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Peterbilt 387 - Page 171

Peterbilt 387
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PART 8: MAINTENANCE AND SERVICE ENGINE COOLING SYSTEM
(R10/06) Y53-6007 – 173
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 the air to leave
the system after you fill your radiator.
With the engine cold, top up with premixed coolant of the
desired freeze protection concentration. Add coolant
through the pressure cap neck of the surge tank.
.
Surge Tank
*Pressure Cap = 15 psi
Proper Coolant Level
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 oper-
ating temperature is even with the pressure cap seal.
Refilling Your Radiator
1. Be sure the radiator and engine block drains are
closed.
2. Remove the surge tank pressure cap
3. Through the surge tank, fill the system with premixed
coolant. Pour it in a steady flow until the radiator is full.
WARNING! Handle coolant and antifreeze
carefully. Ethylene glycol antifreeze is poison-
ous. Store in original fluid container only, and
always keep out of reach of children.
4. Start the engine.
5. Idle at low RPM.

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