operators_manual

7. During low rpm idle, air will purge
from the cooling system which will
lower the coolant level in the surge
tank. Continue to fill the surge tank
until the coolant level remains
approximately ½ 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 ½ in.
above the "MIN" level.
10. Operate the engine at high idle for
another 10 minutes and then fill the
surge tank again to ½" 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 65
percent concentration of antifreeze, as a
shortened heater life will result.
After servicing the cooling system, operate
the vehicle for a day or two before using
the heater. Trapped air inside the engine
needs time to escape.
Extended Life Coolant
Information on using Extended Life Coolant
(ELC).
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
ASTM D6210 and Caterpillar EC-1
specifications must be used.
The change interval for extended-life
coolant containing nitrite and molybdate is
750,000 miles (1,200,000 km) or 12,000
hours of on-road use (8 years or 15,000
hours of off-highway use) on initial fill with
no extender added. The change interval is
1,000,000 miles (1,600,000 km)/20,000
hours/8 years with an extender addition at
500,000 miles (800,000 km)/10,000
hours/4 years.
Nitrite-Free Extended Life Coolant
Nitrite-free organic acid technology coolant
(OAT) may be used if it meets DAF 74002.
The change interval for nitrite free coolant
is 600,000 miles (1,000,000 km) or 6
years, with no extender needed. DO NOT
add coolant extender to nitrite-free coolant.
Follow the coolant supplier's drain/flush/fill/
diluting percentages when servicing a
vehicle filled with nitrite-free coolant.
Additional Recommendations:
• Antifreeze is essential for freeze,
overheat, and corrosion protection.
The use of supplemental coolant
additives (SCAs) is not
recommended for extended-life
coolants.
Recommended Extended Life
Coolant Suppliers
Authorized PACCAR Engine dealer
®
MAINTENANCE - Cooling System Maintenance
Y53-6047-2HEN (03/18) 227
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