coolant MERCEDES-BENZ ML320 1997 Complete Service Manual

215
Check regulary and before a long trip
Te ch n ica l
data
Instruments
and controls Operation
Driving Instrument
cluster display Practical hints Car care Index
Check regularly and before a long trip 1
Engine oil level
See “Checking engine oil level” on page 233 and
“Engine oil level indicator” on page 89.
2 Coolant level
See “Coolant level” on page 234.
3 Brake fluid
See “Brake fluid” on page 294.
4 Windshield washer system/
Headlamp cleaning system/
Rear window washer system
For refilling reservoir see page 236.
Opening hood, see page 231.
Ve h i c l e l i g h t i n g : Check function and cleanliness. For
replacement of light bulbs, see “Exterior lamps” on
page 260.
Exterior lamp switch, see page 90.

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Contents - Instrument cluster display
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints Car care Index
Instrument cluster displayMalfunction and indicator
lamps in the
instrument cluster .................... 218
On-board diagnostic system –
Check engine malfunction
indicator lamp ............................. 218
Brake warning lamp .................. 219
Supplemental restraint system
(SRS) indicator lamp .................. 219
Fuel reserve warning .................220 Electronic stability
program (ESP) / Electronic
traction system (ETS) –
warning lamp ............................. 221
BAS/ESP malfunction
indicator lamp ............................ 221
4-ETS malfunction
indicator lamp ............................ 221
LOW RANGE
indicator lamp ............................ 221
ABS malfunction
indicator lamp ............................ 222 Adjustable steering wheel –
indicator lamp .............................222
AIRBAG OFF
indicator lamp .............................222
Seat belt warning lamp .............223
Charge indicator lamp ...............223
Low engine oil level
warning lamp ..............................224
Low engine coolant
level warning ..............................224
Brake pad wear
indicator lamp .............................225
FSS indicator ...............................225

224
Malfunction and indicator lamps
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data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints Car care Index
Low engine oil level warning lamp With the key in steering lock position 2, the
oil level warning lamp comes on and should
go out when the engine is running.
If the warning lamp does not go out after starting the
engine, or comes on with the engine running and at
operating temperature, the engine oil level has dropped
to approximately the minimum mark on the dipstick.
When this occurs, the warning lamp will first come on
intermittently and then stay on if the oil level drops
further.
If no oil leaks are noted, continue to drive to the nearest
service station where the engine oil should be topped to
the “full” mark on the dipstick with an approved oil.
The low engine oil level warning light should not be
ignored. Extended driving with the light illuminated
could result in serious engine damage that is not
covered by the Mercedes-Benz Limited Warranty.
In addition to the warning lamp, the engine oil level
should be periodically checked with the dipstick or via
the oil level indicator in the odometer display field, for
example during a fuel stop, or before a long trip (see
engine oil level indicator on page 89 and checking
engine oil on page 233). Low engine coolant level warning
When the coolant level warning lamp comes
on while driving, then the coolant level has
dropped below the required level, or the
coolant temperature is in the red zone. If no leaks are
noticeable and the engine temperature does not
increase, continue to drive to the nearest service station
and have coolant added to the coolant system, see
page 234. If the engine temperature reaches the red
zone, move vehicle to an area which is in a safe distance
from the roadway and turn off the engine. Also see
coolant temperature gauge on page 81.
The low engine coolant level warning should not be
ignored. Extended driving with the symbol displayed
may cause serious engine damage not covered by the
Mercedes-Benz Limited Warranty.
In cases of major or frequent minor coolant loss, have
the cooling system checked at your authorized
Mercedes-Benz Light Truck Center as soon as possible.
Notes:
Do not drive without coolant in the cooling system. The
engine will overheat causing major engine damage.
Monitor the coolant temperature gauge while driving.

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Contents - Practical hints
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints
Car care Index
Practical hintsFirst aid kit .....................................228
Fuses ................................................228
Electrical outlet ..............................230
Stowing things in the vehicle ......230
Hood ................................................. 231
Checking engine oil level .............233
Automatic transmission fluid level ...................................234
Engine oil consumption ................234
Coolant level ...................................234 Adding coolant ...........................235
Windshield washer/headlamp cleaning system .........................236
Windshield and
headlamp washer fluid
mixing ratio ................................237 Vehicle jack, wheel bolt
wrench and screwdriver ......... 237
Air pump ......................................... 239
Wheels ............................................ 240 Tire replacement ....................... 240
Rotating wheels ......................... 241
Spare wheel .................................... 242
Changing wheels ........................... 245
Tire inflation pressure ................. 250
Battery ............................................. 251
Jump starting ................................. 253
Towing the vehicle ........................ 255 Transmission selector lever,
manually unlocking .................. 259
Stranded vehicle ............................ 259 Exterior lamps ................................260
Headlamp assembly ................... 261
Taillamp assemblies ..................265
Adjusting headlamp aim ...............268
Remote control battery replacement .................270
Synchronizing
remote control ............................ 271
Emergency operation of sliding/pop-up roof ...................272
Emergency operation of Skyview Top ...............................273
Manual release for fuel filler flap ............................. 274
Replacing wiper blades .................275
Roof rack ......................................... 276

232
Engine compartment
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints
Car care Index
Wa r n i n g !
To help prevent personal injury, stay clear of
moving parts when the hood is open and the engine
is running. Be sure the hood is properly closed
before driving. When closing hood, use extreme
caution not to catch hands or fingers.The radiator fan may continue to run for
approximately 30 seconds or even restart after the
engine has been turned off. Stay clear from fan
blades.
The engine is equipped with a transistorized
ignition system. Because of the high voltage it is
dangerous to touch any components (ignition coils,
spark plug sockets, diagnostic socket) of the
ignition system
• with the engine running,
• while starting the engine,
• if ignition is “on” and the engine is turned manually.If you see flames, steam or smoke coming from the
engine compartment, or if the coolant temperature
gauge indicates that the engine is overheated, do
not open the hood. Move away from vehicle and do
not open the hood until the engine has cooled. If
necessary, call a fire department.

234
Engine compartment
Te ch n ica l
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Instruments
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Instrument
cluster display Practical hints
Car care Index
Automatic transmission fluid level
The transmission has a permanent fill of automatic
transmission fluid.
Regular automatic transmission fluid level checks and
changes are not required. For this reason the dipstick is
omitted.
If you notice fluid leaks or gear shifting malfunctions,
have your authorized Mercedes-Benz Light Truck Center
check the transmission fluid level.
Engine oil consumption
Engine oil consumption checks should only be made
after the break-in period. During the break-in period,
higher oil consumption may be noticed and is normal.
Frequent driving at high engine speeds results in
increased consumption. Coolant level
To check the coolant level, the vehicle must be parked
on level ground and the engine stopped.
Check coolant level only when coolant is cold.
The coolant level should reach the COLD LEVEL mark in
the reservoir.P20.30-0241-20

235
Engine compartment
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints
Car care Index
Adding coolant
If coolant has to be added, a 50 / 50 mixture of water and
MB anticorrosion / antifreeze should be added.
After adding coolant, close cap until you hear it click a
few times.
The drain plugs for the cooling system are located on
the left and right side of the engine block directly above
the engine mounts and at the bottom of the radiator.
Anticorrosion / antifreeze mixture, see page 297.
Wa r n i n g !
In order to avoid possible serious burns or injury: • Use extreme caution when opening the hood if there are any signs of steam or coolant leaking
from the cooling system, or if the coolant
temperature gauge indicates that the coolant is
overheated.
• Do not remove pressure cap on coolant reservoir if engine temperature is above 194 °F
(90 °C). Allow engine to cool down before
removing cap. The coolant reservoir contains
hot fluid and is under pressure.• Using a rag, slowly open cap approximately 1/2 turn to relieve excess pressure. If opened
immediately, scalding hot fluid and steam will
be blown out under pressure.• Do not spill antifreeze on hot engine parts. Antifreeze contains ethylene glycol which may
burn if it comes into contact with hot engine
parts.

278
Cleaning and care of the vehicle
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data
Instruments
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Instrument
cluster display Practical hints
Car care Index
Cleaning and care of the vehicle
In operation, your vehicle is subjected to varying
external inf luences which, if gone unchecked, can
attack the paintwork as well as the underbody and
cause lasting damage.
Such damage is caused not only by extreme and varying
climatic conditions, but also by air polution, road salt,
tar, gravel and stone chipping. Grease and oil, fuel,
coolant, brake fluid, bird droppings, insects, tree resins
etc. should be removed immediately to avoid paint
damage. Frequent washing reduces and / or eliminates
the aggressiveness and potency of the above adverse
influences. More frequent washings are necessary to deal with
unfavorable conditions; for example, near the ocean, in
industrial areas (smoke, exhaust emissions), or during
winter operation.
You should check your vehicle from time to time for
stone chipping or other damage. Any damage should be
repaired as soon as possible to prevent the start of
corrosion.
In doing so, do not neglect the underside of the vehicle.
A prerequisite for a thorough check is a washing of the
underbody followed by a thorough inspection. Damaged
areas need to be reundercoated.
Your vehicle has been treated at the factory with a wax-
base ru stproof ing in th e body cavities w hich will la st for
the lifetime of the vehicle. Post-production treatment is
neither necessary nor recommended by Mercedes-Benz
because of the possibility of incompatibility between
materials used in the production process and others
applied later.
We have selected car-care products and compiled
recommendations which are specially matched to our
vehicles and which always reflect the latest technology.
You can obtain Mercedes-Benz approved car-care
products at your authorized Mercedes-Benz Light Truck
Center.
Wa r n i n g !
Many cleaning products can be hazardous. Some
are poisonous, others are flammable. Always follow
the instructions on the particular container.
Always open your vehicle’s doors or windows when
cleaning the inside.Never use fluids or solvents that are not designed
for cleaning your vehicle.

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Contents - Technical data
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data
Instruments
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Instrument
cluster display Practical hints Car care Index
Technical dataSpare parts service ........................284
Warranty coverage .........................284
Identification labels .......................285
Layout of poly-V-belt drive ............286
Technical data ................................287
Fuels, coolants, lubricants etc. – capacities .........................292 Engine oils ...................................... 294
Engine oil additives ...................... 294
Air conditioner refrigerant .......... 294
Brake fluid ...................................... 294
Premium unleaded gasoline ........ 295
Fuel requirements ........................ 295
Gasoline additives ......................... 296
Coolants .......................................... 296
Consumer information ................. 298

286
Technical data
Te ch n ica l
data
Instruments
and controls Operation Driving
Instrument
cluster display Practical hints Car care Index
Layout of poly-V-belt drive 1 Automatic belt tensioner
2 Crankshaft
3 Air conditioner compressor
4 Coolant pump
5 Generator (alternator)
6 Idler pulley
7 Power steering pump
For dimensions of the poly-V-belt, see technical data.