Mercedes-Benz G-Class 2022 Operator's Manual page 137

134 Climate control
▌Adjusting the rear air vents
To open or close: hold the centre of air
#
vent 1 and turn it to the left or right as far as
it will go.
To set the airflow direction: hold the centre of
#
air vent 1 and move it up or down or to the
left or right.