© 2020 Pierce Manufacturing Inc. All Rights Reserved. Engine, Cooling, Fuel and Exhaust / 6-23
MAINTENANCE
6-18.6 Coolant
Use a refractometer to check coolant solution. Follow the manufacturer’s mixing proportions to obtain desired
protection.
Drain, flush, and refill cooling system annually. Refer to the Pierce Service Manual, group 0401-P-003, Cooling
System Service, and the engine manufacturer’s operator’s manual for additional information.
6-18.7 Antifreeze Type
NOTE: It is recommended to replenish or refill the cooling system with antifreeze not only of the same type,
but also the same color. Mixing colors can create a muddy appearance which makes visual
inspection more difficult.
Figure 6-6: Antifreeze Type Information Labels
2872361, 91-9393
Radiator, radiator cap, coolant, and hoses are very hot and pressurized during truck operation. Let
radiator cool before checking system.
Use extreme care when removing the radiator cap. Always allow engine to cool completely before
opening radiator cap. Wrap a thick, heavy cloth around cap. Push down and turn radiator cap to first
notch position. Pause before opening completely to allow any remaining pressure to escape. Failure
to comply could result in burns from hot steam or coolant.
Proper corrosion inhibitor levels must be maintained to prevent premature engine failure. Refer to the
engine manufacturer’s manuals for proper checking procedures.
Selecting the proper antifreeze type is vital to system performance. Mixing antifreeze types may result
in decreased performance and corrosion protection, and may result in engine damage that may not be
covered under the engine manufacturer’s warranty.
ALWAYS verify the antifreeze type used in your vehicle. Select an equivalent type which meets or
exceeds the engine manufacturer’s standards.
Refer to the engine manufacturer’s Operator and Maintenance manual(s) for approved coolant types,
mixtures, inhibitors, and additional information.
EXTENDED-TYPE INSTRUCTION LABEL STANDARD-TYPE INSTRUCTION LABEL
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