Mercedes-Benz GLA Series Operator's Manual page 133

To open or close: hold air vent
#
center and turn it counter clockwise (open)
or clockwise (closed) as far as it will go.
To set the airflow direction: hold air
#
vent 1 in the center and move it up or down
or to the left or right.
Adjusting the rear air vents
1 in the
To open or close: hold air vent
#
center and turn it to the left (open) or right
(closed) as far as it will go.
To set the airflow direction: hold air
#
vent 1 in the center and move it up or down
or to the left or right.
1 in the
Climate control 131