Checking Coolant Level - Isuzu 4BG1 Instruction Manual

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Coolant leakage
Check the radiator and water pump hose connections also
the water drain cocks on the radiator and cylinder body for
leakage.
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Exhaust smoke or gas leakage
Checking coolant level
The coolant level could drop depending on the equipment
because the mixed air is expelled in about 5 minutes after the
engine started.
Stop the engine, remove radiator cap, and add coolant.
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