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The heater valve may be damaged or stuck, or the heater control knob may be damaged.

That may be true, but do you mean to ask, "Why is the AC on with the heat?"

If the latter is your question, that is because the air conditioning drys the air better, and dry heat is more useful.

The air "conditioning", chills the temp of the air below dew point, which removes the moisture from it. Then, if you have the heater or defroster switched on, the air is then heated (if the heater is on); this is done and is advantageous because they dryer warm air will defrost the windows faster or dry your clothes if you have been caught in the rain or snow.

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16y ago

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