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Originally Posted by nmoulton
The A/C is supposed to run in the defrost position, and that is how it works on all (most) modern cars. It works this way because the A/C removes the moisture from the air, which helps to clear condensation from the glass quicker. Also, remember that the temperture control can be adjusted to somewhere in the middle where the air is not too hot or too cold, even with the A/C on.
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Any and every Gm car runs the A/C compressor when the defroster is selected.