1998 Pontiac Grand Prix Owner's Manual - Page 303

NOTICE: If you use an improper coolant mixture, your engine could overheat and be badly damaged. The repair cost wouldn't becovered by your warranty. Too much water in the mixture can freeze and crack the engine, radiator, heater core and other parts. If you have to add coolant more than four times a year, Checking Coolant have your dealer check your cooling system. i When your engine is cold, the coolant level should be at the COLD mark or a little higher. When your engine is warm,the level should be up the HOT mark or a to little higher. NOTICE: If you use the proper coolant,you don't have to add extra inhibitors additives which claim to or improve thesystem. These can be harmful. 6-28