The compressor runs the same whether the fan is on high or low. If that little AC light is on, the compressor is turned on.
If your gonna be a smart ass, try to know what your talking about.
Nice that you use such a credible source as "yahoo answers". Almost as foolproof as Wikipedia.
To add on to YG, the compressor is controlled by the engine speed via a belt and pulleys. Car A/C is not set-point-governed. It will run the same in a black car as a white one, despite what you set the temp at.