Why does the AC sysmbol light come on when the heat is turned on and set to defrost-vent and will not turn off even when shut off button is hit?

DO NOT FEAR THIS !!! The ac comes on with the defrost: because do you ever use your ac in the winter? me neither. Manufactures have made the ac come on with the defrost to prevent the ac compressor from seizing up. Since we never use them in winter, at least in cold climates. Cheers and drive on.