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I've always cracked the rear windows where applicable, to help draw fresh air through the vents, keeping the temp selector on high heat and the fan off. I guess if you keep the window open just so much, it creates a vacuum that draws air out of the car, so fresh air has to come in through the vents.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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