My car is Hyundai sonata 2004 v6 I have over heating I just flushed the radiator out, changed the thermostat, changed the cap,changed the temperature sensor,water pump is working ,no leaks and fans are working but it still over heats what could the problem be? My car is Hyundai sonata 2004 v6 I have over heating I just flushed the radiator out, changed the thermostat, changed the cap,changed the temperature sensor,water pump is working ,no leaks and fans are working but it still over heats what could the problem be?

Look at the front of the car threw the grill. You will be looking at the A/C condenser, but they can get clogged up. No air threw the condenser, means no air threw the radiator.

Try this procedure:

• The thermostat can be stuck close. If you feel the upper hose very hot and the lower hose cooler than normal, it may be a stuck thermostat.

• Make sure the radiator and the overflow bottle are filled to the proper levels.

• Bleed air from the coolant system:This is best done by running the engine with the radiator cap off until you see when the air bubbles stop coming up.

• Check the radiator fans: The easiest way is to turn on the cars air conditioner and turn up the A/C fans. Both radiator fans should come on when the A/C starts

• Make a pressure test by using a pressure testing tool (available at most auto parts stores). Use the pressure shown on your radiator cap. Most cars are 16 PSI or less, so don't exceed that pressure. Replace the radiator cap if it doesn't hold the pressure.

Boy you have done everything I'd suggest to try,the only thing I can think of when you installed the thermostat did the housing holding it craft maybe a hairline just big enough to cause pressure problems, only other thing else is maybe you have a clog in a hose or in the radiator sorry that's all I got,other then the thermostat they sold you was junk one thing I'd try returning it and get a new one you never said it it was used or new