
Your vehicle maintenance and cleaning211
Safety First
Controls and equipment
Practical tips
Technical Data
Cleaning the engine compartment
Take special care when cleaning the engine compartment.Anti-corrosion treatment
The engine compartment and the surface of the power unit are given anti-
corrosion treatment at the factory.
Good corrosion protection is particularly important in winter when the car is
frequently driven on salted roads. To prevent the salt corroding the vehicle,
the entire engine compartment should be thoroughly cleaned before and
after winter.
Yo u r A u t h o r i s e d S e r v i ce Ce n t re has got the necessary equipment to provide
the correct cleaning and preserving products. For this reason, we recommend
having this work performed by them.
The anti-corrosion protection is usually removed if the engine compartment
is cleaned with grease removing solutions, or if you have the engine cleaned.
On commissioning this work, ensure that all surfaces, seams, joints and
components in the engine compartment are given anti-corrosion treatment.
WARNING
•When working in the engine compartment, always observe the safety
warnings ⇒page 221•Before opening the bonnet, switch the engine off, apply the parking
brake firmly and always remove the key from the ignition.•Allow the engine to cool before you clean the engine compartment.•Do not clean the vehicle underbody, wheel arches without protecting
your hands and arms. You may cut yourself on sharp-edged metal parts.
Failure to comply could result in injury.•Moisture, ice and salt on the brakes may affect braking efficiency. Risk
of accident. Directly after washing, avoid sudden and sharp braking.
•Never touch the radiator fan. It is temperature-controlled and could
start automatically, even when the key is removed from the ignition!For the sake of the environment
Fuel, grease and oil deposits could be removed when the engine is washed.
The polluted water must be cleaned in an oil separator. For this reason,
engine washing should be carried out only by a qualified workshop or a petrol
station.Vehicle interior maintenancePlastic parts and dash panel cleaning– Use a clean, damp cloth to clean plastic parts and the dash panel.
– If this does not provide satisfactory results, use a special solvent-free plastic cleaning product.
WARNING
Never clean the dash panel and the airbag module surface with cleansers
containing solvents. Solvents cause the surface to become porous. If the
airbag triggered, disintegrating plastic parts could cause substantial inju-
ries.
WARNING (continued)
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Checking and refilling levels
220The bonnetReleasing the bonnet
The bonnet is released from inside the vehicle.– To release the bonnet, pull the lever under the instrument panel
⇒fig. 167 in the direction indicated (arrow).The bonnet springs out of its lock.
Opening the bonnetBefore opening the bonnet make sure that the windscreen wiper
arms are not lifted away from the glass. Otherwise the paint may be
damaged.
– Lift the bonnet slightly ⇒.
– Press the release catch under the bonnet upwards ⇒fig. 168 .
This will release the arrester hook under the bonnet.
– Open the bonnet.The bonnet is held in position by a gas-filled strut.
Fig. 167 Detail of foot-
well area on driver's side:
lever for unlocking the
bonnet.
Fig. 168 Release catch
under the bonnet
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Checking and refilling levels221
Safety First
Controls and equipment
Practical tips
Technical Data
WARNING
Never open the bonnet if you see steam or drips of coolant being released
from t he engine com par t ment . Fail ure to com ply could resul t in burns . Wait
until no steam or coolant can be seen before opening the bonnet.Work in the engine compartment
Extra caution is necessary when working on components in
the engine compartment.Always be aware of the danger of injury and scalding as well as the risk of
accident or even fire when working in the engine compartment (e.g. when
checking and refilling fluids). Therefore, always observe the warnings listed
below and follow all general safety precautions. The engine compartment of
any motor vehicle is a potentially hazardous area ⇒
WARNING
•Switch the engine off.•Remove the ignition key.•Apply handbrake firmly.•If your vehicle is equipped with a manual gearbox, place the gearshift
lever in neutral. If you are driving an automatic vehicle, place the selector
lever in the position P.•Wait for the engine to cool down.•Children should not be allowed to approach the engine compartment•Never spill liquids involved in vehicle operations on the engine
compartment, as these may catch fire (e.g. anti-freeze containing liquid
coolant).
•Take care not to cause short circuits in the electrical system, especially
when working on the battery.•Never touch the radiator fan while the engine is hot, as the fan could
start up suddenly.•Never open the expansion tank when the engine is hot. The cooling
system is under pressure.•Protect face, hands and arms from any hot steam or hot liquid coolant
released by covering the cap with a large, thick rag when opening the
expansion tank.•If any tests have to be performed with the engine running, there is an
extra safety risk from the rotating parts, such as the drive belts, alternator
and radiator fan, etc., and from the high-voltage ignition system.•Observe the following additional warnings if work on the fuel system or
the electrical system is necessary:
−Always disconnect the battery.
− Do not smoke.
− Never work near open flames
− Always keep an approved fire extinguisher immediately available.Caution
When topping up fluids, make sure the correct fluid is put into the correct
filler opening. This can otherwise cause serious malfunctions or engine
damage.
For the sake of the environment
Inspect the ground underneath your vehicle regularly so that any leaks are
detected at an early stage. If you find spots of oil or other fluids, have your
vehicle inspected in the garage.
WARNING (continued)
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Index299
Index
AAccessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Adaptive headlights . . . . . . . . . . . . . . . . . . . . . 121
Air conditioner 2C-Climatronic . . . . . . . . . . . . . . . . . . . . . . . 154
Defrosting . . . . . . . . . . . . . . . . . . . . . . . . . . . 158
Solar-powered blower/solar roof . . . . . . . . 163
Air duct Fitting . . . . . . . . . . . . . . . . . . . . . . . . . 259, 266
Removing . . . . . . . . . . . . . . . . . . . . . . 258, 265
Air purity sensor . . . . . . . . . . . . . . . . . . . . . . . . . 159
Airbag Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . . 66
Airbag covers . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Airbag system . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 Curtain airbags . . . . . . . . . . . . . . . . . . . . . . . 41
Front airbags . . . . . . . . . . . . . . . . . . . . . . . . . 31
Side airbags . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . . 29
Alternator Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . . 69
Ambient temperature display . . . . . . . . . . . . . . . 72
Anti-freeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225
Anti-lock brake system How it works . . . . . . . . . . . . . . . . . . . . . . . . . 184
Anti-puncture tyres . . . . . . . . . . . . . . . . . . . . . . 240 Anti-theft alarm system . . . . . . . . . . . . . . . . . . . 106
Interior monitoring . . . . . . . . . . . . . . . . . . . 107
Aquaplaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Armrest Storage compartment in front armrest . . . . 141
Armrests Adjusting the front armrest . . . . . . . . . . . . . 141
Ashtray Front . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148
Rear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 149
Athermic windscreen . . . . . . . . . . . . . . . . . . . . . 215
Auto-check system . . . . . . . . . . . . . . . . . . . . . . . 75
Automatic car wash tunnel . . . . . . . . . . . . . . . . 206
Automatic gearbox Dynamic gear control program . . . . . . . . . . 180
Kick-down feature . . . . . . . . . . . . . . . . . . . . 179
multitronic® . . . . . . . . . . . . . . . . . . . . . . . . 175
Paddle levers (tiptronic mode) . . . . . . . . . . 182
Safety interlock for ignition key . . . . . . . . . 165
Selector lever lock . . . . . . . . . . . . . . . . . . . . 179
Selector lever positions . . . . . . . . . . . . . . . . 177
Steering wheel with paddle levers . . . . . . . 182
tiptronic . . . . . . . . . . . . . . . . . . . . . . . 175, 181
Automatic headlight control . . . . . . . . . . . . . . . 115
BBackground lighting . . . . . . . . . . . . . . . . . . . . . 124 Battery . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Battery voltage . . . . . . . . . . . . . . . . . . . . . . . . 81
Charging . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233
Disconnection . . . . . . . . . . . . . . . . . . . . . . . 231
Long periods of non-use . . . . . . . . . . . . . . . 231
Replacing . . . . . . . . . . . . . . . . . . . . . . 231, 232
Testing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
Winter operations . . . . . . . . . . . . . . . 231, 232
Belt tension device Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Warning lamp . . . . . . . . . . . . . . . . . . . . . . . . 29
Belt tension devices . . . . . . . . . . . . . . . . . . . . . . 26
Bicycle rack Towing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196
Biodiesel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Biodiesel fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . 218
Bonnet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 Closing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222
Opening . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Releasing . . . . . . . . . . . . . . . . . . . . . . . . . . . 220
Brake light Failure control . . . . . . . . . . . . . . . . . . . . . . . . 80
Brake pads . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Brake servo . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
Brake system Brake servo . . . . . . . . . . . . . . . . . . . . . . . . . 186
Brakes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186
Malfunction . . . . . . . . . . . . . . . . . . . . . . . . . . 77
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