2003 Pontiac Grand Am Owner's Manual - Page 254

Notice: When adding coolant, it is important that you use only DEX-COOL@(silicate-free) coolant. If coolant other than DEX-COOL is added to the system, premature engine, heater core or radiator corrosion may result. In addition, the engine coolant will require change sooner at 30,000 miles (50888 km) or 24 months, whichever occurs first. Damage caused by the use of coolant other than DEX-COOL@is not covered by your new vehicle warranty. If you haven't found a problem yet, check to see if coolant is visible in the surge tank. If coolant is visible but the coolant level isn't at or above the FULL COLD mark, add a 50/50 mixture of clean, drinkable coolant at the coolant water and DEX-COOL@ surge tank, but be sure the cooling system, including the coolant surge tank pressure cap, is cool before you do it. See Engine Coolant on page 5-23 for more information. How to Add Coolant to the Coolant Surge Tank Nofice: This vehicle has a specific coolant fill procedure. Failure to follow this procedure could cause your engine to overheat and be severely damaged. 5-31