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Originally Posted by xsperf
. . on the vents, the knob with the red and blue colors for like hot and cold, what EXACTLY does it do? i know if you have your heater on put it on red and if you have the AC on put it on blue... but it really doesnt seem to make a big difference
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It's basically to keep you awake while driving. You can set the vent to hit your face with the temp that keeps you alert. Here it is, straight from the owner's manual . .
