2007 MERCEDES-BENZ GL450 cooling

Contents
Control system .................................. 157
Multifunction display .................... 157
Multifunction steering wheel ........ 158
Menus .......................................... 160
Standard display menu ................ 164
Audio menu .................................. 166
NAV* menu .................................. 168
Off-road menu .............................. 168
DISTRONIC* menu ....................... 169
Vehicle status message
memory menu .............................. 169
Settings menu .............................. 170
Vehicle configuration ................... 185
Trip computer menu..................... 187
TEL* menu ................................... 189
Automatic transmission ..................... 192
Gear selector lever ....................... 192
Shifting procedure ....................... 195
Transmission positions................. 195
Driving tips ................................... 198
Gear ranges ................................. 200
Steering wheel gearshift control .. 201
Emergency operation
(Limp-Home Mode) ...................... 202
Transfer case ..................................... 203
LOW RANGE mode* ..................... 203Differential locks* .............................. 206
A few words about differentials
and differential locks* .................. 206
Switching differential locks* ......... 207
Good visibility ..................................... 210
Headlamp cleaning system* ......... 210
Rear view mirrors.......................... 210
Power folding exterior
rear view mirrors*......................... 211
Sun visors ..................................... 213
Rear panorama roof sunshade ...... 214
Rear window defroster .................. 215
Climate control ................................... 216
Deactivating the
climate control system ................. 220
Operating the climate control
system in automatic mode............ 220
Setting the temperature................ 221
Adjusting air distribution............... 221
Adjusting air volume ..................... 222
Air vents in the roof liner
over the second-row seats* .......... 222
Front defroster.............................. 223
Air recirculation mode .................. 224
Air conditioning............................. 226
Residual heat and ventilation ........ 227Rear climate control* ................... 228
3-zone automatic climate control* ..... 230
Deactivating the automatic
climate control system ................. 234
Operating the automatic
climate control system
in automatic mode ........................ 235
Setting the temperature ............... 235
Adjusting air distribution .............. 236
Adjusting air volume ..................... 237
Front defroster ............................. 237
Maximum cooling MAXCOOL ........ 239
Air recirculation mode .................. 239
Air conditioning ............................ 241
Using driver-side settings
for all temperature zones.............. 242
Residual heat and ventilation ........ 242
Rear automatic climate control..... 243
Power windows .................................. 248
Opening and closing ..................... 248
Synchronizing the door windows .. 251
Summer opening feature .............. 251
Convenience closing feature......... 252

67 Getting started
Driving
The coolant temperature is above
248°F (120°C)
The coolant is too hot and is no longer
cooling the engine.
Stop the vehicle in a safe location as
soon as possible and turn off the en-
gine. Allow engine and coolant to cool
off.
Check the coolant level and add cool-
ant if necessary (
page 382).In case of accident
If the vehicle is leaking fuel:
Do not start the engine under any
circumstances.
Notify local fire and/or police authori-
ties.
If the extent of the damage cannot be de-
termined:
Contact an authorized Mercedes-Benz
Light Truck Center or call Roadside
Assistance.
If no damage can be determined on the

major assemblies

fuel system

engine mount:
Start the engine in the usual manner.

218 Controls in detail
Climate control
1Temperature control, left
2Air distribution and air volume
(automatic, manual)
3Front defroster
0
or, depending on vehicle production
date,
|
4Increasing air volume
5Air distribution (directs air through
the windshield and side air vents)
6Rear climate control* on/off
Air supply for rear passenger
compartment on/off
:USA only
7Temperature control, right
8AC cooling on/off
Residual heat/ventilation
9Air distribution (directs air through
center and side air vents)
aAir distribution (directs air through
the footwells and side air vents)
bAir volume display
cDecreasing air volume
dRear window defroster
eAir recirculation
fInterior temperature sensor
gClimate control on/off

219 Controls in detail
Climate control
The climate control is operational whenev-
er 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 depending 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.
The air conditioning will not engage (no
cooling) if the A/C mode is deactivated
(
page 226).
Warning!G
When operating the climate control, the air
that enters the passenger compartment
through the air vents can be very hot or very
cold (depending on the set temperature).
This may cause burns or frostbite to unpro-
tected skin in the immediate area of the air
vents.
Always keep sufficient distance between un-
protected parts of the body and the air
vents. If necessary, use the air distribution
controls (
page 218) to direct the air to air
vents in the vehicle interior that are not in
the immediate area of unprotected skin.
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.
iSevere conditions (e.g. strong air pollution)
may require replacement of the filter 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, see “Summer opening fea-
ture” (
page 251). The climate control will then
adjust the interior temperature to the set value
much faster.
Keep the air intake grille in front of the wind-
shield free of snow and debris.

220 Controls in detail
Climate control
Deactivating the climate control
system
Deactivating
Press button´ (page 218).
The indicator lamp on the button
comes on.Reactivating
Press buttonU (page 218).
Operating the climate control system
in automatic modeActivating
Press buttonU (page 218) while
the engine is running.
The indicator lamp on the button
comes on. The air volume and air distri-
bution are adjusted automatically.
Use temperature controls1 and7
(
page 218) to separately adjust the
air temperature on each side of the
passenger compartment.
The interior air temperature is adjusted
automatically.
Deactivating
Press button
orQ
(
page 218).
The indicator lamp on buttonU
goes out. The automatic operation of
air volume switches off. The selected
blower speed is shown in the air
volume displayb (
page 218).
Warning!G
When the climate control system is
switched off, the outside air supply and cir-
culation are also switched off. Only choose
this settings for a short time. Otherwise the
windows could fog up, impairing visibility
and endangering you and others.
iYou can also press button´
(
page 218) on the climate control panel.
If you press button0 or, depending on vehi-
cle production date, button|(
page 218)
to reactivate the climate control system, the
defrosting mode is activated.
iWhen operating the climate control system
in automatic mode, you will only rarely need to
adjust the temperature, air volume and air distri-
bution.
In automatic mode, cooling with dehumidify is
switched on. This function can be switched off if
necessary (
page 227).
iThe settings for the passenger side are also
used for the rear passenger compartment.

226 Controls in detail
Climate control
Convenience closing
Press button: for approximately
2 seconds.
The windows and/or tilt/sliding sun-
roof* will close. You can release
button: once the closing proce-
dure has begun. The windows and
tilt/sliding sunroof* continue closing
until they are fully closed. The indicator
lamp on the button comes on. The air
recirculation mode is activated.Convenience opening
Press button: for approximately
2 seconds.
The windows and/or tilt/sliding sun-
roof* will return to their previous posi-
tions. You can release button:
once the opening procedure has be-
gun. The windows and tilt/sliding sun-
roof* continue opening until they have
reached their previous positions. The
indicator lamp on the button goes out.
The air recirculation mode is deactivat-
ed.
Air conditioning
The air conditioning is operational while
the engine is running and cools the interior
air to the temperature set by the operator.
In addition, the air conditioning dehumidi-
fies the interior air at outside temperatures
above 41°F (5° C) and helps prevent
window fogging.The closing of the windows and the
tilt/sliding sunroof* can be reversed by
again pressing and holding the :button.
iA window or the tilt/sliding sunroof* will
only return to its previous position if it has not
been moved to another position using the re-
spective window switch or tilt/sliding sunroof*
switch after it was closed with button:.
iCondensation may drip out from underneath
the vehicle. This is normal and not an indication
of a malfunction.
Warning!G
If you turn off the cooling function, the
interior air is not dried. The windows can fog
up more quickly. Window fogging may
impair visibility and endanger you and
others.


227 Controls in detail
Climate control
Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the climate
control system. The air in the vehicle will
then no longer be cooled or dehumidified.
Press button9 (page 218).
The indicator lamp on the button goes
out.
Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condition-
ing.
Press button9 (page 218) again.
The indicator lamp on the button
comes on.
The air conditioning uses the refrigerant
R134a. This refrigerant is free of CFCs
which are harmful to the ozone layer.
Residual heat and ventilation
With the engine switched off, it is possible
to continue to heat or ventilate the interior
for up to 30 minutes. This feature makes
use of the residual heat produced by the
engine.Activating
Switch off the ignition (page 42).
Press button9 (page 218).
The indicator lamp on the button
comes on.
Deactivating
Press button9 (page 218).
The indicator lamp on the button goes
out.
!If the air conditioning cannot be turned on
again, this indicates that the air conditioning is
losing refrigerant. The compressor has turned
off.
Have the air conditioning checked at the nearest
authorized Mercedes-Benz Light Truck Center.
iHow long the system will provide heating
depends on

the coolant temperature

the battery voltage
Regardless of the temperature and air volume
set on the climate control panel, the interior tem-
perature is set to 72°F (22°C) and the blower
runs on low speed to protect the vehicle battery.
iThe residual heat is automatically turned off:

when the ignition is switched on

after about 30 minutes

if the coolant temperature is too low

if the battery voltage drops

228 Controls in detail
Climate control
Rear climate control*
The control panel is located on the rear of
the front center console.
Activating rear climate control
Press buttonU.
The indicator lamp on the button
comes on. The air volume and air distri-
bution are adjusted automatically.Deactivating rear climate control
Press button´.
The indicator lamp on the button
comes on.
The cooling function switches off after
a short delay.iThe rear climate control panel is only
available if your vehicle is equipped with seat
heating* for the rear seats or Rear Audio fea-
ture* (see separate COMAND System operating
instructions).
1Left rear center air vent, adjustable
2Right rear center air vent, adjustable
3Rear climate control on
(automatic mode)
4Air distribution (directs air through
the center air vents)
5Air distribution (directs air through
the footwells and side air vents)
6Rear air conditioning off
iThe climate control must be switched on
(
page 229).
iThe temperature is adjusted according to
the settings for the front passenger side made
on the front climate control panel (
page 221).
iSwitch off the rear climate control for im-
proved cooling or heating output in the front pas-
senger compartment.
You can also switch off the rear climate control
from the front passenger compartment
(
page 229).