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Heated air coming through the vents with the fan on, NOT set to recirculate and temp setting to Low is not normal. No car I have ever owned or currently own has ever done this Except for my 2015 FRS One. Interior venting or conditioned air does not come from under the hood, where there are toxic fumes from heated paint, rubber, gas and oils.
I previously owned an early model 2013 BRZ Premium which did not exhibit this heating problem either. On a cool day with the vent-only fan on you should get outside ambient air, on ANY car, not preheated air.
The only equipment functioning difference I see between my 2013 BRZ Pre and my 2015 FRS One is that when the car is first started and the fan turned ON, the FRS defaults to recirculation setting every time, whereas my BZR did not. I had to turn recirculation on manually on the BRZ, which is fine because that is only used with Air conditioning anyway because it is more efficient that way.
I suspect a defect in the heater ducting linkage not fully closing the flap, or the electronics that operate that.
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