Those temps. are indeed high, so replacing the thermostat and flushing the cooling system would be a wise move. I'd also pressure wash the AC condenser 'cause any dirt or dead insects stuck between the fins will prevent cool air from reaching the radiator.
FWIW the highest temp. I usually see from my engine is 90*C (194*F).
^THIS^
I ran a Supercharged 302 Stroker... In Alabama, at Barber Motorsports Park, when it was 105 degrees and about 95% humidity it hit about 205 degrees to 215 degrees running it hard for 30-60 minutes on a track... Normal driving on a stock motor, you should be seeing 190 - 205 degrees (depending on what thermostat is in it... If it's a 192 degree thermostat... It could run up into the 215 degree range) .
Replace the thermostat with a 180 degree Stant Superstat, and flush the system.... Not just drain and refill... But have it flushed professionally to get any sediment out of the radiator. Use a pressure washer, or air hose, or garden hose with a good sprayer, to wash out the radiator and AC condensor fins from the back toward the front (engine side to the bumper side) ... You should pull the fan and shroud assembly to be able to spray out all the areas of the radiator.
When you refill the cooling system DON'T use a pre-mix 50 / 50 coolant... As long as you don't really drive or store the car in freezing temperatures use a 70/30 mix of DISTILLED water and full strength coolant. Pure distilled water has better heat transfer properties than glycol based coolants. (Link to a "White paper" on this topic is below) As evidence that this works... Ford even recommended that coolant ratio be reduced to 60 (water) 40 (coolant) for better cooling in the Ecoboost F-150's
You can also add a "water wetter" additive to reduce surface tension of the water and get even better cooling (might see 1-10 degrees less with a "water wetter" product in a 70/30 or 80/20 mix)
Read:
https://www.redlineoil.com/Content/files/tech/WaterWetter Tech Info.pdf
If you drive or store the car in freezing temps go to 60/40 mix... If it sees sub-zero temps go ahead with the 50/50. I think this recommendation is even in the owners manual.
Hope you get it running nice and cool.
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