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AnswerWater vapor will sometimes exit your car's vents when hot humid air passes through the A/C cooling system too fast for the condensing moisture to form into water droplets.

This can be resolved by selecting recycled air from inside the car, but the vapor is not harmful and usually doesn't last long.

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Q: Why is smoke coming from the air conditioner vent when the air is on while the car has been running for a while?
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