Car still overheating at stoplights and coolant full?

car is still overheating even though the mechanics have changed the radiator, radiator fan, thermostat? I notice the temp goes up when I'm at stoplights waiting but on the fwy, no problem. Also, after they changed the thermostat, the next day in the morning I checked the radiator and the coolant as I was opening it spilled but resovoir is full of coolant and also the radiator? My car is a 2003 Honda civic automatic, 4 cylinder. Please help?

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