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
degradation and could result in damage to
the cooling system and engine
components. Consult your dealer or
the coolant manufacturer’s representative
for recommended extended life coolant test
kits, test strips, and laboratory sample
procedures.
Coolant Extender
Add extended life coolant extender, if
necessary, according to the corrosion
inhibitor concentration required. DO NOT
add coolant extender to nitrite-free coolant.
Checking Coolant Level
Check the coolant level daily. See Coolant
Level on page 227.
CAUTION
When adding coolant, avoid mixing dif-
ferent brands and formulations. If the
coolant is mixed with more than 25%
of a different formulation (for example,
mixing OAT and NOAT coolants), en-
gine corrosion damage could occur. If
mixing exceeds 25% of total system
volume, it is recommended to flush
and refill the system completely with
one type of coolant.
Coolant Filter
Your engine is equipped with a coolant
filter designed to capture and remove
harmful deposits from the cooling system
to help prolong system life. It is a "blank
filter" and does not contain chemicals or
time-release additives. Replace it only with
a blank filter at the interval specified in the
Preventative Maintenance Schedule.
NEVER use filters that contain
supplemental coolant additives (SCAs) in
an ELC-filled system.
CAUTION
Use of non-genuine PACCAR coolant
filters may cause severe engine dam-
age.
MAINTENANCE - Cooling System Maintenance
226 Y53-6076-1D1 (09/20)
5
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