3. Fill line
1. If your cooling system is built with
an air bleed valve in the upper
engine coolant pipe, open it before
filling the surge tank.
2. Close any open coolant drain
valves in the lower engine coolant
pipe.
3. Remove the surge tank fill cap (1).
DO NOT remove the surge tank
pressure cap.
4. Fill the system with premixed
coolant through the surge tank fill
cap. Pour coolant at a steady flow
rate until the surge tank is full (to
the "MIN" line). It may be
necessary to pause for 1 minute
and then re-fill if the fluid level
dropped.
5. Close the air bleed valve that was
opened in Step 1.
6. Start the engine and idle at low
rpm.
7. During low rpm idle, air will purge
from the cooling system via the
surge tank's coolant fill cap. This
will lower the coolant level in the
surge tank. Continue to fill the
surge tank until the coolant level
remains approximately 1/2 in.
above the "MIN" line. This may
take up to 2 minutes, depending on
the outside temperature.
8. Operate the engine throttle until the
operating temperature stabilizes
(when the thermostat opens).
9. Fill the surge tank as necessary to
raise the coolant level to 1/2 in.
above the "MIN" level.
10. Operate the engine at high idle for
another 10 minutes and then fill the
surge tank again to 1/2 in. above
the "MIN" level.
11. Replace the surge tank fill cap.
Check the coolant level after each trip. Add
coolant as necessary. You may find your
coolant level is not up to the correct level
soon after you have filled the radiator. This
may be because all the trapped air in the
system has not yet been purged. It takes a
little time for all of the air to leave the
system after you fill your radiator.
Use a solution of half ethylene glycol
antifreeze and half water for best heater
performance. Do not use more than 60
percent concentration of antifreeze, as a
shortened heater life will result.
After servicing the cooling system, monitor
the cooling system for several days.
Trapped air inside the engine needs time
to escape and will lower the coolant level in
the surge tank when it does. As part of
each pre-trip inspection, look for signs of
coolant leaking in the areas that were
serviced.
NOTE
If the coolant frequently needs top-
ping-up or there are any signs of cool-
ant leakage, consult a PACCAR Serv-
ice dealer.
Extended Life Coolant
Perform these maintenance procedures
according to the Preventative Maintenance
Schedule.
• Conduct coolant maintenance
checks including freeze point, pH,
nitrite and carboxylate tests at least
twice annually to maintain engine
protection.
Nitrited Extended Life Coolant
For nitrited formulations (NOAT), a heavy-
duty extended life coolant that meets
MAINTENANCE - Cooling System Maintenance
Y53-6076-1D1 (09/20) 229
5
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