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Did you burp the coolant? If not, you have air bubbles in the system that are trapped behind the thermostat, keeping it from opening. Run the car at idle until it's 3/4 of the way to overheating, then shut it down and let it cool. Pop the radiator cap and the air bubbles will burp out. Check the level of coolant in the radiator and expansion tank, top off as needed, and repeat a couple times, and you should be good to go.