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It should blow through the floor vents. Modern vehicles generally use movable baffles in there HVAC systems, to direct air flow where the controls indicate. If the controls allow airflow to the floor, but nothing flows out, there is a malfunction between the control switch and the actuator that directs the flow.

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Q: Why would the ac and heater blow air through the defroster or the dashboard vents but not through the floor vents.?
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