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How hot is it getting? Is it going all the way into the red? How did the problem start?

No, I'm afraid you're wrong about that. That fan is programmed to come on at 223degrees so 219 is not too hot and completely normal.

I just gave you the documentation on the engine temp. If you have heater problems, that could be something entirely different.

Here's how you check that out.

With the engine at full operating temp, locate the 2 heater hoses where they go into the firewall and feel them to see if they are both hot to the touch. If not too hot to hold, then you have to look at the actual engine temp and if that is up, if it is, then your looking at a restricted heater core.
If you find that they are both too hot to hold, then the heat in that vehicle is controlled by a blend door that regulates heated air flow. It is operated by an electric motor/actuator. The problem can be that the actuator is stripped or inoperative or the door itself could be damaged. This is what needs to be determined by examining the actuator and see if it is responding to heat change commands or not.
If they are both not too hot to hold on to, then you either have a restricted heater core or the system is not completely full and getting air pockets for some reason.

If both hoses were host, your cooling system is fine so forget the flush. You have a problem with the blend door