Chevrolet Captiva Owner's Manual page 152

7-10 Climate Controls
Side Vents
You can direct air through both
adjustable side vents toward either side
of the front passenger area, or toward
the side windows.
Centre Vents
You can control the direction of airflow
through both adjustable centre vents.
To Shut Off the Centre Vents and the
Side Vents
Turn the wheel below or next to each
vent outlet to block the airflow through
the vents.
Warning
Do not attach any objects to the slats
of the air vents. Risk of damage and
injury in case of an accident.