Mercedes-Benz GLS 2020 Operator's Manual page 153

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 adjust the air direction: hold air vent
#
in the center and move it up or down or to
the left or right.
Adjusting the rear air vents
To open or close: turn controller
#
left or right as far as it will go.
To adjust the air direction: hold air vent
#
in the center and move it up or down or to
the left or right.
1 in the
1
2 to the
1
Climate control 151