2003 Nissan Altima Owner's Manual - Page 185

ENGINE COOLING SYSTEM The engine cooling system is filled at the factory with a high-quality, year-round, anti-freeze coolant solution. The anti-freeze solution contains rust and corrosion inhibitors; therefore, additional engine cooling system additives are not necessary. CAUTION When adding or replacing coolant, be sure to use only a Genuine NISSAN Long Life Anti-freeze Coolant (green) or equivalent with the proper mixture ratio of 50% antifreeze and 50% demineralized or distilled water. The use of other types of coolant solutions or coolant colors, such as orange, may damage the engine cooling system. WARNING ● Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pressure fluid escaping from the radiator. ● The radiator is equipped with a pressure type radiator cap. To prevent engine damage, use only a genuine NISSAN radiator cap. WDI0261 CHECKING ENGINE COOLANT LEVEL Check the coolant level in the reservoir when the engine is cold. If the coolant level is below the MIN level, add coolant to the MAX level. If the reservoir is empty, check the coolant level in the radiator when the engine is cold. If there is insufficient coolant in the radiator, fill the radiator with coolant up to the filler opening and also add it to the reservoir up to the MAX level. If the cooling system frequently requires coolant, have it checked by a NISSAN dealer. Outside temperature down to °C -35 °F -30 Genuine NISSAN Long Life Anti-freeze Coolant or equivalent 50% Demineralized or distilled water 50% Maintenance and do-it-yourself 8-9