My earlier post may have been overlooked, replace your pressure cap. The cooling systems are designed to operate when pressurized. No pressure=no cooling.
I had this problem a couple years ago, new thermostat, flushed the radiator, premium HOAT antifreeze and it was still running hot. Spent $6.99 on a new cap and temps never went over 210.
Less than $10 and less than a minute to replace.
As stated by old mech, DO NOT REMOVE THE CAP WHILE HOT!!!!
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