2010 MERCEDES-BENZ CLS cooling

G
Warning!
In order to avoid any potentially serious burns:
R 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 indicator
indicates that the coolant is overheated.
R Do not remove the cap on the coolant
expansion tank if the coolant temperature
is above 158‡ (70†). Allow the engine to
cool down before removing the cap. The
coolant expansion tank contains hot fluid
and is under pressure.
R Using a rag, slowly open the cap
approximately 1
/ 2 turn counterclockwise
to relieve excess pressure. If opened
immediately, scalding hot fluid and steam
will be blown out under pressure.
R Do not spill antifreeze on hot engine parts.
Antifreeze contains ethylene glycol which
may burn if it comes into contact with hot
engine parts. X
Using a rag, slowly open cap :
approximately 1
/ 2 turn counterclockwise
to relieve excess pressure.
X Continue turning cap : counterclockwise
and remove it. The coolant level is correct if the level
R
for cold coolant: reaches marking bar
= in coolant expansion tank ;
R for warm coolant: is approximately 0.6 in
(1.5 cm) higher
X Add coolant as required.
X Screw cap : back on and tighten it.
For more information on coolant, see the
“Technical data” section ( Y page 297) and
(Y page 300). Washer system and headlamp
cleaning system
G
Warning!
Washer solvent/antifreeze is highly
flammable. Do not spill washer solvent/
antifreeze on hot engine parts, because it may
ignite and burn. You could be seriously
burned.
! Always use washer solvent/antifreeze
where temperatures may fall below
freezing point. Failure to do so could result
in damage to the washer system/fluid
reservoir.
! Only use washer fluid which is suitable for
plastic lenses. Improper washer fluid can
damage the plastic lenses of the
headlamps.
! Do not use distilled or deionized water in
the washer fluid reservoir. Otherwise, the
washer fluid level sensor could be
damaged.
Fluid for the washer system and the headlamp
cleaning system is supplied from the washer
fluid reservoir.
During all seasons, use MB Windshield
Washer Concentrate “MB SummerFit”. Mix it
with water or premixed washer solvent/
antifreeze depending on the ambient
temperature ( Y page 302). Engine compartment
181Operation
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Engine
Display messages
Possible causes/consequences and
X Solutions=
(USA only)
;
(Canada
only) Engine
Service There may be a malfunction in
R
the fuel management system
R the ignition system
R the exhaust system
R the fuel system
X Have the engine checkedas soon as possible at an
authorized Mercedes-Benz Center. ; Display
Malfunctio
n
Service
Required Certain electronic systems are unable to relay information to
the control system. The coolant temperature display or the
tachometer may have failed.
X
Have the electronic systems checked at an authorized
Mercedes-Benz Center. + Top Up
Coolant
See
Operator’s
Man. The coolant level is too low.
X
Add coolant (Y page 180).
X If you have to add coolant frequently, have the cooling
system checked at an authorized Mercedes-Benz Center. G
Warning!
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 could 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 engine damage. Vehicle status messages in the multifunction display
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Display messages
Possible causes/consequences and
X Solutions? Coolant
Stop
Vehicle,
turn
engine
off. The poly-V-belt could be broken.
X
Stop the vehicle immediately as soon as it is safe to do so.
X Turn off the engine immediately.
X Check the poly-V-belt.
X If it is broken: Do not continue to drive. Otherwise the
engine will overheat due to an inoperative water pump
which may result in damage to the engine. Contact an
authorized Mercedes-Benz Center.
X If it is intact: Do not continue to drive the vehicle with this
message displayed. Doing so could result in serious engine
damage that is not covered by the Mercedes-Benz Limited
Warranty.
X Observe the coolant temperature indicator in the
instrument cluster.
X Drive to the nearest authorized Mercedes-Benz Center
immediately. ? The radiator cooling fan is malfunctioning.
X
Observe the coolant temperature indicator in the
instrument cluster.
If

the coolant temperature is below 248‡ (120†), you may
continue driving to an authorized Mercedes-Benz Center.
X Avoid placing heavy loads on the engine (e.g. by driving
uphill) as well as stop-and-go traffic.
X Have the fan replaced as soon as possible. # The battery is no longer charging.
Possible causes:
R
alternator malfunctioning
R broken poly-V-belt
R a malfunction in the electronic system
X Stop immediately in a safe location or as soon as it is safe
to do so and check the poly-V-belt.
X If it is broken: Do not continue to drive. Otherwise the
engine will overheat due to an inoperative water pump
which may result in damage to the engine. Contact an
authorized Mercedes-Benz Center.
X If it is intact: Drive to the nearest authorized Mercedes-
Benz Center immediately. Adjust driving to be consistent
with reduced braking responsiveness. Vehicle status messages in the multifunction display
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Engine
Problem
Possible causes/consequences and
X Solutions= (USA only)
; (Canada only)
The yellow engine
malfunction indicator
lamp comes on when
the engine is running. There may be a malfunction in
R
the fuel management system
R the ignition system
R the emission control system
R systems which affect emissions
Such malfunctions may result in excessive emissions values and
may
switch the engine to limp-home (emergency operation) mode.
X Have the vehicle checked as soon as possible at an authorized
Mercedes-Benz Center.
i Some states may by law require you to visit a workshop as
soon

as the engine malfunction indicator lamp comes on. Check
local requirements. = (USA only)
; (Canada only)
The yellow engine
malfunction indicator
lamp comes on when
the engine is running. 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.
X
Check the fuel cap ( Y page 176).
X If it is not closed properly: Close the fuel cap.
X If it is closed properly: Have the fuel system checked by an
authorized Mercedes-Benz Center. ?
The red coolant
temperature
warning lamp
comes on when
the engine is
running. There is insufficient coolant in the reservoir.
If this warning lamp comes on frequently, there is a leak in the
cooling system.
If the coolant level is correct, the electric radiator fan may be
broken.
X
Immediately add coolant to prevent engine from overheating
(Y page 180).
X Have the cooling system checked.
X If the coolant temperature is below 248‡ (120†), you can
continue driving to the nearest authorized Mercedes-Benz
Center.
X Avoid high engine loads (e.g. driving uphill) and stop-and-go
driving. What to do if …
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Model Capacity Fuels, coolants,
lubricants, etc.
Engine with oil
filter
CLS 550 9.0 US qt (8.5 l) Approved engine
oils
CLS 63 AMG
33 9.3 US qt (8.8 l)
Automatic
transmission
CLS 550 9.7 US qt (9.2 l) MB Automatic
Transmission Fluid
CLS 63 AMG 9.3 US qt (8.8 l)
Rear axle
CLS 550 1.3 US qt (1.2 l) MB Hypoid Gear Oil
(SAE 85W-90)
CLS 63 AMG 1.3 US qt (1.2 l) Fuchs Titan
EG 5010 D
CLS 63 AMG
34 1.3 US qt (1.2 l) Castrol SAF-XJ
(SAE 75W-140)
Power steering
CLS 550 approx. 1.0 US qt (0.9 l) MB Power Steering
Fluid (Chevron
Texaco PSF 9109)
CLS 63 AMG approx. 1.3 US qt (1.2 l)
Brake system
All models 0.63 US qt (0.6 l) MB Brake Fluid
(DOT 4+)
Cooling system
CLS 550 approx. 11.9 US qt (11.3 l) MB 325.0
Anticorrosion/
Antifreeze
CLS 63 AMG approx. 12.5 US qt (11.8 l)
Fuel tank
All models 21.1 US gal (80.0 l) Premium unleaded
gasoline (Minimum
Posted Octane 91
[Avg. of
96 RON/86 MON])
Fuel tank
reserve
CLS 550 approx. 2.4 US gal (9.0 l)
CLS 63 AMG approx. 3.7 US gal (14.0 l)
Air
conditioning
system
All models — R134a refrigerant
and special
PAG lubricant oil
(never R 12)
Washer system
All models 4.8 US qt (4.5 l) MB Windshield
Washer
Concentrate
35
(Y page 302)
Washer fluid mixing
ratio ( Y page 302) Washer system
and headlamp
cleaning
system
All models 6.9 US qt (6.5 l)
33
Engine with oil cooler.
34 With Performance Package.
35 Mixed with water or commercially available premixed washer solvent/antifreeze. Fuels, coolants, lubricants, etc.
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After an extended period of using fuels
without such additives carbon deposits can
build up, especially on the intake valves and
in the combustion area, leading to engine
performance problems such as:
R
Warm-up hesitation
R Unstable idle
R Knocking/pinging
R Misfire
R Power loss
In areas where carbon deposits may be
encountered due to lack of availability of
gasoline which contains these additives, the
use of Mercedes-Benz approved additives is
recommended.
Contact
an authorized Mercedes-Benz Center
or visit www.mbusa.com (USA only) for a
listing of approved products. Follow
directions on the product label.
Do not blend other fuel additives with fuel.
This only results in unnecessary cost and may
be harmful to the engine operation.
! Damage or malfunction resulting from
poor fuel quality or from blending additional
fuel additives other than those tested and
approved by us for use on Mercedes-Benz
vehicles are not covered by the Mercedes-
Benz Limited Warranty or by any pre-owned
or Extended Limited Warranties. Coolants
The engine coolant is a mixture of water and
anticorrosion/antifreeze, which provides:
R Corrosion protection
R Freeze protection
R Boiling

protection (by increasing the boiling
point)
The cooling system was filled at the factory
with a coolant providing freeze protection to
approximately -35‡ (-37†) and corrosion
protection. !
Add premixed coolant solution only.
Adding

water and MB 325.0 Anticorrosion/
Antifreeze separately from each other,
could cause engine damage not covered by
the Mercedes-Benz Limited Warranty.
If the antifreeze mixture is effective to -35‡
(-37†), the boiling point of the coolant in the
pressurized cooling system is reached at
approximately 266‡ (130†).
The coolant solution must be used year round
to provide the necessary corrosion protection
and increase boil-over protection. Refer to
the Maintenance Booklet for replacement
interval.
Coolant system design and coolant used
determine the replacement interval. The
replacement interval published in the
Maintenance Booklet is only applicable if
MB 325.0 Anticorrosion/Antifreeze solution
or other Mercedes-Benz approved products
of equal specification are used to renew the
coolant concentration or bring it back up to
the proper level.
For information on other Mercedes-Benz
approved products of equal specification,
contact an authorized Mercedes-Benz Center
or visit www.mbusa.com (USA only).
To provide important corrosion protection,
the solution must be at least 50%
anticorrosion/antifreeze (equivalent to
freeze protection to approximately -35‡
[-37†]).
If you use a solution that is more than 55%
anticorrosion/antifreeze (freeze protection
to approximately -49‡ [-45†]), 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 the mixture is in accordance with
label instructions. 300
Fuels, coolants, lubricants, etc.
Technical data
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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,
contact an authorized Mercedes-Benz
Center.
Anticorrosion/antifreeze
Your vehicle contains a number of aluminum
parts. The use of aluminum components in
motor vehicle engines necessitates that
anticorrosion/antifreeze coolant used in
such engines be specifically formulated to
protect the aluminum parts. Failure to use
such anticorrosion/antifreeze coolant will
result
in a significantly shortened service life.
Therefore, the following product is strongly
recommended for use in your vehicle:
MB 325.0 Anticorrosion/Antifreeze 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 an authorized
Mercedes-Benz Center for service. Fuels, coolants, lubricants, etc.
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Model Approximate freeze protection
-35‡ (-37†) -49‡ (-45†)
Cooling system
CLS 550 6.0 US qt (5.65 l) 6.6 US qt (6.2 l)
CLS 63 AMG 6.2 US qt (5.9 l) 6.9 US qt (6.5 l)
Washer system and headlamp
cleaning system
G
Warning!
Washer solvent/antifreeze is highly
flammable. Do not spill washer solvent/
antifreeze
on hot engine parts, because it may
ignite and burn. You could be seriously
burned.
X Use MB Windshield Washer Concentrate
“MB SummerFit”.
X Mix with water for temperatures above
freezing point.
X Mix with commercially available premixed
washer solvent/antifreeze for
temperatures below freezing point.
Washer fluid mixing ratio For temperatures above the freezing point:
1 part “MB SummerFit” to 100 parts water
(1.34 fl oz [40 ml] “MB SummerFit” to 1 gal
[4.0 l] water)
For temperatures below freezing point:
1 part “MB SummerFit” to 100 parts solvent
(1.34 fl oz [40 ml] “MB SummerFit” to 1 gal
[4.0 l] solvent)302
Fuels, coolants, lubricants, etc.
Technical data
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