climate settings MERCEDES-BENZ ML350 1997 Complete Repair Manual

301 Index
Te ch n ica l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car careIndex Brake fluid ............................................................. 175, 294
Brake warning lamp ................................................. 219
Capacity ......................................................................293
Brake pad wear indicator .............................................225
Brake warning lamp ...................................................... 219
Brake fluid low .......................................................... 219
Brakes ....................................................173, 175, 293, 294
CCapacities
Fuels, coolants, lubricants etc. ...............................292
Cargo area ....................................................................... 131
Hooks .......................................................................... 133
Loading instructions ................................................ 136
Cargo area cover blind .................................................. 137
Cargo compartment lamp .............................................. 111
Cargo floor plates
Removable .................................................................. 129
Storage ........................................................................ 130
Cargo tie-down rings ..................................................... 132
Catalytic converter ........................................................ 160
Cellular telephone ......................................................... 139
Center console .................................................................. 20
Central locking switch .................................................... 32Central locking system .................................................... 26
Automatic central locking .........................................32
Locking and unlocking ............................................... 27
Mechanical keys ..........................................................29
Panic button .................................................................28
Remote control ............................................................26
Unlocking the liftgate ................................................. 28
Vehicle keys .................................................................24
Changing wheels ........................................................... 245
Inflating the space-saver tire ................................. 249
Charge indicator lamp .................................................. 223
CHECK ENGINE malfunction indicator lamp ............ 218
Check regularly and before a long trip ....................... 215
Checking engine oil level
Via engine oil level indicator ....................................89
Via oil dipstick .......................................................... 233
Child restraint ..............................................38, 46, 53, 65
Cleaning and care of the vehicle ................................ 278
Climate control .................................................................98
Air recirculation ........................................................102
Basic setting ...............................................................100
Defogging windows ................................................... 101
Defrosting windshield .............................................. 101
Dust filter ...................................................................102
Rear window defroster ............................................. 103
Special settings ......................................................... 101

309 Index
Te ch n ica l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car careIndex Special settings (Climate control) ............................... 101
Split rear seat bench ..................................................... 120
Easy entry/exit feature ............................................ 123
Rear seat head restraints ......................................... 124
SRS indicator lamp ........................................................ 219
SRS malfunction .............................................................. 57
Start lock-out .................................................................... 25
Starting and turning off the engine ............................ 164
Steering lock ................................................................... 162
Steering wheel
Adjustable .................................................................... 70
Indicator lamp ...........................................................222
Stop lamp, high mounted .............................................267
Storage compartments
Center console ............................................................115
Compartment under front passenger seat .............116
Glove box .....................................................................115
Stowing things in the vehicle ......................................230
Stranded vehicle ............................................................259
Sun visors ........................................................................113
Supplemental restraint system (SRS) ........................... 54
Synchronizing remote control ..................................... 271
TTachometer ........................................................................82
Technical data ................................................................ 287
Electrical system ...................................................... 290
Main dimensions ...................................................... 291
Rims and tires ..................................................288, 289
Weights ...................................................................... 290
Tele Aid ............................................................................ 148
Emergency calls ........................................................149
Information ................................................................ 154
Initiating an emergency call manually .................. 151
Roadside Assistance ................................................. 152
Telephone, general ......................................................... 139
Telephones and two-way radios ................................... 146
Telescoping steering column
Adjusting ......................................................................70
Indicator lamp .......................................................... 222
The first 1 000 miles (1 500 km) ................................147
Third row seats ...............................................................126
Tie-down rings, cargo .................................................... 132
Tire inflation pressure ................................................. 250
Tire traction ....................................................................178

301
Index
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints Car care
Index
Brake fluid ............................................................. 175, 294
Brake warning lamp ................................................. 219
Capacity ......................................................................293
Brake pad wear indicator .............................................225
Brake warning lamp ...................................................... 219 Brake fluid low .......................................................... 219
Brakes ....................................................173, 175, 293, 294
CCapacities Fuels, coolants, lubricants etc. ...............................292
Cargo area ....................................................................... 131 Hooks .......................................................................... 133
Loading instructions ................................................ 136
Cargo area cover blind .................................................. 137
Cargo compartment lamp .............................................. 111
Cargo floor plates
Removable .................................................................. 129
Storage ........................................................................ 130
Cargo tie-down rings ..................................................... 132
Catalytic converter ........................................................ 160
Cellular telephone ......................................................... 139
Center console .................................................................. 20
Central locking switch .................................................... 32 Central locking system .................................................... 26
Automatic central locking .........................................32
Locking and unlocking ............................................... 27
Mechanical keys ..........................................................29
Panic button .................................................................28
Remote control ............................................................26
Unlocking the liftgate ................................................. 28
Vehicle keys .................................................................24
Changing wheels ........................................................... 245 Inflating the space-saver tire ................................. 249
Charge indicator lamp .................................................. 223
CHECK ENGINE malfunction indicator lamp ............ 218
Check regularly and before a long trip ....................... 215
Checking engine oil level Via engine oil level indicator ....................................89
Via oil dipstick .......................................................... 233
Child restraint ..............................................38, 46, 53, 65
Cleaning and care of the vehicle ................................ 278
Climate control .................................................................98 Air recirculation ........................................................102
Basic setting ...............................................................100
Defogging windows ................................................... 101
Defrosting windshield .............................................. 101
Dust filter ...................................................................102
Rear window defroster ............................................. 103
Special settings ......................................................... 101

309
Index
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints Car care
Index
Special settings (Climate control) ............................... 101
Split rear seat bench ..................................................... 120 Easy entry/exit feature ............................................ 123
Rear seat head restraints ......................................... 124
SRS indicator lamp ........................................................ 219
SRS malfunction .............................................................. 57
Start lock-out .................................................................... 25
Starting and turning off the engine ............................ 164
Steering lock ................................................................... 162
Steering wheel
Adjustable .................................................................... 70
Indicator lamp ...........................................................222
Stop lamp, high mounted .............................................267
Storage compartments Center console ............................................................115
Compartment under front passenger seat .............116
Glove box .....................................................................115
Stowing things in the vehicle ......................................230
Stranded vehicle ............................................................259
Sun visors ........................................................................113
Supplemental restraint system (SRS) ........................... 54
Synchronizing remote control ..................................... 271
TTachometer ........................................................................82
Technical data ................................................................ 287 Electrical system ...................................................... 290
Main dimensions ...................................................... 291
Rims and tires ..................................................288, 289
Weights ...................................................................... 290
Tele Aid ............................................................................ 148 Emergency calls ........................................................149
Information ................................................................ 154
Initiating an emergency call manually .................. 151
Roadside Assistance ................................................. 152
Telephone, general ......................................................... 139
Telephones and two-way radios ................................... 146
Telescoping steering column
Adjusting ......................................................................70
Indicator lamp .......................................................... 222
The first 1 000 miles (1 500 km) ................................147
Third row seats ...............................................................126
Tie-down rings, cargo .................................................... 132
Tire inflation pressure ................................................. 250
Tire traction ....................................................................178

136 Controls in detailAutomatic climate controlThe 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
(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.
iSevere 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
Briefly press buttonU
(page 135).
The indicator lamp comes on. The tem-
perature, air volume and distribution
are controlled automatically.

Adjust the temperature with the tem-
perature control4 (
page 135).
Temperature control is switched off in
the extreme position (blue or red dot).
Switching off

Briefly press buttonU
(page 135).
The indicator lamp goes out. The auto-
matic mode is switched off.
Air volume control1 is set to fan
speed 2 and air distribution is set
toV.Activating basic setting

Press buttonU at least
three seconds.
All functions are switched to automatic
mode and temperature is set to 72°F
(22°C).
Changing basic setting

Set temperature control4
(page 135) to desired temperature.

Press buttonU for ten seconds.
The selected temperature value is
stored and set.Adjusting air volume and air distribu-
tion manually
Adjusting air volume
Turn air volume control1 to one of
five air volume settings.
iAdjust temperature settings in small
increments.
iIf you turn air volume control1 or air
distribution control8 (
page 135),
the automatic mode switches off. The
indicator lamp in the buttonU goes
out. The temperature control will still
be in automatic mode.
iWhen 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 detailAutomatic climate controlAdjusting air distribution
Turn air distribution control8
(page 135) to one the following
symbols:
Windshield fogged on the outside

Switch the windshield wipers on,
(page 50).

Turn air distribution control8 toh
ork.
Defrosting
Activating
Press buttonP (
page 135).
The indicator lamp on the button
comes on.
Deactivating

Press buttonP again.
or

Press buttonU (
page 135).
The indicator lamp on the buttonP
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
iThese 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.

Model 163 up to 31.8.01
The following components are integrated into the heater control unit (S98):
Blower switch (1): with 0 setting and 4 levels.
The blower switch (1) is not available as an individual part.
Temperature selector wheel (2): with the "Blue", non-heating setting and the continuously variable heater
setting.
Air distribution switch (3): with the settings: Defroster vents, footwe ll, center plane and intermediate settings.
Recirculation switch ( ): Functions if diode is illuminated.
Fig. 34: Identifying Blower Switch, Selector Wheel And Air Distribution Switch On Heater Control Unit

HEATER CORE, FUNCTI ON - GF83.20-P-2101-01GC
Function
The heater coolant flows through the heater core. The he at is conducted to the outside by the aluminum tubes
and fins.
This heats up the air flowing through on the way to the vari ous defroster, vent and heater nozzles in the vehicle
passenger compartment.
HEATING SYSTEM HEAT EXCHANGE R, LOCATION - GF83.20-P-2101-02GH
The heater core (1) is located behind the instrument panel in the heater/ A/C housing.
Blower switch, location/task/design/function GF83.25-P-2100GC
Air distribution switch, locat ion/task/design/ function GF83.25-P-2101GH
Temperature selector wheel, location/task/ design/function GF83.25-P-2102GC
Air recirculation switch, loca tion/task/design/ function GF83.10-P-2117GH

2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 44 © 2006 Mitchell Repair Information Company, LLC.

Fig. 45: Identifying Blower Switch - Model 163 As Of 1.9.01 With Code (580a Automatic Air
Conditioning
AIR DISTRIBUTION SWITCH, FUNCTION - GF83.25-P-2101-01GH
Function
Turning the air distribution switch causes two wire cables to move the air distribution flaps, in order to route air
through the air distribution system to the air vents. The air vents are:
defroster vents for windshield/side windows
center air vents
lower air vents
There are 12 possible indented positions for air distribution.
AIR DISTRIBUTION SWITCH, FUNCTION - GF83.25-P-2101-01GI
Function
The air distribution can be set manually or automatically:
Manual
Turning the air distribution switch

Blower
switch,
location
The blower switch (1) is located on left in the AAC push-button control module (N22).
Blower
switch, taskThe blower switch (1) activates several blower stages in fresh air and recirculating air
mode.
Blower
switch designThe blower switch (1) is equipped with a rotary ring with which the blower levels can be
set. The LEDs in the rotary ring display the set blower level.

Blower
switch,
functionThe blower switch (1) sets the control voltage for the blower regulator in 6 stages and 5
intermediate settings via the push-button control module, depending on the setting. This
facilitates blower speed control of 0 -100 %.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 55 © 2006 Mitchell Repair Information Company, LLC.

Automatic
Pressing the Auto button ( )
Turning the air distribution switch on the AAC push-button control modul e (N22) actuates the various air
distribution actuators via air conditioner bus.
The following basic settings for air distribution are provided:
 Air flow from center and side vents
 Air flow at center, side,
footwell and defroster vents
 Air outlet at the center, side and defroster vents
 Air flow at center, side and footwell vents
Apart from the 4 listed basic settings, a furt her 8 intermediate settings can be selected.
AIR DISTRIBUTION SWITCH, LOCATION - GF83.25-P-2101-02GH
Heater depiction
The air distribution switch (3) is loca ted in the heater control unit (S98).
Fig. 46: Identifying Ai r Distribution Switch

AIR DISTRIBUTION SWITCH , LOCATION/TASK/DESIGN/F UNCTION - GF83.25-P-2101GH
MODEL 163 up to 31.8.01
Air distribution
switch, location GF83.25-P-
2101-02GH
Air distribution
switch, taskThe air distribution switch regulates the flow of air through the air
distribution system to the air vent s for ventilation of the passenger
compartment.


2001 Mercedes-Benz ML320
1998-2005 HVAC Climate Control - 163 Chassis
me
Saturday, October 02, 2010 3:23:15 PMPage 56 © 2006 Mitchell Repair Information Company, LLC.