2009 Hyundai Sonata Owner's Manual - Page 225

6 DO-IT-YOURSELFMAINTENANCE 10 HNF5008 G050D02NF-A G050D01NF 2. Wrap a thick cloth around the radiator cap and slowly turn the radiator cap counterclockwise without pressing down on it, until it stops. This relieves any pressure remaining in the cooling system. When you are sure that all the pressure has been released, remove the radiator cap by pushing down and turning counterclockwise. 3. Be sure your drain receptacle is in place. Open the drain cock on the radiator. Allow all the engine coolant to drain from the cooling system, and then securely close the drain cock. 4. Check Section 9 for the capacity of the cooling system in your car. Then, following the manufacturer's directions on the engine coolant container, add the appropriate quantity of coolant to the radiator. 5. Slowly fill the radiator with the proper coolant mixture (see the "Recommended Engine Coolant in previous page) until the fluid level stays up in the radiator neck. And pump the radiator hose in order to bleed the air. 6. Run the engine at idle until the coolant circulates. If the cooling fan operates and the coolant starts to circulate, add the coolant to the reservoir. 7. To bleed the air in the cooling system, repeat procedure 6 until the cooling fan operates 3~5 times. 8. Replace the radiator cap and turn it until tightly installed. And then, add coolant to the reservoir until the level is between "L" and "F". 9. Stop the engine and check the coolant level when the engine is cool. The level of the coolant should be the "L" and "F" lines on the reservoir. If the level is below the "L" line, repeat the procedure 4~8 until the level between "L" and "F".