1998 Pontiac Grand Am Owner's Manual - Page 260

NOTICE: If you usean improper coolant mixture, your engine could overheat andbe badly damaged. The repair cost wouldn't be covered your by 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, have your dealer check your cooling system. Checking Coolant I NOTICE: I you use the proper coolant, don't have to f you add extra inhibitors or additives which claim to improve thesystem. These canbe harmful. The coolant surge tank is located on the passenger's side of the engine compartment. 6-27