °F
(°C)
Recommended
Levels
40%
-12 (-24)
45%
-23 (-31)
50%
-34 (-37)
55%
-50 (-46)
60%
-62 (-52)
Condition
Perform a visual inspection of the coolant.
It should have no cloudiness or floating
debris. Determine the chemical inhibitor
concentration level by using an extended
life coolant specific test kit or test strips.
Inhibitor concentration level determines
corrosion protection. If you are concerned
about possible coolant quality,
contamination, or mechanical problems,
submit a coolant sample for analysis.
Improper maintenance may cause coolant
ENGINE MAINTENANCE - Cooling System Maintenance
Y53-1183-1G1 (05/19)
47
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