1997 MERCEDES-BENZ ML320 air condition

Contents
Opening / closing in an emergency .... 265
Sliding / pop-up roof* ................... 265
Replacing bulbs ................................. 266
Bulbs ............................................ 266
Replacing bulbs for front lamps ... 268
Replacing bulbs for rear lamps..... 270
Adjusting headlamp aim............... 272
Replacing wiper blades ...................... 273
Removing ..................................... 273
Installing ...................................... 273
Flat tire .............................................. 274
Mounting the spare wheel............ 274
Battery ............................................... 278
Disconnecting the battery ............ 279
Removing the batteries ................ 279
Charging and reinstalling
batteries....................................... 279
Reconnecting the batteries .......... 279
Jump starting ..................................... 281
Towing the vehicle ............................. 283
Front towing eye .......................... 285
Rear towing eye ........................... 285
Stranded vehicle .......................... 286Fuses .................................................. 287
Fuse box in engine
compartment ................................ 287
Auxiliary fuse box in front
passenger footwell........................ 288
Technical data.................................. 289
Spare parts service............................. 290
Warranty coverage ............................. 291
Loss of Service and Warranty
Information Booklet ...................... 291
Identification labels ............................ 292
Layout of poly-V-belt drive .................. 293
Engine ................................................ 294
Rims and tires .................................... 295
Rims and tires ............................... 295
Spare wheel .................................. 296
Electrical system ................................ 297
Main Dimensions ................................ 298
Weights .............................................. 299Fuels, coolants, lubricants etc............ 300
Capacities ..................................... 300
Engine oils .................................... 302
Engine oil additives ....................... 302
Air conditioning refrigerant ........... 302
Brake fluid .................................... 302
Premium unleaded gasoline.......... 303
Fuel requirements......................... 303
Gasoline additives......................... 303
Coolants ....................................... 304
Anticorrosion / antifreeze.............. 305
Windshield washer system and
headlamp cleaning system* ......... 307
Windshield and headlamp
washer fluid mixing ratio............... 307
Consumer information........................ 308
Uniform tire quality grading .......... 308
Temperature ................................. 309
Technical terms............................... 311Index................................................. 317

11 Introduction
Operator’s Manual
Important notice for California retail
buyers and lessees of Mercedes-Benz automobiles
Under California law you may be entitled to
a replacement of your vehicle or a refund
of the purchase price or lease price, if
Mercedes-Benz USA, LLC and / or its au-
thorized repair or service facilities fail to fix
one or more substantial defects or mal-
functions in the vehicle that are covered by
its express warranty after a reasonable
number of repair attempts. During the pe-
riod of 18 months from original delivery of
the vehicle or the accumulation of
18 000 miles (approx. 29 000 km) on the
odometer of the vehicle, whichever occurs
first, a reasonable number of repair at-
tempts is presumed for a retail buyer or
lessee if one or more of the following oc-
curs:(1) the same substantial defect or mal-
function results in a condition that is
likely to cause death or serious bodily
injury if the vehicle is driven, that de-
fect or malfunction has been subject to
repair two or more times, and you have
directly notified Mercedes-Benz USA,
LLC in writing of the need for its repair,
(2) the same substantial defect or mal-
function of a less serious nature than
category (1) has been subject to repair
four or more times and you have direct-
ly notified us in writing of the need for
its repair, or(3) the vehicle is out of service by reason
of repair of the same or different sub-
stantial defects or malfunctions for a
cumulative total of more than
30 calender days. Written notification
should be sent to us, not a dealer, at
Mercedes-Benz USA, LLC, Customer
Assistance Center, One Mercedes
Drive, Montvale, NJ 07645-0350.

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.

139 Controls in detail
Automatic climate control
Activating
Press buttonÄ (
page 135).
The indicator lamp on the button
comes on.
Deactivating

Press buttonÄ (
page 135).
The indicator lamp on the button goes
out.
Air conditioning
The air conditioning is operational while
the engine is running and cools the interior
air to the temperature set by the operator.Deactivating
It is possible to deactivate the air condi-
tioning (cooling) function of the automatic
climate control system. The air in the vehi-
cle will then no longer be cooled or dehu-
midified.

Press button° (
page 135).
The indicator lamp on the button°
comes on.
Activating
Moist air can fog up the windows. You can
dehumidify the air with the air condition-
ing.

Press button° again.
The indicator lamp on the button°
goes out.
The air conditioning system uses the refrig-
erant R-134a. This refrigerant is free of
CFCs which are harmful to the ozone layer.
iTo achieve the fastest possible cooling
of the interior, the automatic climate
control automatically switches to air
recirculation. The indicator lamp in the
buttonÄ is not illuminated when
the system automatically switches to
air recirculation.
iThe air recirculation mode is
deactivated automatically

after 30 minutes if the automatic
climate control is switched on


after five minutes if the air condi-
tioning is switched off


after five minutes if the outside
temperature is above approximate-
ly 45°F (7 °C)
iCondensation may drip out from under-
neath the vehicle. This is normal and
not an indication of a malfunction.

140 Controls in detailAutomatic climate control
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
Turn the key in the steering lock to
position0 or1 (
page 33).

Press button° (
page 135).
The indicator lamp on button°
comes on.Deactivating

Press button°.
The indicator lamp on button°
goes out.
!If the °button on the automatic
climate control panel starts to flash,
this indicates that the air conditioning
system is losing refrigerant. The com-
pressor has turned itself off. The air
conditioning cannot be turned on
again.
Have the air conditioning system
checked at the nearest authorized
Mercedes-Benz Light Truck Center.
iHow long the system will provide heat-
ing depends on the coolant tempera-
ture and the temperature set in the
climate control. The blower will run at
lower speed regardless of the air vol-
ume control setting.
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

206 OperationDriving instructionsOff-road driving increases strain on the
vehicle.
We recommend that you inspect the vehi-
cle for possible damage after each off-road
trip. Recognizing any damage and a subse-
quent timely repair reduces the chance of
a possible breakdown or accident later on.
Proceed as follows:

Switch off the LOW RANGE mode
(page 125).


Remove excessive dirt from tires,
wheels, wheel housings, and under-
body.
For instance, after driving in mud, clean
the radiator, chassis, engine, brakes,
and wheels from extreme dirt using a
strong jet of water.


Inspect frame, oil pan, brake hoses,
etc., as well as vehicle underbody for
possible damage.


Check tires for possible damage, clean
all exterior lamps, and conduct a brake
test.


Check for brush or branches caught in
the undercarriage.
They could increase the possibility of a
fire, as well as cut fuel and / or brake
lines, puncture rubber bellows of the
axles or drive shafts.


After continued operation in mud,
sand, water or other dirty conditions
clean the brake discs, wheels, brake
pads and check and clean axle joints.
Trailer towingWarning!
G
Failure to use proper equipment and driving
technique can result in a loss of vehicle con-
trol when towing a trailer.
Improper towing or failure to follow the in-
structions contained in this guide can result
in serious injury. Follow the guidelines be-
low carefully to assure safe trailer operation.
Ask your authorized Mercedes-Benz Light
Truck Center should you require an explana-
tion of information contained in this guide.

210 OperationDriving instructions

The vehicle and trailer combination is
heavier, and therefore is limited in ac-
celeration and climbing ability, and re-
quires longer stopping distances.
I t i s m o r e p r o n e t o r e a c t i n g t o s i d e w i n d
gusts, and requires more sensitive
steering input.


If possible, do not brake abruptly, but
rather engage the brake slightly at first
to permit the trailer to activate its
brake. Then increase the braking force.


If the transmission hunts between
gears on inclines, manually shift to a
lower gear (select 4, 3, 2 or 1).
A lower gear and reduction of speed re-
duces the chance of engine overload-
ing and / or overheating.


On very steep inclines, not manageable
with gear selector lever in position1,
switch transfer case to LOW RANGE
mode (
page 125).


When going down a long hill, shift into
a lower gear and use the engine’s brak-
ing effect.
Avoid riding the brakes, thus overheat-
ing the vehicle and trailer brakes.


If the engine coolant rises to an ex-
tremely high temperature (coolant tem-
perature needle approaching the red
zone) when the air conditioning is on,
turn off the air conditioning system.
Engine coolant heat can be additionally
vented by opening the windows,
switching the climate control fan speed
to high and setting the temperature
control to the maximum hot position.


Extreme care must be exercised since
your vehicle with a trailer will require
additional passing distance ahead than
when driving without a trailer.
Because your vehicle and trailer is
longer than your vehicle alone, you will
also need to go much farther ahead of
the passed vehicle before you can re-
turn to your lane.
!If the trailer should begin to sway, re-
duce the vehicle’s speed and use the
brake controller by hand to straighten
out the vehicle and trailer.
In no case should you attempt to
straighten out the tow vehicle and trail-
er by increasing the speed or overstee-
ring and stepping on the brakes.

212 OperationDriving instructionsTelephones and two-way radios
Radio transmitters, such as a portable tele-
phone or a citizens band unit should only
be used inside the vehicle if they are con-
nected to an antenna that is installed on
the outside of the vehicle.
Refer to the radio transmitter operation in-
structions regarding use of an external an-
tenna.
Catalytic converter
Your Mercedes-Benz is equipped with
monolithic-type catalytic converters, an
important element in conjunction with the
oxygen sensors to achieve substantial con-
trol of the pollutants in the exhaust emis-
sions. Keep your vehicle in proper
operating condition by following our rec-
ommended maintenance instructions as
outlined in your Service Booklet.
Emission control
Certain engine systems serve to keep the
toxic components of the exhaust gases
within permissible legal limits.
These systems, of course, will function
properly only when maintained strictly ac-
cording to factory specifications. Any ad-
justments on the engine should, therefore,
be carried out only by qualified
Mercedes-Benz Light Truck Center autho-
rized technicians. Engine adjustments
should not be altered in any way. More-
over, the specified service jobs must be
Warning!
G
Never operate radio transmitters equipped
with a built-in or attached antenna (i.e. with-
out being connected to an external antenna)
from inside the vehicle while the engine is
running. Doing so could lead to a malfunc-
tion of the vehicle’s electronic system, pos-
sibly resulting in an accident and / or
personal injury.
!To prevent damage to the catalytic con-
verters, use only premium unleaded
gasoline in this vehicle.
Any noticeable irregularities in engine
operation should be repaired promptly.
Otherwise, excessive unburned fuel
may reach the catalytic converter,
causing it to overheat and start a fire.
Warning!
G
As with any vehicle, do not idle, park or op-
erate this vehicle in areas where combusti-
ble materials such as grass, hay or leaves
can come into contact with the hot exhaust
system, as these materials could be ignited
and cause a vehicle fire.