Chevrolet 1993 S-10 Pickup Owner's Manual page 273

Adding Coolant
KO625
To Check Coolant: When your engine is cold, the coolant level should be at
ADD, or a little higher. When your engine is warm, the level should be up to
FULL HOT, or a little higher.
To Add Coolant: If you need more coolant, add the proper mix at the
coolant recovery tank.
A
Turning the radiator pressure cap when the engine and radiator are
hot can allow steam and scalding liquids to blow out and burn you
badly. With the coolant recovery tank, you will almost never have to
add coolant at the radiator. Never turn the radiator pressure
cap-even a little-when the engine and radiator are hot.
Add coolant mix at the recovery tank, but be careful not to spill it.
A You can be burned
if
you spill coolant on hot engine parts. Coolant
contains ethylene glycol, and it will burn if the engine parts are hot
enough. Don't spill coolant on a hot engine.
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