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Q: Temp ran up to 210 degrees Put in new 185 thermostat temp still reads 200 why? on 2006 Pontiac Solstice

I knew to burp trapped air from motor. What else can be done could it be a bad sensor?
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Is the cooling fan (radiator) coming on by 215F? If so , what's the problem? Normal operating temp is over 200F. Putting the wrong (to cold) thermostat in will create other problems.
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