2007 MERCEDES-BENZ CLK350 COUPE coolant temperature

361 Practical hints
What to do if …?
ProblemPossible cause/consequenceSuggested solution
•The red coolant warning lamp
comes on when the engine is
running.There is insufficient coolant in the reservoir.Add coolant to prevent engine from
overheating (
page 310).
If this warning lamp comes on frequently,
there is a leak in the cooling system.Have the cooling system checked.
If the coolant level is correct, the electric ra-
diator fan may be broken.If the coolant temperature is below
257 °F (125 °C), you can continue
driving to the nearest authorized
Mercedes-Benz Center.
Avoid high engine loads (e.g. driving
uphill) and stop-and-go driving.
•The red coolant warning lamp
comes on while driving and you
hear a warning sound.The coolant temperature has exceeded
257 °F (125 °C).Stop as soon as possible and allow
the engine and coolant to cool down.
Warning!G
Driving when your engine is overheated 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 which can occur just by open-
ing 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.

382 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 symbolDisplay messagePossible cause/consequencePossible solution
Observe the coolant temperature indicator in
the instrument cluster (
page 26).
If the temperature rises again:
Contact an authorized Mercedes-Benz
Center immediately.
•The cooling fan for the coolant is mal-
functioning.Observe the coolant temperature indicator in the
instrument cluster (
page 26).
Have the fan replaced as soon as possible.
Warning!G
Driving when your engine is overheated 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 which can occur just by open-
ing 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). Do-
ing so may cause serious engine damage which
is not covered by the Mercedes-Benz Limited
Warranty.

383 Practical hints
What to do if …?
Display symbolDisplay messagePossible cause/consequencePossible solution
4Gas cap is openA 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 303).
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.
± Certain electronic systems are unable to
relay information to the control system.
The following systems may have failed:

Coolant temperature display

Tachometer

Cruise control display
Have the electronic systems checked
by an authorized Mercedes-Benz Cen-
ter.

448 Technical data
Fuels, coolants, lubricants, etc.
Capacities
Vehicle components and their respective
lubricants must match. Therefore only use
products tested and approved by
Mercedes-Benz.
Please refer to the Factory Approved Ser-
vice Products pamphlet, or inquire at your
Mercedes-Benz Center.
Warning!G
Comply with all valid regulations with
respect to handling, storing, and disposing
of service fluids. Otherwise you could
endanger persons or the environment.
Keep service fluids out of the reach of
children.
For health reasons, you should prevent
service fluids from coming into direct
contact with your eyes or any open wounds.
If a service fluid is swallowed, contact a
physician immediately.
ModelCapacityFuels, coolants, lubricants, etc.
Engine with oil filterCLK 350
CLK 5508.5 US qt (8.0 l)
9.0 US qt (8.5 l)Approved engine oils
Automatic transmissionCLK 350
CLK 5509.0 US qt (8.5 l)
9.5 US qt (9.0 l)MB Automatic Transmission Fluid
Rear axleCLK 350
CLK 5501.16 US qt (1.1 l)
1.27 US qt (1.2 l)Hypoid gear oil SAE 85 W 90
Power steeringapprox. 1.1 US qt (1.0 l)MB Power Steering Fluid (Pentosin
CHF 11S)
Front wheel hubsapprox. 3.0 oz (85 g) eachHigh temperature roller bearing grease
Brake system0.64 US qt (0.6 l)MB Brake Fluid (DOT 4+)

449 Technical data
Fuels, coolants, lubricants, etc.
ModelCapacityFuels, coolants, lubricants, etc.
Cooling systemCLK 350
CLK 550approx. 7.8 US qt (7.4 l)
approx. 9.7 US qt (9.2 l)MB 325.0 Anticorrosion/Antifreeze
Agent
Fuel tank
including a reserve of16.35 US gal (62.0 l)
2.11 US gal (8.0 l)Premium unleaded gasoline:
Minimum Posted Octane 91
(Avg.of96RON/86MON)
Air conditioning systemR-134a refrigerant and special PAG lu-
bricant oil (never R-12)
Windshield washer and
headlamp cleaning system*6.4 US qt (6.0 l)MB Windshield Washer Concentrate1
1Use MB Windshield Washer Concentrate “MB SummerFit” and water for temperatures above freezing point or MB Windshield Washer Concentrate “MB SummerFit”
and commercially available premixed windshield washer solvent / antifreeze for temperatures below freezing point. Follow suggested mixing ratios (page 455).

455 Technical data
Fuels, coolants, lubricants, etc.
Windshield washer system and
headlamp cleaning system*
Both the windshield washer and headlamp
cleaning system are supplied from the
windshield washer fluid reservoir.
The washer fluid reservoir has a capacity of
approx. 6.4 US qt (6.0 l).
Refill the reservoir with MB Windshield
Washer Concentrate “MB SummerFit”
and water (or concentrate and com-
mercially available premixed wind-
shield washer solvent / antifreeze,
depending on ambient temperatures).Windshield and headlamp washer fluid
mixing ratio
For temperatures above freezing point, use
MB Windshield Washer Concentrate
“MB SummerFit” and water:

1 part “MB SummerFit” to 100 parts
water
(1.34 fl oz [40 ml] “MB SummerFit” to
1 gallon [4.0 l] water)
For temperatures below freezing point, use
MB Windshield Washer Concentrate
“MB SummerFit” and commercially avail-
able premixed windshield washer
solvent / antifreeze:

1 part “MB SummerFit” to 100 parts
solvent
(1.34 fl oz [40 ml] “MB SummerFit” to
1 gallon [4.0 l] solvent)
Warning!G
Washer solvent/antifreeze is highly flam-
mable. Do not spill washer
solvent/antifreeze on hot engine parts, be-
cause it may ignite and burn. You could be
seriously burned.

460 Index
Control system menus 144
AUDIO 147
NAV* 149
Settings 151
Settings, Submenus 151
Standard display 146
Submenus 143
TEL* 165
Trip computer 163
Vehicle status message memory 149
Control system submenus 143, 145, 153
Convenience 162
Instrument cluster 154
Lighting 158
Time/Date 156
Vehicle 161
Coolant 310, 453
Adding 310
Anticorrosion/antifreeze
mixing ratio and quantity 453
Capacities 449
Checking coolant level 310
Messages in display 380–382
Temperature 302
Temperature indicator 139
Warning lamp 361Corner-illuminating front fog lamps* 133
Replacing bulbs 407
Cruise control 253
Canceling 255
Cruise control lever 253
Current speed 254
Fine adjustment 256
Higher speed 256
Last stored speed
("Resume" function) 256
Slower speed 256
Cup holder 271
Curb weight 337D
Date 156
Date, Setting 157, 158
Daytime running lamp mode 130
Setting 158
Deep water see Standing water
Defogging
Windshield 190, 200
Defrosting, Front 189, 200
Defrosting, Rear 183
Delayed shut-off
Exterior lamps 160
Interior lighting 161
Department of Transportation see DOT
Difficulties
With starting 52
Digital speedometer 146
Dimensions, Vehicle 447
Direction of rotation (tires) 316
Displays
Digital speedometer 146
Maintenance service indicator 343
Messages in display 368
Multifunction display 141
Outside temperature 140
Symbol messages 378–393

466 Index
KEYLESS-GO* 101
Battery check lamp, SmartKey 105
Factory setting 104, 106
Ignition 38
Important notes 103
Lock button 62
Locking/unlocking 35, 62, 101
Locking/unlocking,
Global setting 104
Locking/unlocking, Global with
lock button on trunk lid 106
Locking/unlocking,
Selective setting 105
Loss of key 107
Messages in display 385
Remote control 101
Start / stop button 37
Starting the engine 51
Turning off the engine 61
Unlocking/opening trunk lid 107
Kickdown 172
Kilopascal 338L
Labels 438
Certification 438
Emission control information 439
Vacuum line routing diagram 439
Lamp sensor see Light sensor
Lamps, exterior 407
Light sensor 386
Messages in display 387–390
Lamps, indicator and warning
ABS 27, 356
Battery (SmartKey) 100, 105
Brakes 27, 358
Center console 366–367
CHECK ENGINE 359
Coolant 361
Coolant temperature 27, 139
Distance warning 27
Engine diagnostics 359
Engine malfunction 27, 359
ESP
®27, 362
Fog lamps 132
Front passenger front air bag off 69
Front passenger front
air bag off indicator lamp 366
Fuel reserve 27, 363High beam headlamp 27
Instrument cluster 356–365
Low beam headlamps 27
Parktronic system* warning indicators
(Canada only) 259
Seat belt telltale 27
SRS 27, 65, 365
Turn signals 27
Language, Setting 154
LATCH-type child seat anchors
see Children in the vehicle
License plate lamps
Messages in display 388
Replacing bulbs 407, 412
Light alloy wheels, cleaning 352
Light sensor
Messages in display 386
Lighter see Cigarette lighter
Lighting, Exterior and interior 128
Limp-home mode 178
Loading
Ski sack* (Canada only) 262
Loading see Vehicle loading
Loading the vehicle 316
Locator lighting 131, 159