Geo 1995 Prizm Owner's Manual page 177

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NOTICE:
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Engine damage from running your engine
without coolant isn't covered by your warranty.
If there seems to be no leak, with the engine on check to
see if the electric engine fan is running. If the engine is
overheating, the fan should be running. If it isn't, your
vehicle needs service.
How to Add Coolant to the Coolant
Recovery Tank
If you haven't found a problem yet, but the coolant level
isn't at FULL, add a 50150 mixture of clean water
(preferably distilled) and a proper antifreeze at the
coolant recovery tank. (See "Engine Coolant" in the
Index for more information about the proper coolant
mix.)
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