Peterbilt Model 320 Operator's Manual after 8-07 - Peterbilt Motors ...

PART 8: MAINTENANCE AND SERVICE
Engine Cooling System
Refilling Your Radiator
Proper Coolant Level
03019
Surge Tank
NOTE: Do not overfill a cooling system. Excess
coolant may result in overflow, loss of antifreeze,
and reduced corrosion protection.
• The proper coolant level for a cold engine is at the base
of the filler neck extension tube.
• The proper coolant level for an engine at normal operating
temperature is even with the pressure cap seal.
1. Be sure the radiator and engine block drains are
closed.
2. Move the heater control to maximum heat position.
3. Remove the surge tank pressure cap
4. Through the surge tank, fill the system with premixed
coolant. Pour it in a steady flow until the radiator is full.
5. Start the engine.
6. Idle at low RPM.
7. Complete the filling. Do it as quickly as possible.
8. Idle the engine until it reaches normal operating temperature.
9. Fill the radiator as necessary to raise the coolant level
to the proper reading. Replace the surge tank pressure
cap.
Check the coolant level after each trip when the engine
has cooled. 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 the air to leave the system after you fill
your radiator.
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