Toyota 2015 Prius Owner's Manual page 359

3-1. Using the air conditioning system and defogger
Opening and closing the air outlets
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Center outlets
Right and left side outlets
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Open the vent.
Close the vent.
Move the knob in the direction of
the printed arrow until a click is
heard.
Open the vent.
Close the vent.
Move the knob in the direction of
the printed arrow until a click is
heard.