GMC 1999 Sierra 1500 Pickup Owner's Manual page 254

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PO593
The coolant level should be at or above the COLD mark. 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.
Heater and radiator hoses, and other engine parts, can be very hot.
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Don't touch them. If you do, you can be burned.
Don't run the engine if there is a leak. If you run the engine, it cou
lose all coolant. That could cause an engine fire, and you could be
burned. Get any leak fixed before you drive the vehicle.
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NOTICE
Engine damage
from running your engine without coolant isn't covered by
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your warranty.
If there seems to be no leak, check to see if the electric engine fan
(if
you
have one) is running.
If
the engine is overheating, the fan should be running.
If it isn't, your vehicle needs service.
Start the engine again to see if the regular fan runs when the engine does.
If it doesn't, your vehicle needs service. Turn off the engine.
How to Add Coolant to the Coolant Recovery Tank
If
you haven't found a problem yet, but the coolant level isn't at or above
COLD, add a
50hO
mixture of clean water (preferably distilled) and a proper
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