Peterbilt 325 2017, Operator'S Manual, Page: 292 / 392

COOLING SYSTEM
Topping Off
WARNING!
Removing the fill cap on a hot en-
gine can cause scalding coolant
to spray out and burn you badly.
If the engine has been in opera-
tion within the previous 30 minutes,
be very careful in removing the fill
cap. Protect face, hands, and arms
against escaping fluid and steam by
covering the cap with a large, thick
rag. Do not try to remove it until the
surge tank cools down or if you see
any steam or coolant escaping. In
any situation, remove the cap very
slowly and carefully.
Be ready to
back off if any steam or coolant be-
gins to escape.
NOTE
If frequent topping off is necessary
and there are no visible signs of
coolant leaks when the engine is
cold, check for leaks with the engine
operating at normal temperature.
Top off the cooling system when
coolant does not rise to the level
indicated as ‘MIN’ on the surge tank.
The surge tank is translucent which
allows the coolant level to be seen.
Surge Tank
NOTE
Do not use the pressure cap to fill the
surge tank with fluid.
Proper Coolant Level
NOTE
Do not overfill a cooling system. Ex-
cess coolant may result in overflow,
loss of antifreeze, and reduced cor-
rosion protection.
•
The minimum fluid level is
determined by the line on the
surge tank indicated by the letters
"MIN". This indicator is located
below the fill cap.
•
The cooling system will need fluid
if the surge tank level does not rise
to the "MIN" line regardless if the
system is hot or cold.
5-82
Y53-6060-1C1 (03/17)
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