Mercedes-Benz GL450 Operator's Manual page 243

Controls in detail
3-zone automatic climate control*
Air vents in the roof liner over the
second-row seats
1 Thumbwheel for air volume control
2 Air vent, adjustable
Adjusting air volume
Turn thumbwheel 1 down to decrease
the air volume.
or
Turn thumbwheel 1 up to increase the
air volume.
242
Adjusting air distribution
Move air vent slider 2 to the left, right,
up, or down to direct the air in the de-
sired direction.
Air vents in the roof liner over the
third-row seats*
1 Thumbwheel for air volume control
2 Air vent, adjustable
Adjusting air volume
Turn thumbwheel 1 down to decrease
the air volume.
or
Turn thumbwheel 1 up to increase the
air volume.
Adjusting air distribution
Move air vent slider 2 to the left, right,
up, or down to direct the air in the de-
sired direction.