1998 Pontiac Firebird Owner's Manual - Page 228

If there seemsto be no leak, with the engine on, check to see if the electric engine cooling fans running. If the are engine is overheating, both fans should be running. If they aren't, your vehicle needs service. Adding only plain water to your cooling system can be dangerous. Plain water, some other How to Add Coolant to the Coolant or liquid like alcohol, canboil before theproper Recovery Tank If you haven't found a problem yet, but the coolant level coolant mixturewill. Your vehicle's coolant warning system is set for the proper coolant isn't atFULL COLD add a 50150 mixture of clean water mixture. With plainwater or the wrong mixture, (preferably distilled) and DEX-COOL@ engine coolant your engine could get too hot but wouldn't you at the coolant recovery tank. (See "Engine Coolant" in get theoverheat warning.Your engine could the Index for more information.) catch fire and you or others could be burned. Use a 50/50 mixture of clean water and DEX-COOL@coolant. a 1 CAUTION: NOTICE: In cold weather, water can freeze and crack the engine, radiator, heater core and other parts. Use the recommended coolant and the proper coolant mixture. 5-19