2009 AUDI S6 radiator cap

& WARNING
• Always observe the warnings in => page 293, "Engine compart­
ment", before opening the hood and checking the brake fluid.
• Driving with low brake fluid is a safety hazard . Stop the car and
get professional assistance.
• USA models : If the BRAKE warning light and the -warning
light come on together, the rear wheels could lock up first under
hard braking . Rear wheel lock-up can cause loss of vehicle control
and an accident. Have your vehicle repaired immediately by your
authorized Audi dealer or a qualified workshop. Drive slowly and
avoid sudden, hard brake applications.
• Canada models: If the brake warning light «D> and the ABS
warning light come on together, the rear wheels could lock up first under hard braking. Rear wheel lock-up can cause loss of
vehicle control and an accident. Have your vehicle repaired imme­ diately by your authorized Audi dealer or a qualified workshop .
Drive slowly and avoid sudden, hard brake applications. •
Engine cooling system malfunction _t
A malfunction in the engine cooling system must be
repaired as soon as possible.
When the -t symbol in the display blinks, then either the
engine coolant
temperature is too high, or the coolant level
is too low. An additional driver message can also be
displayed by pressing the [
CHECK] button:
Switch off engine and check coolant level
- Pull off the road .
- Stop the vehicle.
- Turn off the engine.
Controls and equip ­
ment
Driver information display
Check coolant level ~ page 308.
-Add coolant if necessary~ page 309 .
Continue driving only after the engine coolant
warning/indicator light goes out.
Contact your authorized Audi dealer for assistance if
necessary.
If the engine coolant level is correct, then the radiator fan may be
the cause of the malfunction.
If the O warning symbol (alternator malfunction) also lights up on
the instrument panel=>
page 30, then the fan belt may be damaged.
& WARNING
• If your vehicle should break down for mechanical or other
reasons, park at a safe distance from moving traffic, turn off the
engine and turn on the hazard warning lights =>
page 67, "Emer­
gency flasher
A".
• Never open the hood if you see or hear steam or coolant
escaping from the engine compartment - you risk being scalded.
Wait until you can no longer see or hear steam or coolant escaping.
• The engine compartment of any vehicle is a dangerous area.
Before you perform any work in the engine compartment, turn of
the engine and allow it to cool. Follow the warning stickers
=>
page 293, "Engine compartment" .
0 Note
Do not continue driving if the -F-symbol illuminates. There is a
malfunction in the engine cooling system -you could damage your
engine .•
I • •

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•
Closing the engine hood
- Pull the hood down until the pressure from the struts is
reduced .
- Let the hood
drop down and latch in place. Do not try to
push it shut;
it may fail to engage => &.
& WARNING
A hood that is not completely latched could fly up and block your
view while driving.
• When you close the engine hood, check it to make sure the
safety catch has properly engaged. The hood should be flush with
the surrounding vehicle body parts.
• If you notice while driving that the hood is not secured prop­
erly, stop at once and close it. •
Working in the engine compartment
Be especially careful whenever you work in the engine
compartment.
Whenever you must perform any work in the engine compartment,
for example checking and filling different fluids, there is a risk of injury, burns and accidents. To prevent personal injury always
observe the following WARNINGS. The engine compartment of any
vehicle is a hazardous area
~ & .
& WARNING
To help avoid injury, before you check anything under the hood :
• Turn off the engine.
• Remove the ignition key.
• Apply the parking brake .
& WARNING (continued)
• Move selector lever to "P" (Park).
• Always let the engine cool down. Hot components will burn
skin on contact.
• To reduce the risk of being burned, never open the hood if you
see or hear steam or coolant escaping from the engine compart­
ment. Wait until no steam or coolant can be seen or heard before
carefully opening the hood.
• Keep children away from the engine compartment .
• Never spill fluids on hot engine components. They can cause a
fire.
• Never touch the radiator fan. The auxiliary electric fan is
temperature controlled and can switch on suddenly.
• Never open the coolant reservoir cap when the engine is still
warm . The coolant system is pressurized and hot coolant could
spray out.
• Protect your face, hands and arm from steam or hot engine
coolant by placing a thick rag over the cap when you open the
coolant reservoir.
• If work on the fuel system or the electrical system is necessary :
- Always disconnect the battery.
- Never smoke or work near heaters or open flames . Fluids in
the engine compartment could start a fire.
- Keep an approved fire extinguisher immediately available.
• To avoid electrical shock and personal injury while the engine
is running or being started, never touch:
- Ignition cables
- Other components of the high voltage electronic ignition system.
• If you must perform a check or repair with the engine running: -First, fully apply the parking brake, move selector lever to "P"
(Park). .,
Vehicle care
I t •

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& WARNING (continued )
-Always u se extreme caution to prevent cloth ing , jewelry, or
long hair from getting caught in the radiator fan , V-belt s or
other moving parts , or from contacting hot parts . Tie back hair
before starting , and do not wear clothing that will hang or
droop into the engine .
• Minimize exposure to emis sion and chemical hazards
::::> & .
& WARNING
California Proposition 65 W arn ing :
• Engine exhaust , some of its constituents , and certain vehicle
c omponents cont ain or emit chemicals known to the State of Cali­
fornia to cause cancer and birth defects and reproductive harm. In addition , certain fluids contained in vehi cles and certa in products
of component wear contain or emit chemicals known to the State
of California to cause cancer and birth defect s or other reprodu c­
tive harm.
• Battery posts , terminals and related ac cessories conta in lead
and lead compounds , chemicals known to the State of California
to cause cancer and reproductive harms. Wash hands after
handling.
0 Note
When adding f luids, always make sure that they are poured into the
proper container or filler ope ning, otherwise serious damage to
vehic le systems wi ll occur.
ci> For the sake of the environment
To detect leaks in time, inspect the vehicle floor pan from under ­
n eath regu larly. If you see spots fro m oil o r o th e r v eh icle flu ids, hav e
your vehicle inspected by an author ized Audi dea ler. •
Engine compartment
These are th e m ost im porta nt items th at you can ch ec k.
Fig. 238 Typical layout for containe rs, engine oi l d ipstick and engine oil filler
cap
0 Jum p star t connector( +) under a cover,( -) w ith hex
head screw .... ... .... ..... ... .. .. ........... .. 314, 357
@ B rake fluid reservoir ( ) . . . . . . . . . . . . . . . . . . . . . . . . 3 10
© C oo lant e xpansio n tank (- L ) . . . . . . . . . . . . . . . . . . . . . . 308
© Eng in e oil fill er cap ('l=:11) . . . . . • . . . . . . • . . . • . . . . . . . 30 6
© E ng ine oil d ipstick (orange) .............. ....... .
©
0
Power steering reservoir ....................... •.
Windshield/ headlight washer container( ~) ....... . 3
0 5
267
316 ~

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•
T o obtain an accurate reading, the engine must be switched off .
The expansion tank in your vehic le is equipped with an e lectric
coolant level sensor.
When the coolant level is too low, the warning light in the Auto ­
Check System ~
page 37 will blink until you add coo lant and the
level has been restored to normal. Even though there is an electric
coolant level sensor, we still recommend you check the coo lant level
from time to time .
Coolant loss
Coolant loss may indicate a leak in the cooling system. In the event
of coolant loss, the cooling system should be inspected immedi­
ately by your authorized Audi dealer . It is not enough merely to add
coo la nt.
In a sealed system, losses can occur only if the boiling point of the
coolant is exceeded as a result of overheating .
0 Note
Do not add any type of radiator leak sealant to your vehicle's engine
coolant . Adding radiator repair fluid may adversely affect the func­
tion and performance of your cooling system and could result in
damage not covered by your New Vehicle Limited Warranty. •
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the engine compartment,
always read and heed all WARNINGS~ & in "Working in
the engine compartment" on
page 301.
- Turn off the engine.
- Let the engine cool down. Place
a thick rag over the coolant expansion tank
~ page 308, fig. 242 and carefully twist the cap counter­
clockwise ~& .
Add coolant.
- Twist the cap on again
tightly .
Replacement engine coolant must conform to exact specifications
~ page 307, "Coolant". Even in an emergency, if coolant additive
G12++ , G12 + or G12 is not availab le, do not use a different additive .
Use plain water instead until you can get the correct add itive and
can restore the correct ratio. This shou ld be done as soon as
possible.
If you have lost a considerab le amount of coolant, then you should
add cold antifreeze and cold water only when the engine is cold .
A lw ays use
new engine coolant when refilling.
Do not fill coolant above the "MAX" mark. Excess coolant will be
forced out through the pressure relief valve in the cap when the
eng ine becomes hot.
& WARNING
• The cooling system is under pressure and can get very hot.
Reduce the risk of scalding from hot coolant by following these
steps.
-Turn off the engine and allow it to cool down .
- Protect your face , hands and arms from escaping fluid and
steam by covering the cap with a large , thick rag.
- Turn the cap slowly and very carefully in a counter-clockwise
direction while applying light , downward pressure on the top
of the cap.
- To avoid being burned, do not spill antifreeze or coolant on
the exhaust system or hot engine parts. Under certain condi-
tions , the ethylene glycol in engine coolant can catch fire . ...
Vehicle care
I t •

--~C~h.!. e~ c~k ~in ~ g~ a~n ~d~ f~il ~li~ n~gL ___________________________________________ _
& WARNING (continued )
• Antifreeze is poi sonous. Alway s store antifreeze in its original
container and well out of the rea ch of children.
• If you drain the coolant , it must be caught and safely stored in
a proper container clea rly marked "poi son ".
0 Note
• Coo lant po llutes the env ironment and could cause an engine
fire . Excess coolant will be forced out through the pressure relief
valve in the cap when the engine becomes hot.
• If, in an emergency, on ly wa ter ca n be added, the correc t rati o
between water and antifreeze=>
page 307 must be restored as soon
as possible .
~ For the sake of the environment
Drained coolant should not be reused. Always dispose of used
co olant whi le observ ing all e nvir o nmen tal regula tions .•
Radiator fan
The radi ator fan s wit ches on automa tically by i tsel f.
The radiator fan is driven by t he engine v ia the V -belt. The v iscous
clutch regulates the speed of the fan according to the temperature
of the coo lant .
An aux iliary e lectric radiator fan* switches on and off depending on
c oo lant temperature and other vehicle opera tin g co ndi tions.
After you switch the engine off, the aux iliary fan can continue
running for up to 10 minutes -even with the ignition off. It can even
switc h on again later by itself=>&, if
• the temperature of the engine coolant rises due to the heat
bui ld-up fr om the eng ine in the engine c ompartmen t, or •
the engine compartment heats up because the vehicle is parked
in in tense s un ligh t.
& WARNING
• To reduce the ri sk of personal injury never touch the radiator
fan .
• The auxiliary e lectric fan is temperature controlled and can
switch on suddenly even when the engine is not running .
• The au xiliary radiator fan switches on automatic ally when the
engine coolant reaches a ce rtain temperature and will continue to
run until the coolant temperature d rops .•
Brake fluid
Checking brake fluid level
T he brak e fluid level can be checked wit h a quick glance.
F ig . 243 Engine
c o mp artment : B ra ke
fluid re servoir
Befo re you c heck anything in the e ngi ne compartme nt,
always read and heed all WARNINGS=> & in "Working in
t h e e ngin e com part ment" on
page 30 1. ~

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Environment
Break -in period ... ... . .. .. ..... ... 271
Catalytic converter .... ...... ...... 272
Dispos ing of your vehic le battery ... 315
Driving at high speeds .... .... ... . 273
Dr iving to minimi ze pollution and noise .
273
Fuel ............................ 297
Fuel economy .... .... .... ....... . 273
Leaks under your vehicle ... .. ... .. 301
Letting the vehicle stand and warm up .
274
Proper disposal of drained brake fluid 311
Proper disposal of drained engine coolant ........................ 309
Proper disposa l of drained engine oil 306
Recycling used engine oi l .. .. .. .... 306
Un leaded fuel .................... 295
What should I do with an old battery?
315
EPC
See E lectronic power control ........ 18
ESP
See E lectronic stabi lizat ion p rogram
(ESP) ... ..... ...... .... ..... .... 18
Event Data Recorder (EDR) . ...... .... . 262
Expansion tank ... ... .... ..... .. .... 308
Exterior lighting in the mirror housing ... 66
E yeglasses compartment .... .... .... . 100
Controls and equip­
ment Safety first
F
Fan
Radiator .... .... .... .... ...... .. 310
Fastening eyelets .................... 90
Flat tire
Changing .... .... .... .... .... ... 344
Floor mats ......................... 200
Fog lights ...... .... .... ...... ... .. .. 65
Fo lding master key with remote contro l . 41
Foot pedals ........................ 200
For the sake of the e nvi ro nmen t
Gaso line fu mes and the environment 297
Letting your eng ine warm up ...... . 1 17
Reducing engine noise by ear ly
upshif ting ....................... 12
Re fuel ing ..... ... .... .... .... .... 297
Savi ng fuel by early upshifti ng .. .... 12
Using the rear window de fogger ... . 108
Front airbags Description .... ..... .. .... .... ... 219
How they work .... .... .... ....... 224
Front arm rest adjusting . .... ..... .. .... .... .... . 88
Storage compartment .............. 88
Front ashtray .... .... .... .... .... ... . 96
Front fog lights . .... .... .... .... ..... 65
F ront seats .. ............ .... ....... . 80
Adjusting ....................... 197
Child restraints in the front seat .... 217
F ronta l coll isions and the laws of physics
206 Fuel
Additives .. .... .... ... .... .... ... 295
Blended gasoline ...... .... .... ... 295
Consumption ........... .... ...... 38
Fi ller neck .... .... .... ... .... .... 296
Fuel gauge . ...... .... ... .... .... . 14
Gas oline ...... .... ... .... .... ... 295
Gaso li n e additives ..... ... .... .... 296
Low fuel level ..... .... ... .... .. 14, 3 4
Octane rating .. ...... .... .... .... 295
Recommendation .. .... ... .... .... 295
Refuelling .... .... .... ... .... .... 297
Reserve ... .... ... .... ... ... ...... 14
Tank capacity ..... ... .... ...... .. 369
Un locking the fue l filler flap by hand 299
Fuse ar rangement . ....... ... .... .... 35 1
G
Ga rage door opener (Homelink®) ..... . 188
Gas discharge lamps ... ... .... ... ... . 355
Gauges Engine coolant temperature .... ..... 12
Fuel gauge ... ... ....... . .... ..... 14
Speedometer . .... .... ... .... ..... 14
Tachometer ....................... 13
Tr ip odometer .. ....... .... .... .... 14
General illustration Instruments and controls . .... .... .. 11
G lossary of tire a nd loading termi nology . . .
318
G love compartment ... .. .... .... ..... 99
cd change r ... .... .... .... .... .... 99
Valet key function .... .... .... ... .. 44
Vehicle operation Vehicle care Do-it-yourself service Technical data

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quattro®
See All Wheel Drive ... .... ........ 268
Question
R
What happens to unbelted occupants? .
207
Why safety belts? ... .... .... .... .. 205
Radiator fan .. . .... .. .. .... ....... .. 310
Rain sensor ... .... .... .... .......... 71
Rain sensor defective 34
Reading lights
Front .... ... .... .... .... ..... ... .
68
Rear ..... .. .. ...... .. ... .. ... ... . 69
Rear ashtray . .... .... .... ... .... ... .. 97
Rear fog ligh ts .... .... ... .... ..... ... 65
Rear lid
Escape handle .... .... ... .... ....
342
Open ing and c losing . .... ... ..... .. 50
Valet key function .. ..... .... .... .. 44
Rear light
Defective . .... .... ... .... .. .. .... .
25
Rear seat bench ...... .... ..... .... ... 88
Rear View
See Rear-view camera . ... .... .... . 171
Rear view mirror
Inside rear view mirror . ............
75
Rear window blind
Settings ..... .... .... ... .. .. .... .
71
Rear window defogger .. .... .... .... . 108
Rear window shelf ... .... ...... ...... 86
Controls and equip­
ment Safety first
Rear
-view camera .. . .. .. .... .. .. 171, 173 Safety belt position . ... .. .... .. .. .... 210
Parking mode 1 .. .... ...... ..... . 175 Safety belt height adjustment . .... . 212
Parking mode 2 .. .. ........ .... .. 177 Safety belts worn by pregnant women
Red symbols .... .... .... .... .... ... .
29 21
1
Refuel ling ... .... .... .... .... .... ... 297 Safety belt prete nsioner
Release lever for hood .. ... ......... .
300 Service and disposal . ...... .... ... 214
Remote control garage door opener Sa
fety b elt pretensioners . .... .... .... 213
(Homelink®) ...... .... .... ... .. 188 Safety belt warning light ... .. .... . 19,205
Remote control key ... .... .... .... .... 42 Safety belts . .... .... .... ... .... .... 209
Un locking and locking ... .... .... .. 46 clea ning .. .... .... ... .... .... ... 293
Remote rear lid re leas ,e ... .... .... .... . 50 Danger to passengers who do not wear a
Repair manua ls .... ... ............ ..
372
Repa irs
Airbag system .. ...... .... .... ...
229
Replacing a fuse .... .... .... .... .... 351
safety belt .. ........ .... .... ... 207
Fastening ...... ..... .. .. ... ... .. 209
height adjustment . .... ... .... .... 212
Improper ly worn ..... ... . .. .. .... 213
Not worn . .... .... .... .... ...... . 207
Replacing light bulbs ...... ... ... .... 355 Safety belt position ... .... .... .... 210
Replaci ng tires and wheels . ...... .... 329 Safety instructions .... .... .... ... . 208
Reporting Safety Defe cts . ........ 203, 204 Securing child sa fety sea ts ..... ... . 248
Reset button . ...... .. .. .... .... .... . 14 Specia l considera tions fo r preg nant
Res idual heat . .... .... ... .... .... ...
104 women . ........ .... .. .... .... . 211
Retractor .. ... ... .. ...... .... .... .. 209 Unfastening ........ ........ ..... 212
Rims Warning/indicator light
....... ... .. 205
Cast alloy .. ...... .... .... ... .... 287
Roof rack .. ..... ... .... ... ... ... ... . 93
Why YOU MUST wear them . ..... .. 205
Worn properly . .... ... ... .. ...... 208
Loading ... ... .... .... .... ... .... . 94 Safety comp liance sticker .... .... .... 366
Mounting locat ions . ...... .... .... . 94 Safety equipmen t ... .... .... .... ... . 194
Roof weight .... .... ... ..... .... ... .. 94 Safety features for occupant restraint and
protection ...... .... .... .... ... .
194
s Sa fety guide lines
Seat adjus tment ...... .... .... .. . ..
80
SA FE .... ... .... ...... ...... .... ... . 14
Safe driving hab its ...... .... .... .... 194
Vehicle operation Vehicle care Do-it-yourself service Technical data