Chevrolet 1999 Monte Carlo Owner's Manual page 195

CAUTION:
An electric engine cooling fan under the hood can
start up even when the engine is not running and
can injure you. Keep hands, clothing and tools
away from any underhood electric fan.
If the coolant inside the coolant recovery tank is boiling,
don't do anything else until it cools down.
The coolant level should be at or above the COLD mark
on a cold engine. The coolant level should be at or
above the HOT mark on a hot engine. If it isn't, you
may have a leak in the radiator hoses, heater hoses,
radiator, water pump or somewhere else in the
cooling system.
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