2008 MERCEDES-BENZ GL450 steering

485 Practical hints
What to do if …
Display symbolDisplay messagePossible cause/consequencePossible solution
HTire Pressure
Check TiresThe tire pressure in one or more tires is
already below the minimum value.Carefully bring the vehicle to a halt, avoid-
ing abrupt steering and braking maneuvers.
Check and adjust tire pressure as required
(
page 395).
If necessary, change the wheel
(
page 519).
Check TiresThe tire pressure in one or more tires is
already below the minimum value.
Vehicles with Advanced TPMS*:
The respective tire is indicated in the
multifunction display.Carefully bring the vehicle to a halt, avoid-
ing abrupt steering and braking maneuvers.
Check and adjust tire pressure as required
(
page 395).
If necessary, change the wheel
(
page 519).
Warning!G
Do not drive with a flat tire. A flat tire affects
the ability to steer or brake the vehicle.
You may lose control of the vehicle. Contin-
ued driving with a flat tire will cause exces-
sive heat build-up and possibly a fire.
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519 Practical hints
Flat tire
Flat tire
Preparing the vehicle
Make sure the vehicle level is set to
highway (
page 279).
Park the vehicle in a safe distance from
moving traffic on a hard, flat surface
when possible.
Turn on the hazard warning flasher
(
page 149).
Turn the steering wheel so that the
front wheels are in a straight-ahead
position.
Set the parking brake (page 59).
Set the automatic transmission to park
positionP (
page 191).
Turn off the engine (page 41).
Have any passenger exit the vehicle at
a safe distance from the roadway.
Vehicles with SmartKey: Remove the
SmartKey from the starter switch.
Vehicles with KEYLESS-GO*: Open the
driver’s door (this puts the starter
switch in position0, same as with the
SmartKey removed from the starter
switch). The driver’s door then can be
closed again.
Remove the KEYLESS-GO*
start/stop button from the starter
switch.
Warning!G
The dimensions of the Minispare wheel are
different from those of the road wheels. As
a result, the vehicle handling characteristics
change when driving with a Minispare wheel
mounted. Adapt your driving style accord-
ingly.
The Minispare wheel is for temporary use
only. When driving with a Minispare wheel
mounted, ensure proper tire pressure and
do not exceed a vehicle speed of
50 mph (80 km/h).
Drive to the nearest Mercedes-Benz Light
Truck Center as soon as possible to have the
Minispare wheel replaced with a regular
road wheel.
Never operate the vehicle with more than
one spare wheel mounted.
Do not switch off the ESP
® when a
Minispare wheel is mounted.
Warning!G
Your vehicle is equipped with air suspen-
sion. Do not open or close any doors or the
tailgate while mounting a spare wheel. The
vehicle could rise or lower to a previously se-
lected level. You or others could be injured
as a result.
iOpen door only when conditions are safe to
do so.
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539 Practical hints
Towing the vehicle
If you want the gear position to remain in
neutral positionN, observe the following
instructions.Vehicles with SmartKey:
With the vehicle at a standstill and the
ignition switched on shift the automatic
transmission to neutral positionN.
If engaged, release the parking brake
(
page 59).
Switch off the ignition and leave the
SmartKey in the starter switch.
Vehicles with KEYLESS-GO*:
With the vehicle at a standstill, depress
the brake pedal and keep it pressed.
With the ignition switched on shift the
automatic transmission to park
positionP.
Release the brake pedal.
Warning!G
With the engine not running, there is no
power assistance for the brake and steering
systems. In this case, it is important to keep
in mind that a considerably higher degree of
effort is necessary to brake and steer the
vehicle. Adapt your driving accordingly.
!When towing the vehicle with all wheels on
the ground, the automatic transmission must be
in neutral positionN.
If you turn off the engine

using the SmartKey and

remove the SmartKey from the starter
switch
or

open a front door

or when using the KEYLESS-GO* start/stop
button and open a front door
the automatic transmission will shift to park
positionP automatically.
Warning!G
When leaving the SmartKey or SmartKey
with KEYLESS-GO* in the starter switch, do
not leave children unattended in the vehicle.
It is possible for children to switch on the
ignition which could result in unsupervised
use of vehicle equipment.
A child’s unsupervised access to a vehicle
could result in an accident and/or serious
personal injury.

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552 Technical data
Layout of poly-V-belt drive
GL 320 CDI
1Coolant pump
2Idler pulley
3Automatic belt tensioner
4Power steering pump
5Air conditioning compressor
6Crankshaft
7Idler pulley
8Generator (alternator)GL 450, GL 550
1Idler pulley
2Idler pulley
3Automatic belt tensioner
4Power steering pump
5Air conditioning compressor
6Crankshaft
7Coolant pump
8Generator (alternator)
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562 Technical data
Fuels, coolants, lubricants
Capacities
Vehicle components and their respective
lubricants must match. Therefore only use
products tested and approved by
Mercerdes-Benz.
Please refer to the Factory Approved
Service Products pamphlet (USA only), or
inquire at an authorized Mercedes-Benz
Light Truck Center.
Warning!G
Comply with all valid regulations with re-
spect to handling, storing and disposing of
service fluids. Otherwise you could
endanger persons or the environment.
Keep service fluids out of the reach of
children.
For health reasons, you should prevent
service fluids from coming into direct
contact with your skin or clothing.
If a service fluid is swallowed, contact a
physician immediately.
ModelCapacityFuels, coolants, lubricants, etc.
Engine with oil filterGL 320 CDI9.0 US qt (8.5 l)Approved engine oils
GL 450, GL 5509.5 US qt (9.0 l)Approved engine oils
Automatic transmissionAll models9.5 US qt (9.0 l)MB Automatic Transmission Fluid
Transfer case single speedAll models0.5 US qt (0.5 l)MB Automatic Transmission Fluid
Transfer case double speed*All models1.6 US qt (1.5 l)MB Automatic Transmission Fluid
Front axleAll models1.2 US qt (1.1 l)Hypoid gear oil
Rear axleAll models1.2 US qt (1.1 l)Hypoid gear oil
Rear axle with differential lock*All models1.7 US qt (1.6 l)Hypoid gear oil
Power steeringAll modelsapprox. 1.3 US qt (1.2 l)MB Power Steering Fluid or approved
Dexron III ATF
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572 Index
Automatic climate control (3-zone)* 228
Air conditioning refrigerant 563
Air conditioning, Cooling 239, 240
Air distribution, Front 234
Air distribution, Rear 243
Air recirculation mode 237
Air vents*, second-row seats 245
Air vents*, third-row seats 245
Air vents, Front 234
Air volume 235
Control panel, Front 230
Control panel, Rear 241
Deactivating system 232
Defogging 235
Defrosting 235
Maximum cooling, MAXCOOL 237
Rear passenger compartment 241
Rear window defroster 212
Residual engine heat (REST) 241
Using driver-side settings for
all temperature zones 240Automatic headlamp mode 144
Automatic lighting control, Interior
lighting 150
Automatic locking when driving 128
Automatic transmission 56
Accelerator position 195
Emergency operation
(limp-home mode) 200
Gear ranges 197
Gear selector lever 56, 189
Gear selector lever position 192
Gear shifting malfunctions 200
Hill start assist system 196
Kickdown 196
Shifting procedure 192
Starting the engine 56
Steering wheel gearshift control 198
Towing a trailer 197
Transmission fluid level 381
Transmission positions 193
Automatic Transmission Fluid see ATFB
Backrest
Seat 46
Seat, Lumbar support 137
Seat, Multicontour* 138
Backup lamps
Messages in the multifunction
display 477
Replacing bulbs 511
Bar 416
BAS 103
Lamps in instrument cluster 436
Messages in the multifunction
display 451
Batteries, SmartKey
Check lamp 112, 115
Checking battery condition 120
Messages in the multifunction
display 466
Replacing 502
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574 Index
Children in the vehicle 91
Air bags 77, 91
Blocking rear door window
operation 98
Indicator lamp, Front passenger front
air bag 85
Infant and child restraint systems 86,
92
LATCH-type child seat anchors 95
Occupant Classification System
(OCS) 81
Cigarette lighter
(Depending on vehicle
configuration) 323
Climate control 214
Air conditioning refrigerant 563
Air conditioning, Cooling 224, 225
Air distribution, Front 219
Air distribution, rear 227
Air recirculation mode 222
Air vents*, second-row seats 220
Air vents, Front 220
Air volume 220
Control panel*, Rear 226
Control panel, Front 216
Deactivating system 218Defogging 222
Defrosting 221
Rear window defroster 212
Residual engine heat (REST) 225
Clock 27, 174
Cloth upholstery, Cleaning and
care of 434
Cockpit 24
Cockpit Management and Data System
see COMAND System
Cold tire inflation pressure 416
Collapsible wheel chock 494
COMAND System see separate operating
instructions
Combination switch 61, 62, 64, 147
Compass 344
Adjustment 178
Calibration 179
Calling up the compass 344
Control and operation of radio
transmitters 370
Control system 155
Multifunction display 155
Multifunction steering wheel 156
Resetting to factory default 169Control system menus 155
AUDIO 164
DISTRONIC* (Canada only) 167
NAV* 166
Off-road 166
Settings 168
Standard display 162
TEL* 186
Trip computer 184
Vehicle configuration 182
Vehicle status message memory 167
Control system submenus 159, 161, 171
Comfort* 181
Instrument cluster 172, 173
Lighting 175
Time/Date 174
Vehicle 178
Coolant 381, 567
Anticorrosion/antifreeze mixing ratio
and quantity 568
Capacities 562
Checking coolant level 376, 381
Messages in the multifunction
display 470, 472
Temperature 372
Temperature display 162
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578 Index
ETD 89, 446
Safety guidelines 78
Expanding cargo compartment 304
Exterior rear view mirrors 51, 208
Folding 210
Power folding* 209
Synchronizing 209
F
Fastening the seat belts 53
Filler neck, Engine oil 381
First aid kit 490
Flat tire 519
Lifting the vehicle 520
Lowering the vehicle 526
Minispare wheel 494
Mounting the spare wheel 520
Preparing the vehicle 520
Floormats 325Fluids
Automatic transmission fluid 381,
562
Brake fluid 377, 563, 564
Capacities 562
Engine coolant 377, 381, 563, 567
Engine oil 380, 562, 564
Power steering fluid 562
Windshield washer and headlamp
cleaning system* 377, 569
Fog lamps 146
Corner-illuminating front fog
lamps* 147
Messages in the multifunction
display 478
Rear fog lamp 146
Replacing bulbs 510
4-ETS 107
Off-road - 4-ETS 108
Front air bags 79
Front defroster 221, 235
Front lamps see Headlamps
Front passenger front air bag 74, 79
Messages in the multifunction
display 460, 461, 462, 463Front passenger front air bag off indicator
lamp 31, 32, 85
Front seat head restraints see
Head restraints
Front towing eye 540
Fuel 375, 563
Additives 566
Capacities, Fuel tank 563
Consumption statistics 184, 185
Filling the tank 374
Fuel filler flap and cap 374, 497
Fuel gauge 29
Fuel tank reserve warning lamp 29,
446
Premium unleaded gasoline 375,
563, 565
Requirements, Octane rating 565
Fuel cap
Messages in the multifunction
display 474
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