1997 Chevrolet Lumina Owner's Manual - Page 256

Checking Coolant If this lightcomes on, it means you're low on engine coolant. LOW COOLANT Adding Coolant . .' If you need more coolant, add proper DEX-COOL@ the coolant mixture at the coolant recovery tank, but be careful not to spill it. When your engine is cold, the coolant level should at be the COLD mark or alittle higher. When your engine is warm, the level shouldbe up to the HOT mark or a little higher. If the coolant recovery tank is completely empty, add coolant to the radiator. "Engine Overheating" in (See the Index.) 6-24