Isuzu AU-4LE1T, Maintenance Manual

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If no steam or engine coolant can be seen or heard, open the engine
access cover. If the engine coolant is boiling, wait until it stops before
proceeding. Look at the see-through reserve tank. The engine
coolant level should be between the "MAX" and "MIN" marks on the
reserve tank. If necessary, pour engine coolant into the reserve tank
only, never directly into the radiator. Also, do not check engine
coolant level at the radiator.
Make sure the fan belts are not broken, or off the pulleys and that the
fan turns when the engine is started.
If the engine coolant level in the reserve tank is low, look for leaks at
the radiator hoses and connections, heater hoses and connections,
radiator, and water pump. If you find major leaks, or spot other
problems that may have caused the engine to overheat, do not run the
engine until these problems have been corrected. If you do not find a
leak or other problem, carefully add engine coolant to the reserve tank.
(Engine coolant is a mixture of ethylene glycol antifreeze and tap water
(soft water), distilled water or demineralized water. See "Engine Care
in cold season" in Section 6 for the proper antifreeze and mixture.)
WARNING:
To help avoid being burned, do not spill antifreeze or engine
coolant on the exhaust system or hot engine parts. Under
some conditions the ethylene glycol in engine coolant is
combustible.