
Inspecting and Replenishing217
Using the systemSafetyDriving TipsGeneral MaintenanceBreakdown assistanceTechnical Data
recommend inspecting the coolant level directly at the reservoir from time
to time.
Loss of coolant
A loss of coolant is first and foremost an
indication of a leak in the
system. You should not merely top up the coolant in the reservoir. It is also
important to have the cooling system inspected without delay by a
specialist garage.
Losses can only occur through the pressure relief in the cap of the coolant
expansion bottle which is completely free of leaks if the coolant boils as a
result of overheating and is forced out of the cooling system.
WARNING
Read and observe the warning notes ⇒page 210, “Working in the
engine compartment” before working in the engine compartment.
Caution
One should contact a specialist garage as soon as possible if the source
of overheating itself cannot be determined and removed, since there may
be grave damage to the engine.
Replenishing the coolant
– Switch the engine off.
– Allow the engine to cool down.
– Place a cloth over the cap of the coolant expansion reservoir ⇒page 216, fig. 158 and unscrew the cap carefully by
turning it to the left ⇒. – Top up the coolant.
– Screw the cap tight until it is heard to lock.
The coolant which you use for replenishing the system, must comply with
one specific specification
⇒page 215, “Coolant”. Do not use an alterna-
tive additive if the coolant additive G12 PLUS is not available in excep-
tional cases. Just top up the system with water and as soon as possible
arrange adjustment to correct the mixing ratio of water and coolant addi-
tive again by a specialist garage.
Only use fresh coolant for topping up the system.
Do not fill up over the “MAX” marking! Excess coolant which is heated up
is forced out of the cooling system through the pressure relief valve in the
cap of the coolant compensation bottle.
Wait until the engine has cooled down for a system which has suffered a
major loss of coolant before pouring in coolant. This is necessary to avoid
engine damage.
WARNING
•The cooling system is pressurized! Do not open the cap of the
coolant expansion bottle if the engine is still hot - risk of scalding!
•The coolant additive and thus all of the coolant is harmful to
your health. Avoid contact with the coolant. Coolant vapours are
also harmful to the he alth. It is important, therefore, to always
safely store any coolant additive in its original container out of the
reach of children - risk of poisoning!
•If any splashes of coolant get into your eyes, rinse out your eyes
immediately with clear water and contact a doctor as soon as
possible.
•You should also consult a doctor without delay if you have inad-
vertently swallowed coolant.
NKO 20 A05.book Page 217 Wednesday, June 21, 2006 1:42 PM

Inspecting and Replenishing
218
Caution
Do not continue your journey if for some reason it is not possible
under the conditions prevailing to top up with coolant. Switch the
engine off and obtain professional assistance from a specialist garage,
otherwise it could lead to severe engine damage.
For the sake of the environment
Do not re-use coolant if it is necessary to drain the coolant in the system.
It should be collected and disposed of in compliance with environmental
protection regulations.
Radiator fan
The radiator fan may switch on suddenly.
The radiator fan is driven by an electric motor and controlled by a thermo-
stat according to the coolant temperature.
The radiator fan may continue running for up to 10 minutes after the
engine has been switched off - even if the ignition is also off. It may also
switch on suddenly after a certain time, if
•the coolant temperature has risen because of an accumulation of heat
or
•the warm engine compartment is heated up additionally by strong
sunlight.
WARNING
You must therefore be aware when working in the engine compart-
ment that the fan may switch on suddenly - risk of injury!
Brake fluid
Inspecting the brake fluid level
The brake fluid reservoir is located on the left of the engine
compartment. The brake fluid reservoir on right-hand steering
models is positioned on the other side of the engine compart-
ment.
– Switch the engine off.
– Open the bonnet ⇒ in “Working in the engine compart-
ment” on page 210.
– Inspect the brake fluid level in the reservoir ⇒fig. 159 . The
level must be between the “MIN” and “MAX” markings.
Fig. 159 Engine
compartment: Brake
fluid reservoir
NKO 20 A05.book Page 218 Wednesday, June 21, 2006 1:42 PM

Index
266
Child safety lock . . . . . . . . . . . . . . . . . . . . . . 42
Child safety seat
on the front passenger seat . . . . . . . . . 168
Safety information . . . . . . . . . . . . . . . . . 166
Child seat . . . . . . . . . . . . . . . . . . . . . . . . . . 170 Classification into groups . . . . . . . . . . . 170
ISOFIX system . . . . . . . . . . . . . . . . . . . 174
Children and safety . . . . . . . . . . . . . . . . . . . 166
Chrome parts . . . . . . . . . . . . . . . . . . . . . . . 200
Cigarette lighter . . . . . . . . . . . . . . . . . . . . . . 88
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 197
Climatronic Air outlet vents . . . . . . . . . . . . . . . . . . . 108
Defrosting windows . . . . . . . . . . . . . . . . 106
Recirculated air mode . . . . . . . . . . . . . . 107
Setting temperature . . . . . . . . . . . . . . . . 107
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Clothes hooks . . . . . . . . . . . . . . . . . . . . . . . . 95
Cockpit General view . . . . . . . . . . . . . . . . . . . . . . 11
Compartments . . . . . . . . . . . . . . . . . . . . . . . 90
Computer . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Convenience operation . . . . . . . . . . . . . . . . . 53
Converting/masking over headlights . . . . . . 192
Coolant . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215 replenishing . . . . . . . . . . . . . . . . . . . . . . 217
Warning light . . . . . . . . . . . . . . . . . . . . . . 31
Coolant level Warning light . . . . . . . . . . . . . . . . . . . . . . 31
Coolant temperature gauge . . . . . . . . . . . . . 14 Coolant temperature/coolant level
Warning light . . . . . . . . . . . . . . . . . . . . . . 31
Cornering lights . . . . . . . . . . . . . . . . . . . . . . . 56 Warning light . . . . . . . . . . . . . . . . . . . . . . 29
Correct seated position . . . . . . . . . . . . . . . . 143
Counter for distance driven . . . . . . . . . . . . . . 15
Cruise control system . . . . . . . . . . . . . . . . . 116
Cup holder front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
D
Deactivating an airbag . . . . . . . . . . . . . . . . 163
Defrosting rear window . . . . . . . . . . . . . . . . . 62
Defrosting windows . . . . . . . . . . . . . . . . 97, 101
De-icing the windows . . . . . . . . . . . . . . . . . 200
Diesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
Diesel enginesStarting the engine . . . . . . . . . . . . . . . . 112
Diesel particle filter Warning light . . . . . . . . . . . . . . . . . . . . . . 37
Digital clock . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Direction indicators . . . . . . . . . . . . . . . . . . . . 59 Warning light . . . . . . . . . . . . . . . . . . . . . . 29
Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Distance driven . . . . . . . . . . . . . . . . . . . . . . . 15
Door Child safety lock . . . . . . . . . . . . . . . . . . . 42
Warning light . . . . . . . . . . . . . . . . . . . . . . 33
Door, tailgate and bonnet ajar warning . . . . . 24 Driving economically . . . . . . . . . . . . . . . . . . 187
Driving time . . . . . . . . . . . . . . . . . . . . . . . . . . 21
E
EDL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179
Electric power-operated window
Operational faults . . . . . . . . . . . . . . . . . . . 53
Electrically adjustable rear mirror . . . . . . . . . 66
Electronic Differential Lock . . . . . . . . . . . . . 179 Warning light . . . . . . . . . . . . . . . . . . . . . . 35
Electronic Differential Lock (EDL) . . . . . . . . 179
Electronic immobiliser . . . . . . . . . . . . . . . 32, 41 Warning light . . . . . . . . . . . . . . . . . . . . . . 32
Electronic stability programme (ESP) . . . . . 177 Warning light . . . . . . . . . . . . . . . . . . . . . . 35
Emergency locking of the door . . . . . . . . . . . 46
Engine starting . . . . . . . . . . . . . . . . . . . . . . . . . . 111
switching off . . . . . . . . . . . . . . . . . . . . . . 112
Engine compartment Safety information . . . . . . . . . . . . . . . . . 210
Engine electronics Warning light . . . . . . . . . . . . . . . . . . . . . . 30
Engine oil . . . . . . . . . . . . . . . . . . . . . . . . . . . 212 change . . . . . . . . . . . . . . . . . . . . . . . . . . 215
check . . . . . . . . . . . . . . . . . . . . . . . . . . . 213
replenishing . . . . . . . . . . . . . . . . . . . . . . 214
Warning light . . . . . . . . . . . . . . . . . . . . . . 32
Engine revolutions counter . . . . . . . . . . . . . . 14
Environment . . . . . . . . . . . . . . . . . . . . . . . . 187
NKO 20 A05.book Page 266 Wednesday, June 21, 2006 1:42 PM