2002 Cavalier gets to high temp.

Hello, I have a 2002 Cavalier. I have gone through and changed the Thermostat twice along with the Radiator Coolant Level Sensor once. On cool days the car temp runs fine and never overheats but on warm days the temp. goes up to about 220 before the you hear the fan kick on and cool it back down to where it should be. Any help would be greatly appreciated.