WARNING
Handle coolant and antifreeze careful-
ly. Ethylene glycol antifreeze is poison-
ous. Store in original fluid container
only, and always keep out of the reach
of children. Never remove the filler cap
(vertically mounted) on the surge tank
while the engine is still hot. Wait until
the coolant temperature is below
120°F (50°C). Scalding steam and flu-
id under pressure may escape and
cause serious personal injuries. The
pressure cap (horizontally mounted)
on the surge tank should never be
opened. Failure to comply may result
in death, personal injury, equipment or
property damage.
Coolant/Antifreeze Condition
Perform these maintenance procedures
according to the Preventative Maintenance
Schedule.
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
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).
ENGINE MAINTENANCE - Maintenance Procedures
64 Y53-1183-1G1 (05/19)
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