2004 Hyundai Elantra Owner's Manual - Page 191

DO-IT-YOURSELF MAINTENANCE 6 7 G050B01A-AAT Recommended Engine Coolant Ambient Engine Coolant concentration temperature Antifreeze Water °F (°C) solution 65% -5 (15) 35% 60% -13 (-25) 40% 50% -31 (-35) 50% 40% -49 (-45) 60% G050C01A-AAT To Check the Coolant Level G050B01E G050D01E Use a high quality ethylene-glycol coolant in a 50/50 mix with water. The engine coolant should be compatible with aluminum engine parts. Additional corrosion inhibitors or additives should not be used. The cooling system must be maintained with the correct concentration and type of engine coolant to prevent freezing and corrosion. Never allow the concentration of antifreeze to exceed the 60% level or go below the 35% level, or damage to the cooling system may result. For proper concentration when adding or replacing the engine coolant, refer to the following table. The coolant level can be seen on the side of the plastic coolant reservoir. The level of the coolant should be between the "LOW" and "FULL" lines on the reservoir when the engine is cold. If the level is below the "LOW" mark, add engine coolant to bring it up between "LOW" and "FULL". If the level is low, inspect for coolant leaks and recheck the fluid level frequently. If the level drops again, visit your Hyundai dealer for an inspection and diagnosis of the reason.