2009 Hyundai Sonata Owner's Manual - Page 224

DO-IT-YOURSELF MAINTENANCE 6 9 G050B01A-AAT G050C01NF-GAT Recommended Engine Coolant 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. Ambient Engine Coolant concentration temperature Antifreeze Water solution °F (°C) 65% 5 (-15) 35% 60% -13 (-25) 40% 50% -31 (-35) 50% 40% -49 (-45) 60% To Check the Coolant Level G050D01NF-GAT To Change the Engine Coolant The engine coolant should be changed at those intervals specified in the vehicle maintenance schedule in Section 5. ! CAUTION: G050C01NF The coolant level can be seen on the side of the plastic coolant reservoir. The level of the coolant should be between the "L" and "F" lines on the reservoir when the engine is warm with it at idle . If the level is below the "L" mark, add engine coolant to bring it up to "F". 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. o Engine coolant can damage the finish of your car. If you spill engine coolant on the car, wash it off thoroughly with clean water. o The engine in your vehicle has aluminum engine parts and must be protected by an ethylene-glycol base coolant to prevent corrosion and freezing. Do not use hard water. Hard water can cause engine damage from corrosion, overheating or freezing. 1. Park the car on level ground, set the parking brake and remove the radiator cap when cool.