operators_manual

depending on the outside
temperature.
9.
Maintain a low idle until the
thermostat opens and the
operating temperature stabilizes. A
sign that the thermostat has
opened is when the upper coolant
pipe gets hot on the bottom side
indicating hot coolant is now
running through it.
10. Add coolant to the surge tank until
the coolant remains 1/2 in. (13 mm)
above the "MIN" level.
11. Operate the engine at high idle for
10 minutes. Afterward, add coolant
to the surge tank until the coolant
remains 1/2 in. (13 mm) above the
"COLD FULL" line.
12. Reinstall the surge tank fill cap.
Check the coolant level before and after
each trip. Add coolant as necessary.
Coolant may not immediately appear at the
correct level after the radiator has been
filled. Air may be trapped in the cooling
system, which will affect the coolant level
until the air is purged.
After servicing the cooling system,
continue monitoring it for 3-5 days. The
coolant level in the surge tank will lower
when air trapped in the cooling system is
purged. During each pre-trip inspection you
should inspect recently serviced
components of the cooling system for signs
of coolant leaks.
NOTE
If the coolant frequently needs top-
ping-up
or there are any signs of cool-
ant leakage, consult a PACCAR Serv-
ice dealer.
Electrical System
WARNING
Battery posts, terminals and related
accessories
contain lead and lead
compounds, chemicals known to the
State of California to cause cancer and
reproductive harm. Wash hands after
handling.
WARNING
Before attempting any work on the bat-
teries
or electrical system, remove all
jewelry. If metal jewelry or other metal
comes in contact with electrical cir-
cuits, a short circuit may occur causing
you to be injured, as well as electrical
system failure and damage.
CAUTION
DO NOT modify or improperly repair
the
vehicles electrical system or power
distribution box. All electrical repairs
should be performed by an authorized
dealer. Improper repair or modifica-
tions will void your warranty and/or
cause serious damage to your vehicle.
Engine Aftertreatment System
Power Requirements
The engine aftertreatment system uses
battery power for up to 10 minutes after the
ignition is turned of
f. After the ignition turns
off, the engine aftertreatment system
circulates DEF to help cool down the fluid
MAINTENANCE - Electrical System
256 Y53-6110-1A1 (01/21)
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