2010 Hyundai Elantra Owner's Manual - Page 284

Maintenance OHD076008 Check the condition and connections of all cooling system hoses and heater hoses. Replace any swollen or deteriorated hoses. The coolant level should be filled between F and L marks on the side of the coolant reservoir when the engine is cool. If the coolant level is low, add enough specified coolant to provide protection against freezing and corrosion. Bring the level to F, but do not overfill. If frequent additions are required, see an authorized Hyundai dealer for a cooling system inspection. Recommended engine coolant • Use only soft (de-mineralized) water in the coolant mixture. • The engine in your vehicle has aluminum engine parts and must be protected by an ethylene-glycol-based coolant to prevent corrosion and freezing. • DO NOT USE alcohol or methanol coolant or mix them with the specified coolant. • Do not use a solution that contains more than 60% antifreeze or less than 35% antifreeze, which would reduce the effectiveness of the solution. For mixture percentage, refer to the following table. Mixture Percentage (volume) Ambient Temperature Antifreeze 5°F (-15°C) -13°F (-25°C) -31°F (-35°C) -49°F (-45°C) 35 40 50 60 Water 65 60 50 40 7 17