Peterbilt 365 Manual page 228

MAINTENANCE - Cooling System Maintenance
Glycol Concentration Level
Level
Recommended
5
Levels
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
226
degradation and could result in damage to
the cooling system and engine
components. Consult your dealer or
the coolant manufacturer's representative
Desired
for recommended extended life coolant test
Freeze
Coolant
kits, test strips, and laboratory sample
Point °F
/ Water
procedures.
(°C)
Ratio
Coolant Extender
40% -12 (-24)
Add extended life coolant extender, if
45% -23 (-31)
necessary, according to the corrosion
inhibitor concentration required. DO NOT
50% -34 (-37)
add coolant extender to nitrite-free coolant.
55% -50 (-46)
Checking Coolant Level
60% -62 (-52) Check the coolant level daily. See
Level on page 227.
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
Coolant
CAUTION
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.
Y53-6076-1D1 (09/20)