1993 Chevrolet Lumina Owner's Manual - Page 215

If this light comeson, it means you're low on engine coolant. To Add Coolant: If you need morecoolant, add the proper mix at the coolant recovery tank. Turning the radiator pressure b cap whenthe engine and radiator are hot can allow steam and scalding liquidsto blow out and burn you badly. Withthe coolant recovery tank, you will almost never have add coolantat to the radiator. Never turn the radiator pressure cap-even a little-when the engine and radiator are hot. Add coolant mixat the recovery tank, but be careful not to spill it. I You can be burned if you spill coolant onhot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts arehot enough. Don't spill coolant on a hot engine. I