operators_manual

NOTE
Test the engine coolant at least twice
per year to determine if the coolant
must be replaced. If it is determined
that the coolant should be replaced,
make sure to flush the coolant system.
Contact a PACCAR® Authorized Re-
pair Location for flushing the coolant
system.
1. Check the following anti-freeze
conditions:
• Coolant level
• Freeze point
• pH level
• Nitrite level
• Carboxylate level
Checking Coolant Condition
Recommended coolant checks.
To ensure the Extended Life Coolant (ELC)
in your vehicle always provides maximum
protection, perform the following tests:
1. Check the coolant color at every
maintenance interval. It should have
no cloudiness, floating debris, or oils.
2. Test the freeze point at least twice a
year. A refractometer or test strips
can be used to measure the
protection level.
3. Determine the pH and chemical
inhibitor concentration level by using
an ELC-specific test kit or test strips.
4. Keep the cooling system full by
topping-up using ELC pre-diluted to a
50/50 blend, unless a different ratio
of water/antifreeze has been
substituted (depending on operating
conditions).
NOTE
Inhibitor concentration level de-
termines corrosion protection. If
you are concerned about possi-
ble coolant quality, contamina-
tion, or mechanical problems,
submit a coolant sample to your
dealer 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 manu-
facturer's representative for rec-
ommended extended life coolant
test kits, test strips, and laborato-
ry sample procedures.
Radiator Hoses
Maintenance checks for radiator hoses.
Perform these maintenance procedures
according to the Preventative Maintenance
Schedule.
1. Check the following radiator hose
conditions:
• Hose condition, deterioration/
signs of leaking
• Hose clamp torque
ENGINE MAINTENANCE - Maintenance Procedures
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