2003 MERCEDES-BENZ CLK320 CABRIOLET Owner's Manual

254 Engine compartment
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Adding coolant
If coolant has to be added, a 50 / 50 mixture of water and
MB anticorrosion / antifreeze should be added.
The drain plugs for the cooling system are located on
the right side of the engine block and at the bottom of
the radiator.
Anticorrosion / antifreeze mixture, see page 321.
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.

255 Engine compartment
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Windshield washer / headlamp cleaning system
1Windshield washer/headlamp cleaning system fluid
reservoir
Capacity approx. 7.4 US qt (7.0 l).
The reservoir should be refilled with MB Windshield
washer concentrate and water (or commercially
available premixed windshield washer solvent/
antifreeze, depending on ambient temperatures).Windshield and headlamp washer
fluid mixing ratio
For temperatures above freezing:
MB Windshield Washer Concentrate “S” and water.
1part “S” to 100parts water
(40 ml “S” to 1 gallon water).
For temperature below freezing:
MB Windshield Washer Concentrate “S” and
commercially available premixed windshield washer
solvent/antifreeze.
1 part “S” to 100 parts solvent
(40 ml “S” to 1 gallon solvent).
1
P82.35-2017-26
Wa r n i n g !
Washer solvent/antifreeze is highly flammable. Do
not spill washer solvent/antifreeze on hot engine
parts, because it may burn. You can be seriously
burned.

256 Spare wheel, vehicle jack
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Spare wheel, vehicle tools, storage compartment
1Trunk floor
2Handle
3Luggage bowl
4Vehicle toolsLift trunk floor and engage handle in grip molding of
luggage cover.
To remove spare tire:
Turn luggage bowl counterclockwise and remove.
To store spare tire:
Place spare tire in wheel well and secure it with luggage
bowl. Turn luggage bowl clockwise to its stop.
Note:
Always lower trunk floor before closing trunk lid.

257 Spare wheel, vehicle jack
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Ve h i c l e j a c k
1Jack arm
2Jack base
See illustration for proper storage of jack.
Before storing the jack on the felt in the spare wheel
well, the jack arm must be lowered almost to the base of
the jack.
1
2
P40.10-2027-26
Wa r n i n g !
The jack is designed exclusively for jacking up the
vehicle at the jack tubes built into either side of the
vehicle. To help avoid personal injury, use the jack
only to lift the vehicle during a wheel change.
Never get beneath the vehicle while it is supported
by the jack. Keep hands and feet away from the area
under the lifted vehicle. Always firmly set parking
brake and block wheels before raising vehicle with
jack.Do not disengage parking brake while the vehicle is
raised. Be certain that the jack is always vertical
when in use, especially on hills. Always try to use
the jack on level surface. Be sure that the jack arm
is fully inserted in the jack tube. Always lower the
vehicle onto sufficient capacity jackstands before
working under the vehicle.

258 Tires, Wheels
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Wheels
Replace rims or tires with the same designation,
manufacturer and type as shown on the original part.
See your authorized Mercedes-Benz Center for further
information.
See your authorized Mercedes-Benz Center for
information on tested and recommended rims and tires
for summer and winter operation. They can also offer
advice concerning tire service and purchase.
Tire replacement
Front tires should be replaced in sets. Rims and tires
must be of the correct size and type. For dimensions,
see “Technical Data” (page 312).
We recommend that you break in new tires for approx.
60 miles (100 km) at moderate speed.It is imperative that the wheel mounting bolts be
fastened to a tightening torque of 80 ft.lb. (110 Nm)
whenever wheels are mounted.
For rim and tire specifications, refer to “Technical Data”
( p a g e 312 ) .
Wa r n i n g !
Worn, old tires can cause accidents. If the tire tread
is badly worn, or if the tires have sustained
damage, replace them.When replacing rims, use only genuine
Mercedes-Benz wheel bolts specified for the
particular rim type. Failure to do so can result in
the bolts loosening and possibly an accident.

259 Tires, Wheels
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Rotating wheels
CLK 430
Wheel rotation applies only when winter tires are
mounted on all four wheels.
The wheels can be rotated according to the degree of
tire wear while retaining the same direction of travel.
Rotating, however, should be carried out as
recommended by the tire manufacturer, before the
characteristic tire wear pattern (shoulder wear on front
wheels and tread center wear on rear wheels) becomes
visible, as otherwise the driving properties deteriorate.
Important!
Unidirectional tires must always be mounted with arrow
on tire sidewall pointing in direction of vehicle forward
movement.Notes:
Thoroughly clean the inner side of the wheels any time
you rotate the wheels or wash the vehicle underside.
The use of retread tires is not recommended. Retread
tires may adversely affect the handling characteristics
and safety of the vehicle.
Dented or bent rims can cause tire pressure loss and
damage to the tire beads. For this reason, check rims for
damage at regular intervals. The rim flanges must be
checked for wear before a tire is mounted. Remove
burrs, if any.
Check and ensure proper tire inflation pressure after
rotating the wheels. For tire inflation pressure see
inside of fuel filler flap and also page 268.

260 Tires, Wheels
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Spare wheel
Spare wheel bolts (CLK 320 only)
1Wheel bolt for light alloy wheel rim
2Wheel bolt for steel spare wheel rim
Note:
Wheel bolts (2) must be used when mounting steel
spare wheel rim. The wheel bolts for the steel spare
wheel rim are located near the vehicle tool kit, see
page 256.The use of any wheel bolts other than wheel bolts (2) for
the steel spare wheel rim can cause physical damage to
the vehicle.
CLK 320 (except Sport Package)
(Steel spare wheel rim)
Important!
Unidirectional tires must always be mounted with arrow
on tire sidewall pointing in direction of vehicle forward
movement.
If the arrow on tire side wall does not point in direction
of vehicle forward movement when using the spare
wheel, observe the following restrictions:
•Drive to the nearest tire repair facility as soon as
possible.
•Do not exceed vehicle speed of 50 mph (80 km/h).
For rim and tire specifications, see page 312.
12
Wa r n i n g !
Be sure to use the original length wheel bolts when
remounting the original light alloy wheel after it
has been repaired.

261 Tires, Wheels
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index CLK 320 (with Sport Package)
(Steel spare wheel rim)
Important!
The spare wheel rim size is 7 J x 16 H 2.
The dimensions of the spare wheels are different from
those of the road wheels. The spare wheel should only
be used temporarily and replaced with a regular road
wheel as quickly as possible.
The spare wheel rim is mounted with a tire of size
205/55 R 16 91 H.
In the case of a flat tire, you may temporarily use the
spare wheel only when observing the following
restrictions:
•Do not exceed vehicle speed of 50 mph (80 km/h).
•Drive to the nearest tire repair facility to have the
flat tire repaired or replaced as appropriate.
•Do not operate vehicle with more than one spare
wheel mounted.If the arrow on tire side wall does not point in direction
of vehicle forward movement when using the spare
wheel, observe the following restrictions:
•Drive to the nearest tire repair facility as soon as
possible.
•Do not exceed vehicle speed of 50 mph (80 km/h).
Unidirectional tires must always be mounted with arrow
on tire sidewall pointing in direction of vehicle forward
movement.
For rim and tire specifications, refer to “Technical Data”.
Wa r n i n g !
CLK 320 (with Sport Package):
The dimensions of the spare wheel are different
from those of the road wheels. As a result, the
vehicle handling characteristics change when
driving with a spare wheel mounted.The spare wheel should only be used temporarily,
and replaced with a regular road wheel as quick as
possible.
Do not exceed vehicle speed of 50 mph (80 km/h).