[xrated]

If I'm not mistaken, basically a sensor that will detect when the evaporator is too cold because of lack of airflow and or very high humidity and is starting to freeze up. It will stop the compressor from running. When the compressor isn't running and the fan is still running, eventually the air that is flowing will become warmer and warmer and eventually thaw out the frozen evaporator. If the freeze sensor has been bumped or fallen away from where it should be located, it cannot detect the evaporator freezing up and the compressor continues to operate...making it freeze even more.