2005 MERCEDES-BENZ C320 open hood

317 Practical hints
What to do if …
During severe operating conditions and
stop-and-go city traffic, the coolant tem-
perature may rise close to 248°F (120°C).
Display symbol
Display message
Possible cause
Possible solution
•
Coolant
Stop, engine off!
The coolant is too hot.

Stop the vehicle and turn off the
engine.

Only start the engine again after the
message disappears. You could
otherwise damage the engine.
Warning!
G
Driving when your engine is badly over-
heated can cause some fluids which may
have leaked into the engine compartment to
catch fire. You could be seriously burned.
Steam from an overheated engine can cause
serious burns and can occur just by opening
the hood. Stay away from the engine if you
see or hear steam coming from it.
Turn off the engine, get out of the vehicle
and do not stand near the vehicle until the
engine has cooled down.
!The engine should not be operated with
the coolant temperature above 248°F
(120°C). Doing so may cause serious
engine damage which is not covered by
the Mercedes-Benz Limited Warranty.

322 Practical hintsWhat to do if …Display symbol
Display message
Possible cause
Possible solution
4
Check gas cap.
See Operator’s Manual
A loss of pressure has been detected in
the fuel system. The fuel cap may not be
closed properly or the fuel system may be
leaky.

Check the fuel cap (
page 275).
If it is not closed properly:

Close the fuel cap.
If it is closed properly:

Have the fuel system checked by an
authorized Mercedes-Benz Center.
Y
Hood open
You are driving with the hood open.

Close the hood (
page 278).
I
Remove key.
You have forgotten to remove the
SmartKey.

Remove the SmartKey from the starter
switch.
Replace key
Drive to workshop
No additional code available for
SmartKey.

Change the SmartKey.

347 Practical hints
Replacing bulbs
Replacing bulbs for front lamps
Before you start to replace a bulb for a
front lamp, do the following first:
Turn the exterior lamp switch to
positionM (
page 109).

Open the hood (
page 278) (except
for side marker lamps).
Halogen headlamp
1Housing cover for low beam headlamp
2Housing cover for high beam head-
lamp, parking and standing lamp3Bulb socket for turn signal lamp bulb
4Bulb socket for low beam bulb
5Bulb socket for high beam bulb
6Bulb socket for parking and standing
lamp bulbLow beam bulb

Press the clamp on housing cover1
and remove it.

Pull the electrical connector off.

Turn bulb socket4 counterclockwise
and take out the bulb.

Insert the new bulb so that its socket
locates in the recess of the lamp
housing.

Turn bulb socket4 clockwise until it
engages.

Plug the electrical connector onto the
bulb.

Align housing cover1 and press until
it engages.

352 Practical hintsReplacing wiper bladesRemoving wiper blades
Remove SmartKey from starter switch.

Fold wiper arm forward.
1Unlock
2Lock

Pull the tab in direction of arrow1 and
remove wiper blade.
Installing wiper blades
Slide the wiper blade into the cutout on
the wiper arm (see arrows).

Slide the tab back in the direction of
arrow2 until it audibly engages.

Fold the wiper arm backward to rest on
the windshield. Make sure you hold on
to the wiper when folding the wiper arm
back.
Warning!
G
For safety reasons, remove SmartKey from
starter switch before replacing a wiper
blade. Otherwise the motor could suddenly
turn on and cause injury.
!Never open the hood when the wiper
arms are folded forward.
Hold on to the wiper when folding the
wiper arm back. If released, the force
of the impact from the tensioning
spring could crack the windshield.
Do not allow the wiper arms to contact
the windshield glass without a wiper
blade inserted.
Make certain that the wiper blades are
properly installed. Improperly installed
wiper blades may cause windshield
damage.
For your convenience, we recommend
that you have this work carried out by
an authorized Mercedes-Benz Center.

361 Practical hints
Battery
1Negative terminal
2Positive terminal cover
Disconnecting the battery
Turn off the engine (
page 56).

Turn off all electrical consumers.

Remove SmartKey from starter switch.

Open the hood (
page 278).

Remove the filter box (
page 360).

Disconnect the battery negative lead
from negative terminal1.

Remove cover2 from the positive
terminal.

Disconnect the battery positive lead.
Removing the battery
Remove the screw-nuts securing the
battery.

Remove the battery bracket.

Take out the battery.
Charging and reinstalling the battery
Charge battery in accordance with the
instructions of the battery charger
manufacturer.

Reinstall the charged battery. Follow
the previously described steps in
reverse order.
Warning!
G
With a disconnected battery

you will no longer be able to turn the
SmartKey in the starter switch


the gear selector lever will remain
locked in positionP
Warning!
G
Never charge a battery while still installed in
the vehicle. Gases may escape during charg-
ing and cause explosions that may result in
paint damage, corrosion or personal injury.

417 Index
H
Halogen-type
Front lamp bulbs 347
Hands-free microphone 29
Hard plastic trim items
Cleaning 299
Hazard warning flasher 114
Switching off 114
Switching on 114
Head restraints 99
Front seats, manual seat 100
Front seats, power seat* 100
Manual seat 37
Power seat* 38
Rear seats 101
Head unit
Time synchronization* with 137
Headlamp cleaning system* 285
Headlamp shut-off delay see
Delayed shut-off, exterior lampsHeadlamps
Automatic control 110
Bi-Xenon* 399
Bi-Xenon* type
Replacing bulbs 349
Cleaning 297
Cleaning system* 168, 285, 396
Halogen-type, replacing bulbs 347
Refilling washer fluid 285
Switching off 55
Switching on 49
Washer fluid 396
Headliner and shelf below rear window
Cleaning 299
Heated seats* 105
Height adjustment
Head restraints, manual seat 37
Head restraints, power seat* 38
Rear seat head restraints 101
Seat belts 45
Steering wheel,
electrical* adjustment 40
Steering wheel,
manual adjustment 40High beam flasher 50, 113
High beam headlamps
Indicator lamp 25
Messages in display 324
Replacing bulbs 345, 348
Switching on 50, 113
High beam headlamps xenon type*
Replacing bulbs 349
High mounted brake lamp 345
Hood 278
Closing 279
Message in display 322
Opening 278
Horn 23
Hydroplaning 268
I
Identification labels 376
Certification label 376
Emission control
information label 376
Vacuum line routing
diagram label 376
Vehicle Identification Number 376

423 Index
One-touch gearshifting 158
Canceling gear range limit 158
Downshifting 158
Upshifting 158
Opening
Cup holder, in rear seat armrest 245
Doors from the inside 92
Fuel filler flap 276
Fuel filler flap manually 339
Glove box 241
Hood 278
Power tilt/sliding sunroof*
in an emergency 341
Side windows 223
Tilt/sliding sunroof* 227, 341
Tilt/sliding sunroof*
with SmartKey 229
Trunk 91
Trunk from the inside 93
Trunk from the outside 92
Windows 223
Windows with SmartKey 225Operating
Audio system 183
CD player* 129
COMAND* see separate
operating instructions
Navigation system* 130
Radio 128
Radio transmitters 272
Satellite radio* 128
Telephone* 150, 183, 208
Vehicle outside the
USA and Canada 13
Operating safety
Audio system 183
Operator’s Manual 10
Ornamental moldings 297
Outer seats
Rear seat head restraints 101, 103
Outside temperature 127
Outside temperature indicator 119
Overdue maintenance service 293
Overhead control panel 29
Overspeed range 401P
Paintwork 296
Panic alarm* 76
Panic button on SmartKey 76
Parcel net
In front passenger footwell 245
Parking 54, 267
Parking brake 48, 54
Engaging 54
Message in display 315
Releasing 48
Parking lamps
Messages in display 325
Parking lamps, front
Replacing bulbs 345
Parking lamps, rear
Replacing bulbs 345
Parking position*
Exterior rear view
mirrors 108, 148, 170
Parts service 374