2003 MERCEDES-BENZ C230 COUPE coolant level

257 Practical hints
What to do if …
Display
Possible cause
Suggested solution
B
COOLANT
CHECK LEVEL
The coolant level is too low.

Add coolant (
page 229).

If you have to add coolant frequently,
have the cooling system checked by
an authorized Mercedes-Benz Cen-
ter.
Warning!
G
Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. You can be seriously burned.
!Do not ignore the low engine coolant
level warning. Extended driving with
the message and symbol displayed
may cause serious engine damage not
covered by the Mercedes-Benz Limited
Warranty.
Do not drive without sufficient amount
of coolant in the cooling system. The
engine will overheat, causing major en-
gine damage.

270 Practical hintsWhat to do if …Display
Possible cause
Suggested solution
#
UNDERVOLTAGE
ENGINE ON!
The battery has insufficient voltage and
can no longer supply the convenience
functions such as seat heater*.
Start the engine (
page 44).
UNDERVOLTAGE
SWITCH CONSUMERS OFF!
The battery is malfunctioning.

Have the battery checked at a ser-
vice station.
G
VISIT WORKSHOP!
DISPLAY DEFECTIVE
The instrument cluster display is malfunc-
tioning.

Continue driving with added caution.

Visit an authorized Mercedes-Benz
Center as soon as possible.
±
VISIT WORKSHOP!
DISPLAY DEFECTIVE
Certain electronic systems are unable to
relay information to the control system.
The following systems may have failed:

Coolant temperature gauge


Tachometer


Cruise control display

Have the electronic systems checked
by an authorized Mercedes-Benz
Center (
page 250).
W
WASHER FLUID
CHECK LEVEL!
The fluid level has dropped to about
1/3 of
total reservoir capacity.

Add washer fluid (
page 232).

322 Technical dataFuels, coolants, lubricants etc.Coolant system design and coolant used
stipulate the replacement interval. The
above replacement interval is only applica-
ble if MB 325.0 anticorrosion/antifreeze
solution or other Mercedes-Benz approved
products of equal specification (see Facto-
ry Approved Service Products pamphlet)
are used to renew the coolant concentra-
tion or bring it back up to the proper level.
To provide important corrosion protection,
the solution must be at least 45% anticor-
rosion/antifreeze (equivalent to freeze
protection to approx. - 22°F [-30°C]). If
you use a solution that is more than 55%
anticorrosion/antifreeze (freeze protec-
tion to approx. - 49°F [-45°C]), the engine
temperature will increase due to the lower
heat transfer capability of the solution.
Therefore, do not use more than this
amount of anticorrosion/antifreeze.If the coolant level is low, water and
MB 325.0 anticorrosion/antifreeze should
be used to bring it up to the proper level
(have cooling system checked for signs of
leakage). Please make sure that the mix-
ture is in accordance with label instruc-
tions.
The water in the cooling system must meet
minimum requirements, which are usually
satisfied by normal drinking water. If you
are not sure about the water quality, con-
sult your authorized Mercedes-Benz
Center.Anticorrosion/antifreeze
Your vehicle contains a number of alumi-
num parts. The use of aluminum compo-
nents in motor vehicle engines
necessitates that anticorrosion/antifreeze
coolant used in such engines be specifical-
ly formulated to protect the aluminum
parts. (Failure to use such anticorro-
sion/antifreeze coolant will result in a sig-
nificantly shortened service life.)
Therefore, the following product is strongly
recommended for use in your vehicle:
Mercedes-Benz 325.0 Anticorrosion/Anti-
freeze agent.
Before the start of the winter season (or
once a year in hot southern regions), you
should have the anticorrosion/antifreeze
concentration checked. The coolant is also
regularly checked each time you bring your
vehicle to your authorized Mercedes-Benz
Center for service.

336 IndexCassette player
Operating 112
Catalytic converter 222
CD changer* 172
CD mode 172
CD player
Operating 111
Center console 25
AIRBAG OFF indicator lamp 251
Centigrade
Setting temperature units 117
Central locking
From inside 87
Switch 87
Switching on/off (control system) 122
Unlocking from inside 87
Central locking switch 87
Certification label 308
Changing
Batteries (SmartKey) 276
Key setting 123
Changing CDs 172
Charcoal filter 156
Charging
Vehicle battery 295CHECK ENGINE malfunction indicator
lamp 250
Checking
Coolant level 225, 229
Oil level 225, 227
Tire inflate pressure 225
Vehicle lighting 225
Child safety 65
Airbags 58
Infant and child restraint systems 62,
65
LATCH child seat mounts 70
Child seat mounts see LATCH child seat
mounts 70
Cigarette lighter 199
Cleaning
Cup holder 243
Gear selector lever 243
Hard plastic trim items 244
Headlamps 140
Headliner 244
Instrument cluster 243
Leather upholstery 244
Light alloy wheels 243
MB Tex upholstery 244
Plastic and rubber parts 244Seat belts 244
Steering wheel 243
Windows 243
Windshield 49
Wiper blades 243
Climate control 142
Adjusting 145
Defogging windshield 145
Defrosting 146
Rear window defroster 147
Setting the temperature 145
Clock 23, 116
Closing
Glove box 195
Hood 227
Side windows 182
Sliding/pop-up roof 186, 278
Sliding/pop-up roof with SmartKey
187
Sunshades for the
sliding/pop-up roof 185
Trunk lid 86
Windows 182
Windows with SmartKey 183
Closing sliding/pop-up roof
In an emergency 278

337 Index
Cockpit 20, 327
Cockpit management and data system
(COMAND*) 328
Collapsible tire 328
COMAND* 328
COMAND* see separate operating
instructions
Combination switch 99
High beam flasher 48, 99
Turn signals 47
Windshield wipers 48
Consumer information 325
Control and operation of
radio transmitters 222
Control system 105, 328
AUDIO menu 110
Convenience submenu 123
Display digital speedometer 110
Functions 106, 109
Instrument cluster submenu 116
Lighting submenu 119
Malfunction memory menu 112
Menus 108, 109, 329
Multifunction display 105
Multifunction steering wheel 106
NAV menu 112Selecting radio system 111
Settings menu 114
Standard display menu 110
Submenus 107, 109
TEL* menu 126
Trip computer menu 125
Vehicle submenu 122
Convenience submenu 123
Activating easy-entry/exit feature 123
Setting key dependency 124
Setting parking position for exterior
rear view mirror 124
Coolant 229, 321
Adding 230
Anticorrosion/antifreeze quantity 322
Capacities 317
Checking level 229
Messages in display 257, 258
Temperature 223
Temperature gauge 102
Warning lamp 258
Coolant level
Checking 225, 229
Cruise control 189, 328
Canceling 190
Driving downhill 190Driving uphill 190
Fine adjustment 191
Saving current speed 190
Setting speeds 191
Cruise control lever 189
Cup holder
Cleaning 243
In front seat armrest 196
Customer Assistance Center (CAC) 327
D
Daytime running lamp mode 98
Setting 119
Deactivating
Air conditioning (cooling) 148
Air recirculation mode 147, 155
Alarm 79
Anti-theft alarm system 79
Automatic climate control 151
Central locking (control system) 122
Climate control 143
Cruise control 190
Defrost 146, 154
Engine with the key 53
ESP 76
Exterior lamps 97
Exterior lamps delayed shut-off 120

344 IndexMalfunction
Displaying 113
Malfunction memory 112
Calling up 112
Manual headlamp mode 97
Manual operations
Fuel filler flap 277
Interior lighting control 100
Locking the vehicle 275
Sliding/pop-up roof 278
Unlocking the driver’s door 274
Unlocking the trunk lid 275
Unlocking transmission selector lever
277
Manual seat
Adjusting 33
Adjusting backrest tilt 33
Adjusting head restraint height 33
Adjusting head restraint tilt 34
Adjusting seat cushion tilt 33
Adjusting seat height 33
Front seat head restraints 90
Seat fore and aft adjustment 33
Manual transmission 130
Shifting into reverse 131
Starting with 44MAXCOOL maximum cooling 154
MB Tex upholstery
Cleaning 244
Mechanical key 274, 275
Memory function 93, 329
Recalling positions from memory 94
Storing exterior rear view mirror park-
ing positions 95
Storing key dependent settings 94
Menus 106
AUDIO 110
Control system 329
In control system 108, 109
Malfunction memory 112
NAV 112
Settings menu 114
Standard display 110
Submenus 107
TEL* 126
Trip computer 125
Microphone
Hands-free microphone 26
Miles/kilometers in speedometer
Setting 117Mirrors
Adjusting 39
Automatic antiglare for rear view mirror
138
Exterior rear view mirror 40
Exterior rear view mirror parking posi-
tions 124
Inside rear view mirror 39
Storing exterior rear view mirror park-
ing position 95
MON 225
MON (Motor Octane Number) 329
Mph or km/h in speedometer 117
Multifunction display 105, 329
Selecting language 118
Standard display 109
Multifunction display messages
ABS 253
BAS 254
Battery 270
Brake fluid 256
Brake pads 256
Check engine 250
Coolant 258
Coolant level 257
Display 270