fwiw, ive been told in the past to keep the fresh air setting on a much as possible to avoid mold growth. so i usually drive with the ac off and the fresh air setting on. occasionally, i will get a musty smell after it rains, but it will go away after driving the car for a bit. to avoid this, i put the air on recirculate mode if i am in the car when it is raining.
basically, damp & warm air will promote mold growth. so keep the fresh air coming in to dry everything out, or keep the ac on to keep it cold.
edit: i don't think it is possible to have outside air and the ac on at the same time.
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2011 Nissan 370z | 6MT | Magnetic Black | Sport Package
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