I would start by looking at two things. I doubt if you flushing the cooling system has anything to do with it. Any air in the system should be long gone. But did you open up the heating control when flushing and did you leave it on, whilst he levels settled down. Air in the heating system can be a problem removing it.
I suspect that a check of the following could be in order.
It is likley that the coolent hoses are becoming tired. Next time it gets hot, pull over and make sure the hoses are not deforming. Most likely sign will be that the hoses are flatening out. Thus restricting flow, easy to see and is easy to fix. That is the reason why some big hoses, have a copper wound spring inside them.
That not being the problem then it could be the thermostat, changing the thermostat is fairly easy to do, but make sure that you get the right one. You will need also a new seal or gasket and some sealant to
seal the housing. Ensure you get all the old seal or gasket off both surfaces.
You can check the old thermostate, buy putting a pot of water on to stove to boil, hang the thermostate on a piece of string, do not it touch the sides and bottom of pot, and as the water gets hotter the thermostate with slowly open, until when the water is boiling it will be right open.
Regards
Col
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