95 cadillac STS running temp in ARIZONA?

I have a 95 cadillac seville STS and I just replaced the radiator, as well as put in a 180 degree thermo. I live in AZ and in the heat of the daymy car is running in the lower 220's. Now to me this seems high, but everyone i ask is split on this matter. So please anything would help, and if you could back it... show more I have a 95 cadillac seville STS and I just replaced the radiator, as well as put in a 180 degree thermo. I live in AZ and in the heat of the daymy car is running in the lower 220's. Now to me this seems high, but everyone i ask is split on this matter. So please anything would help, and if you could back it up with proof would be better.... thank you much
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