Like a month ago my radiator was leaking and both the radiator and the sensor was changed. Since than after couple of minutes I start to drive my car, radiator light comes out but I just ignored it.
Yesterday my car is overheated. I checked oil and radiator fluid and they were all there in proper levels. When I wait some time engine cools down little bit and start to drive little bit and overheat again. I searched the forum, people talk about some fake overheat issues, I checked the radiator and it was literally boiling at the time so I believe it is not an issue with the temp gauge.