How do you change the thermostat on a 2004 Hyundai Sonata sl?

Answer 1

After the engine is cool.

First on the lower radiator hose leading the the engine remove the 2 screws from the bell housing attaching it to the engine.

Next once the screws are removed, pull the bell housing with the lower radiator hose attached slightly to the right then pull it up to help conserve the antifreeze that will come out.

Then you will be able to see the thermostat. Remove the old thermostat, but make sure you look at the position of the old thermostat. The gasket on the thermostat has a notch on it so make sure you align the notch correctly so that the gasket and thermostat are fully seated.

After the gasket an thermostat are properly seated, place the bell housing back over the thermostat and secure it with the 2 screws.

Finally start the vehicle and replace the antifreeze that was lost while removing the thermostat.