Mercedes-Benz ML320. Service manual - part 77

135

Controls in detail

Automatic climate control

Automatic climate control panel in the front

Item

1 Thumbwheel for center air vent
2 Center air vent, adjustable
3 Defroster air vent windshield
4 Thumbwheels for side air vent
5 Side air vent, adjustable
6 Footwell air vent
7 Automatic climate control

Item

1 Air volume control
2 Defrosting
3 Air recirculation
4 Temperature control
5 Automatic control (temperature, air 

distribution, air volume)

6 AC cooling on/off (AC

OFF

)

Residual heat /ventilation (REST)

7 Interior temperature sensor
8 Air distribution control
9 Rear window defroster
a Rear passenger compartment venti-

lation on/off

136

Controls in detail

Automatic climate control

The automatic climate control is operatio-
nal whenever the engine is running. You 
can operate the climate control system in 
either the automatic or manual mode. The 
system cools or heats the interior depend-
ing on the selected interior temperature 
and the current outside temperature.

Nearly all dust particles, pollutants and 
odors are filtered out before outside air en-
ters the passenger compartment through 
the air distribution system.

Warning!

G

When operating the automatic climate con-
trol, the air that enters the passenger com-
partment through the air vents in the 
footwell can be very hot or very cold (de-
pending on the set temperature). This may 
cause burns or frostbite on unprotected skin 
in the immediate area of the air vents.

Always keep sufficient distance between un-
protected parts of the body and the footwell 
air vents. If necessary, change the air flow 
using the air distribution controls to direct 
the air away from the footwell air vents 
(

컄

page 138).

Warning!

G

Follow the recommended settings for heat-
ing and cooling given on the following pag-
es. Otherwise the windows could fog up, 
impairing visibility and endangering you and 
others.

i

Severe conditions (e.g. strong air pollu-
tion) may require replacement of the fil-
ter before its scheduled interval. A 
clogged filter will reduce the air volume 
to the interior.

If the vehicle interior is hot, ventilate 
the interior before driving off.

Keep the air intake grille in front of the 
windshield free of snow and debris.

Do not touch the interior temperature 
sensor to maintain a precise tempera-
ture.

The set value is indicated by a lighted 
segment on the control wheels.

137

Controls in detail

Automatic climate control

Automatic mode

Switching on

왘

Briefly press button

U  

(

컄

page 135).

The indicator lamp comes on. The tem-
perature, air volume and distribution 
are controlled automatically.

왘

Adjust the temperature with the tem-
perature control 4 (

컄

page 135).

Temperature control is switched off in 
the extreme position (blue or red dot).

Switching off

왘

Briefly press button

U  

(

컄

page 135).

The indicator lamp goes out. The auto-
matic mode is switched off.

Air volume control 1 is set to fan 
speed 2 and air distribution is set 
to

V.

Activating basic setting

왘

Press button

U at least 

three seconds.

All functions are switched to automatic 
mode and temperature is set to 72°F 
(22°C).

Changing basic setting

왘

Set temperature control 4 
(

컄

page 135) to desired temperature.

왘

Press button

U for ten seconds.

The selected temperature value is 
stored and set.

Adjusting air volume and air distribu-
tion manually

Adjusting air volume

왘

Turn air volume control 1 to one of 
five air volume settings.

i

Adjust temperature settings in small 
increments.

i

If you turn air volume control 1 or air 
distribution control 8 (

컄

page 135), 

the automatic mode switches off. The 
indicator lamp in the button

U goes 

out. The temperature control will still 
be in automatic mode.

i

When set to 0 the system is fully deac-
tivated and no fresh air is supplied. This 
setting should only be selected for 
short periods of time.

138

Controls in detail

Automatic climate control

Adjusting air distribution

왘

Turn air distribution control 8 
(

컄

page 135) to one the following 

symbols:

Windshield fogged on the outside

왘

Switch the windshield wipers on, 
(

컄

page 50).

왘

Turn air distribution control 8 to h 
or

k.

Defrosting

Activating

왘

Press button

P (

컄

page 135).

The indicator lamp on the button 
comes on.

Deactivating

왘

Press button

P again.

or

왘

Press button

U (

컄

page 135).

The indicator lamp on the button

P 

goes out.

Air recirculation mode

Switch to air recirculation mode to prevent 
unpleasant odors from entering the vehicle 
from the outside. This setting cuts off the 
intake of outside air and recirculates the 
air in the passenger compartment.

Symbol

Function

h

Directs air to the center 
and side air vents

j

Directs air to the wind-
shield and side air vents

V

Directs air into the en-
tire vehicle interior

k

Directs air to the foot-
wells and side air vents

i

These settings should only be selected 
for a short time.

When the defrost setting has been se-
lected, only the rear window defroster 
can be switched on. No other settings 
are possible.

Warning!

G

When the outside temperature is below 
41°F (5°C), only switch to air recirculation 
mode for short periods to prevent window 
fogging.