Whether the A/C light is on or not, the heater will still work the same, the only difference is the outside air recirculation. When the A/C light is on, that means the A/C compressor has been turned on. But, the compressor will only cycle on and off if the temp has been changed to cold. Otherwise, the blend door will open to the heater core and let only heat in. Temps between full cold and full heat are controlled by the blend door motor, which turns a door in side the dash to let a mixture of cold air, from the evaporator, and heat, from the heater core, blend together to create your desired temp, which is controlled by the thermostat in the A/C system. This is good info for anyone who cares to know how the A/C system functions!
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