heating MERCEDES-BENZ GLS 2019 User Guide

0087
Switches the maximum cooling MAX COOL on or off (Y page 134)
0085 Switches cooling with air dehumidification on/off (Y page 131)
0083 Switches the rear window defroster on/off (Y page 134)
0084 Sets the temperature, right (Y page 132)
006B Switches air-recirculation mode on/off (Y page 135)
006C Sets the air distribution (Y page 133)
006D Increases the airflow (Y page 133)
006E Reduces the airflow (Y page 133)
006F Activates/deactivates climate control (Y page 131)
0070 Sets climate control to automatic (Y page 132)
Rear control panel
0071 Sets rear-compartment climate control to automatic (Y page 132)
0072 Directs the air distribution through the rear air vents (Y page 133)
0073 Switches the seat heating on the right-hand side on/off (Y page 106)
0074 Directs the air distribution through the footwell vents (Y page 133)
0075 Switches the rear climate control on/off (Y page 131)
0076 Switches the seat heating on the left-hand side on/off (Y page 106)Canada only
Front control panel
0043 Sets the temperature, left (Y page 132)
0044 Defrosts the windshield (Y page 133)
0087 Switches the ZONE function on/off (Y page 133)
0085 Switches cooling with air dehumidification on/off (Y page 131)
Switches the residual heat on or off (Y page 135)
0083 Switches the rear window defroster on/off (Y page 134)
0084 Sets the temperature, right (Y page 132)
006B Switches air-recirculation mode on/off (Y page 135)
006C Sets the air distribution (Y page 133)
006D Increases the airflow (Y page 133)
006E Reduces the airflow (Y page 133)
006F Activates/deactivates climate control (Y page 131)
0070 Sets climate control to automatic (Y page 132)126
Overview of climate control systemsClimate control

Rear control panel
0071 Sets rear-compartment climate control to automatic (Y page 132)
0072 Directs the air distribution through the rear air vents (Y page 133)
0073 Switches the seat heating on the right-hand side on/off (Y page 106)
0074 Directs the air distribution through the footwell vents (Y page 133)
0075 Switches the rear climate control on/off (Y page 131)
0076 Switches the seat heating on the left-hand side on/off (Y page 106)Control panel for 3-zone automatic climate control
USA only
Front control panel
0043 Sets the temperature, left (Y page 132)
0044 Defrosts the windshield (Y page 133)
0087 Switches the maximum cooling MAX COOL on or off (Y page 134)
0085 Switches cooling with air dehumidification on/off (Y page 131)
0083 Switches the rear window defroster on/off (Y page 134)
0084 Sets the temperature, right (Y page 132)
006B Switches the ZONE function on/off (Y page 133)
006C Activates/deactivates climate control (Y page 131)
006D Sets the air distribution (Y page 133)
006E Increases the airflow (Y page 133)
006F Reduces the airflow (Y page 133)
0070 Display
0071 Adjusts the climate mode settings (Y page 132)
0072 Switches air-recirculation mode on/off (Y page 135)
0073 Sets climate control to automatic (Y page 132)
Rear control panel
0074 Increases the airflow (Y page 133)
0075 Sets the temperature (Y page 132) Overview of climate control systems
127Climate control

0076
Sets rear-compartment climate control to automatic (Y page 132)
0077 Directs the airflow through the rear air vents (Y page 133)
0078 Switches the seat heating on the right-hand side on/off (Y page 106)
0079 Directs the airflow through the footwell vents (Y page 133)
007A Switches the rear climate control on/off (Y page 131)
007B Reduces the airflow (Y page 133)
007C Switches the seat heating on the left-hand side on/off (Y page 106)Canada only
Front control panel
0043 Sets the temperature, left (Y page 132)
0044 Defrosts the windshield (Y page 133)
0087 Switches the residual heat on or off (Y page 135)
0085 Switches cooling with air dehumidification on/off (Y page 131)
0083 Switches the rear window defroster on/off (Y page 134)
0084 Sets the temperature, right (Y page 132)
006B Switches the ZONE function on/off (Y page 133)
006C Activates/deactivates climate control (Y page 131)
006D Sets the air distribution (Y page 133)
006E Increases the airflow (Y page 133)
006F Reduces the airflow (Y page 133)
0070 Display
0071 Adjusts the climate mode settings (Y page 132)
0072 Switches air-recirculation mode on/off (Y page 135)
0073 Sets climate control to automatic (Y page 132)
Rear control panel
0074 Increases the airflow (Y page 133)
0075 Sets the temperature (Y page 132)
0076 Sets rear-compartment climate control to automatic (Y page 132)
0077 Directs the airflow through the rear air vents (Y page 133)
0078 Switches the seat heating on the right-hand side on/off (Y page 106)128
Overview of climate control systemsClimate control

0079
Directs the airflow through the footwell vents (Y page 133)
007A Switches the rear climate control on/off (Y page 131)
007B Reduces the airflow (Y page 133)
007C Switches the seat heating on the left-hand side on/off (Y page 106)Control panel for 3-zone automatic climate control with additional rear
passenger compartment climate control USA only
Front control panel
0043 Sets the temperature, left (Y page 132)
0044 Defrosts the windshield (Y page 133)
0087 Switches the maximum cooling MAX COOL on or off (Y page 134)
0085 Switches cooling with air dehumidification on/off (Y page 131)
Switches the residual heat on or off (Y page 135)
0083 Switches the rear window defroster on/off (Y page 134)
0084 Sets the temperature, right (Y page 132)
006B Switches the ZONE function on/off (Y page 133)
006C Switches the rear climate control on/off (Y page 131)
006D Sets the air distribution (Y page 133)
006E Increases the airflow (Y page 133)
006F Reduces the airflow (Y page 133)
Switches off climate control
0070 Display
0071 Adjusts the climate mode settings (Y page 132)
0072 Switches air-recirculation mode on/off (Y page 135)
0073 Sets climate control to automatic (Y page 132)
Rear control panel
0074 Increases the airflow (Y page 133)
0075 Sets the temperature (Y page 132) Overvie
w of climate cont rol systems
129Climate control

Problems with the rear window defroster
Problem
Possible causes/consequences and
0050
0050Solutions The rear window
defroster has deactiva-
ted prematurely or can-
not be activated. The battery has not been sufficiently charged.
X Switch off any consumers that are not required, e.g. reading lamps,
interior lighting or the seat heating.
When the battery is sufficiently charged, the rear window defroster can be activated again. Switching air-recirculation mode
on/off
General notes You can deactivate the flow of fresh air if
unpleasant odors are entering the vehicle from
outside. The air already inside the vehicle will
then be recirculated.
If you switch on air-recirculation mode, the win-
dows can fog up more quickly, in particular at
low temperatures. Only use air-recirculation
mode briefly to prevent the windows from fog-
ging up.
Activating/deactivating X
Turn the SmartKey to position 0048in the igni-
tion lock (Y page 140).
X To activate: press the0089button.
The indicator lamp in the 0089button lights
up.
i In the event of high pollution levels (3-zone
automatic climate control only) or at high out-
side temperatures, air-recirculation mode is
automatically activated. When air-recircula-
tion mode is activated automatically, the indi-
cator lamp in the 0089button is not lit.
Outside air is added after about 30 minutes.
X To deactivate: press the0089button.
The indicator lamp in the 0089button goes
out.
i Air-recirculation mode deactivates auto-
matically:
R after approximately five minutes at outside
temperatures below approximately 41 ‡
(5 †)
R after approximately five minutes if cooling
with air dehumidification is deactivated
R after approximately 30 minutes at outside
temperatures above approximately 41 ‡ (5 †) if the "Cooling with air dehumidifi-
cation" function is activated Switching the residual heat on or off
General notes The residual heat function is only available on
vehicles for Canada.
It is possible to make use of the residual heat of
the engine to continue heating the stationary
vehicle for up to 30 minutes after the engine has been switched off. The heating time depends on
the set interior temperature.
Activating/deactivating X
To activate: press the004Bor0056 button.
The indicator lamp in the 004Bor0056 button
lights up.
i The blower will run at a low speed regardless
of the airflow setting.
i If you activate the residual heat function at
high temperatures, only the ventilation will be
activated. The blower runs at medium speed.
X To deactivate: press the004Bor0056 but-
ton.
The indicator lamp in the 004Bor0056 button
goes out.
Residual heat is deactivated automatically:
R after approximately 30 minutes
R when the ignition is switched on
R if the battery voltage drops Ionization
Ionization is used to purify the air in the vehicle interior and attain an improved interior climate. Operating the climate control systems
135Climate control

The ionization of the interior air is odorless and
cannot be perceived directly in the vehicle inte- rior.
You can switch ionization on and off via the mul-
timedia system (see the Digital Operator's Man-
ual).
Ionization can only be operated when the auto-
matic climate control is switched on. The side air vent on the driver's side must be open. Setting the air vents
Important safety notes
G
WARNING
Very hot or very cold air can flow from the air vents. This could result in burns or frostbite in the immediate vicinity of the air vents. There
is a risk of injury.
Make sure that all vehicle occupants always
maintain a sufficient distance to the air out-
lets. If necessary, redirect the airflow to
another area of the vehicle interior.
In order to ensure the direct flow of fresh air
through the air vents into the vehicle interior,
please observe the following notes:
R keep the air inlet grille on the hood and in the
engine compartment on the front-passenger
side free of blockages, such as ice, snow or
leaves.
R never cover the air vents or air intake grilles in
the vehicle interior.
i For virtually draft-free ventilation, adjust the
sliders of the air vents to the center position. Setting the center air vents
0043
Center air vent, left
0044 Center air vent, right
0087 Center vent thumbwheel, right
0085 Center vent thumbwheel, left
X To open or close: turn thumbwheels0087
and 0085to the left or right. Setting the side air vents
Example
0043
Side window defroster vent
0044 Side air vent, left
0087 Thumbwheel for side air vent
X To open or close: turn thumbwheel0087up or
down. Setting the glove box air vent
! Close the air vent when heating the vehicle.
At high outside temperatures, open the air
vent and activate the "cooling with air dehu-
midification" function. Otherwise, tempera-
ture-sensitive items stored in the glove box
could be damaged. 136
Setting the air ventsClimate control

Problems with the transmission
Problem
Possible causes/consequences and
0050
0050Solutions The transmission has
problems shifting gear. The transmission is losing oil.
X Have the transmission checked at a qualified specialist workshop
immediately. 7G-TRONIC:
The acceleration ability
is deteriorating.
The transmission no lon-
ger changes gear. The transmission is in emergency mode.
It is only possible to shift into
secondgear and reverse gear.
X Stop the vehicle.
X Shift the transmission to position 005D.
X Switch off the engine.
X Wait at least ten seconds before restarting the engine.
X Shift the transmission to position 005Bor005E.
If 005B is selected, the transmission shifts to secondgear; if005Eis
selected, the transmission shifts to reverse gear.
X Have the transmission checked at a qualified specialist workshop
immediately. 9G-TRONIC:
The acceleration ability
is deteriorating.
The transmission no lon-
ger changes gear. The transmission is in emergency mode.
It is only partly possible to engage the gears, or the transmission is in
position 005C.
X Stop the vehicle.
X Shift the transmission to position 005D.
X Switch off the engine.
X Wait at least ten seconds before restarting the engine.
X Shift the transmission to position 005Bor005E.
X Have the transmission checked at a qualified specialist workshop
immediately. Transfer case
This section is only valid for vehicles with 4-
wheel drive (4MATIC). Power is always trans-
mitted to both axles.
! Performance tests may only be carried out
on a 2-axle dynamometer. The brake system
or transfer case could otherwise be damaged. Contact a qualified specialist workshop for a
performance test.
! Because ESP ®
is an automatic system, the
engine and ignition must be switched off
(SmartKey in position 0or 1or Start/Stop
button in position 0or 1) when the electric
parking brake is being tested on a brake dyna-
mometer (maximum 10 seconds).
Braking triggered automatically by ESP ®
may
seriously damage the brake system. !
Vehicles with 4MATIC must not be towed
with either the front or the rear axle raised, as
doing so will damage the transmission. Refueling
Important safety notes
G
WARNING
Fuel is highly flammable. Risk of fire and
explosion by improper handling of fuel.
You must avoid fire, open flames, smoking
and creating sparks. Switch off the ignition
before refueling and, if present, switch off the auxiliary heating. Refueling
155Driving and parking Z

In addition to driving style, the actual consump-
tion is affected by other factors, such as:
R load
R tire pressure
R cold start
R choice of route
R electrical consumers switched on
These factors are not included in the ECO dis-
play.
An economical driving style specially requires
driving at moderate engine speeds.
Achieving a higher value in the categories
"Acceleration" and "Constant":
R observe the gearshift recommendations.
R drive the vehicle in the Comfortdrive pro-
gram.
On long journeys at a constant speed, e.g. on the highway, only the outer area for "constant" will
change.
The ECO display summarizes the driving style
from the start of the journey to its completion.
Therefore, there are more marked changes in
the outer areas at the start of a journey. On lon-
ger journeys, there are fewer changes. For more
marked changes, perform a manual rest
(Y page 234).
For further information on the ECO display, see (Y page 234). Braking
Important safety notes G
WARNING
If you shift down on a slippery road surface in an attempt to increase the engine's braking
effect, the drive wheels could lose their grip.
There is an increased danger of skidding and
accidents.
Do not shift down for additional engine brak-
ing on a slippery road surface.
Downhill gradients !
On long and steep gradients, you must
reduce the load on the brakes by shifting to a
lower gear in good time. This allows you to
take advantage of the engine's braking effect. This helps you to avoid overheating the
brakes and wearing them out excessively.
When you take advantage of engine braking, a
drive wheel may not turn for some time, e.g.
on a slippery road surface. This could cause
damage to the drive train. This type of damage
is not covered by the Mercedes-Benz war-
ranty.
Do not depress the brake pedal continuously
while the vehicle is in motion, e.g. causing the
brakes to rub by constantly applying light pres-
sure to the pedal. This results in excessive and
premature wear to the brake pads.
Use the left-hand steering wheel paddle shifter
to shift into a lower gear in good time on long
and steep downhill gradients. This is especially
important if the vehicle is laden.
This also applies if you have activated cruise
control, the limiter or Active Distance Assist
DISTRONIC.
This will use the braking effect of the engine, so that less braking will be required to maintain the
speed. This relieves the load on the brake sys-
tem and prevents the brakes from overheating
and wearing too quickly.
Heavy and light loads G
WARNING
If you rest your foot on the brake pedal while
driving, the braking system can overheat. This increases the stopping distance and can even
cause the braking system to fail. There is a
risk of an accident.
Never use the brake pedal as a footrest. Never
depress the brake pedal and the accelerator
pedal at the same time.
! Depressing the brake pedal constantly
results in excessive and premature wear to
the brake pads.
If the brakes have been subjected to a heavy
load, do not stop the vehicle immediately. Drive on for a short while. This allows the airflow to
cool the brakes more quickly.
Wet roads If you have driven for a long time in heavy rain
without braking, there may be a delayed reac-
tion from the brakes when braking for the first Driving tips
163Driving and parking Z

such as carbon monoxide (CO) may enter the
vehicle. This is the case, e.g. if the vehicle
becomes trapped in snow. There is a risk of
fatal injury.
If you leave the engine or the auxiliary heating
running, make sure the exhaust pipe and area
around the vehicle are clear of snow. To
ensure an adequate supply of fresh air, open a window on the side of the vehicle that is not
facing into the wind.
! When scraping ice off the rear window, take
care not to damage the rear-window seal or
trim.
Have your vehicle winter-proofed at a qualified
specialist workshop at the onset of winter.
Drive particularly carefully on slippery road sur- faces. Avoid sudden acceleration, steering and
braking maneuvers. Do not use cruise control or
Active Distance Assist DISTRONIC.
If the vehicle threatens to skid or cannot be
stopped when moving at low speed:
X Shift the transmission to position 005C.
X Try to bring the vehicle under control using
corrective steering.
When driving in snow with or without snow
chains, select driving program Slippery
(Y page 147).
The outside temperature indicator is not
designed to serve as an ice-warning device and
is therefore unsuitable for that purpose.
Changes in the outside temperature are dis-
played after a short delay.
Indicated temperatures just above the freezing
point do not guarantee that the road surface is
free of ice. The road may still be icy, especially in wooded areas or on bridges. You should pay
special attention to road conditions when tem-
peratures are around the freezing point.
For more information on driving with snow
chains, see (Y page 354).
For more information on driving with summer
tires, see (Y page 354).
Observe the notes in the "Changing a wheel"
section (Y page 372). Off-road driving
Important safety notes G
WARNING
If you drive on a steep incline at an angle or
turn when driving on an incline, the vehicle
could slip sideways, tip and rollover. There is a risk of an accident.
Always drive on a steep incline in the line of
fall (straight up or down) and do not turn the
vehicle. G
WARNING
Flammable material such as leaves, grass or
twigs may ignite if they come into contact with hot parts of the exhaust system. There is a risk of fire.
When driving on an unpaved road or off-road,
check the vehicle underside regularly. In par-
ticular, remove trapped plant parts or other
flammable material. Contact a qualified spe-
cialist workshop immediately if damage is
detected. G
WARNING
If the vehicle level is high, the vehicle center of gravity is raised. This could cause the vehicleto tip over more easily on uphill or downhill
gradients. There is a risk of an accident.
Select the lowest possible vehicle level.
! There is a risk of damage to the vehicle if:
R the vehicle becomes stuck, e.g. on a high
curb or an unpaved road
R you drive too fast over an obstacle, e.g. a
curb, a speed bump or a pothole in the road
R a heavy object strikes the underbody or
parts of the chassis
In situations like this, the body, the under-
body, chassis parts, wheels or tires could be
damaged without the damage being visible.
Components damaged in this way can unex-
pectedly fail or, in the case of an accident, no
longer withstand the loads they are designed
to.
If the underbody paneling is damaged, com-
bustible materials such as leaves, grass or 166
Driving tipsDriving and parking

Further information on driving safety systems
(Y page 66). Cruise control
General notes Cruise control maintains a constant road speed
for you. It brakes automatically in order to avoid exceeding the set speed. You must select a
lower gear in good time on long and steep down-
hill gradients, especially if the vehicle is laden or towing a trailer. By doing so, you will make use of
the braking effect of the engine. This relieves the
load on the brake system and prevents the
brakes from overheating and wearing too
quickly.
Use cruise control only if road and traffic con-
ditions make it appropriate to maintain a steady speed for a prolonged period. You can store anyroad speed above 20 mph (30 km/h).
i Cruise control should not be activated when
driving off-road.
Important safety notes If you fail to adapt your driving style, cruise con-
trol can neither reduce the risk of an accident
nor override the laws of physics. Cruise control
cannot take into account the road, traffic and
weather conditions. Cruise control is only an
aid. You are responsible for the distance to the
vehicle in front, for vehicle speed, for braking in
good time and for staying in your lane.
Do not use cruise control:
R in road and traffic conditions which do not
allow you to maintain a constant speed, e.g. in
heavy traffic or on winding roads
R on slippery road surfaces. Braking or accel-
erating could cause the drive wheels to lose
traction and the vehicle could then skid
R when there is poor visibility, e.g. due to fog,
heavy rain or snow
If there is a change of drivers, advise the new
driver of the speed stored. Cruise control lever 0043
Activates or increases speed
0044 Activates or reduces speed
0087 Deactivates cruise control
0085 Activates at the current speed/last stored
speed
When you activate cruise control, the stored
speed is shown in the multifunction display for
five seconds.
Activation conditions To activate cruise control, all of the following
activation conditions must be fulfilled:
R the electric parking brake must be released.
R you are driving faster than 20 mph (30 km/h).
R ESP ®
must be active, but not intervening.
R the transmission must be in position 005B.
R DSR must be deactivated.
R the Offroad Plus drive program must be deac-
tivated (vehicles with the Off-road Engineer-
ing Package).
Storing, maintaining and calling up a
speed Storing and maintaining a speed
X Accelerate the vehicle to the desired speed.
X Briefly press the cruise control lever up 0043or
down 0085.
X Remove your foot from the accelerator pedal.
Cruise control is activated. The vehicle auto-
matically maintains the stored speed.
i Cruise control may be unable to maintain
the stored speed on uphill gradients. The
stored speed is resumed when the gradient
evens out. Cruise control maintains the Driving systems
171Driving and parking Z