OK. It happens when it's real cold outside, in the neighborhood of under 20 degrees F (-6 C) and highway speeds. Held my hand to the left side opening where the steering column enters the dash. It was cold air for sure. I don't feel it in the 30 degree F range (-1 C).
Car was at operating temperature and I mixed up the air vents from floor to dash to front vents and combinations of the three and none. This was not related to the fan or heater at all. Just blowing in the wind (pun intended).
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