Cooling System; Coolant Level Check - Mack Granite GU Series Operator's Handbook Manual

MAINTENANCE AND LUBRICATION 281

COOLING SYSTEM

The cooling system is a pressurized system. The coolant is circulated by a
centrifugal pump. It is a typical system in most respects, but there are a few
things to keep in mind when checking or working on the cooling system.
WARNING
Keep clear of fan when engine is running. Fan may start to rotate at high
speed without warning.
WARNING
Avoid injury when checking coolant in a hot engine. Wait for the engine to
cool prior to checking the level whenever possible.

Coolant Level Check

WARNING
Turn the cooling system pressure cap counterclockwise slowly. After the
pressure has completely dissipated, continue turning to remove the cap.
Your MACK model chassis has a pressurized plastic coolant expansion tank
where quick checks of coolant level can be made and additional coolant can
be added to the system. The expansion tank is mounted on the radiator.
Periodically, the coolant level should be checked by observing the coolant
in the expansion tank.