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The heaters heat the bottom and back. The "ventillated" seats are just a fan in the seat bottom. What a joke - as soon as you sit in the seat and compress the foam cushion, it prevents any air flow through the cushion and on to the occupant!
My ventilated seats work well. Nothing to complain about. If I forget them on, I know because I can feel the cool air after the ac gets to temp. On a hot day, my driver seat with ventilation active is cool while my empty passenger seat is still hot, vent off..