2010 AUDI S6 engine coolant

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Checking and filling
Engine hood
Releasing the engine hood
The engine hood is released from inside the vehicle.
-Open the driver's door.
Fig. 205 Driver's side
footwell: engine hood
release lever
- Pull the release lever on the left under the instrument
panel => fig. 205 in the direction of the arrow.
The hood pops up slightly under spring pressure. •
Opening the engine hood
Fig. 206 Release lever
under the engine hood
Before opening the engine hood, make sure that the wind­
shield wipers are flat against the windshield. Otherwise, they
could damage the paint on the hood.
Pull up on the release under the hood=> fig. 206. This
releases the catch =>
&.
- Open the hood all the way.
& WARNING
Hot engine coolant can burn you.
• 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. •

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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.
Safety first
& 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 Technical data

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Engine cooling system
Coolant
The engine coolant performs two functions: it keeps the
engine from o ve rheat ing and it prote cts the engine from
free zing in the winter .
The cooling system is sealed and genera lly requ ires little attention .
Th e cooling system has been fi lled a t the factory w it h a permanent
coo lant which does not need to be changed. The coolant consists of a
mixture of water and the man ufacturer's glycol-basedcoo lant add i­
tive Gl2++ a ntifreeze with ant i corrosion additives (50% for USA
mode ls; 60% for Canadian mode ls). This mixture bot h assures the
necessary frost protec tion and p rotects metal components i n the
engine's cooling system from corrosion and scaling . It a lso ra ises the
boiling point of the coolant.
Do not reduce the concentration of the coolant in the summer by
adding p lai n water .
The proport ion of coolant additive must be at
least 50 % but not more than 60 %
to maintain antifreeze protection
and coo ling efficiency. If the coolant frost protect ion is too low, the
coo lant co uld freeze and damage the veh icle heating and eng ine
cooling system .
For year-ro und d riving, antifreeze is added at t he factory for temper­
atures down to:
• - 31°F( -35°C)USA
• - 40 °F ( -40 °C) Canada .
You can mix the G12 ++ coo lant additive with other add it ives (G12 + or
G 12) . Always check with yo ur a utho rized Aud i dea ler .
& WARNING
Before you check anything in the engine compartment, always
read and heed all WARNINGS=>
& in "Working in the engine
compartment " on
page 277.
0 Note
• Before winter sets in, have the coolant checked to see if the
coo lant additive in you r vehicle is s ufficient to meet the climate
condi tions. This is especially important if you live in a region where
the winter is extreme ly cold. If necessary, increase the proport ion of
c oo lan t add it ive to 60%.
• When adding coolant additive to your cooling system, remember:
- We recommend using only coo lant add it ive G 12++ (check the
label) for your vehicle . This coolant additive is available at autho­
r ized A ud i deale rs. Othe r ty pes of antifreeze can s ignifica ntly
reduce corrosion protection. The resulting corrosion can cause a
loss o f coolant and serious engine damage .
• Do not add any type of radiator leak sealant to you r vehicle's
eng ine coolant. Adding rad iator repair fl uid may adversely affect the
function and performa nce of your coo ling system and could resu lt in
d a mage not covered by your New Vehicle Limi ted W arranty. •
Checking the engine coolant level
The engine coolant level can be checked with a quick
glance .
Fig. 211 En gine
compa rtm ent : C oolant
ex pa nsio n tank ..

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Before you c hec k anythi ng in the engine compartment,
alwa ys r ead and heed all WARNINGS==> & in "Working in
the engine compartment" on
page 277.
- Turn off the ignition.
- Read the engine coolant level from the coolant expansion
tank==>
page 284, fig. 211. With a cold engine, the
coolant level should be between the "min" and "max"
markings . When the engine is wa rm, the level may be
sligh tly above the "max" marking .
The locat io n of the coolant expansion tank can be seen in the engine
compartment ill ustration ~
page 278.
To obta in an accurate reading, the engine must be sw itched off.
The expans ion tank in your vehicle is equ ipped with an electric coolant
level sensor .
When the coolan t level
is too low, the warn ing light in t he Au to-Che ck
System ~
page 2 7 will blink until you add coo lant and the level has
bee n restored to normal. Even though the re is an elect ric coolan t
level sensor, we still recommend you check the coolant leve l from
time to time .
Coolant loss
Coolant loss may ind icate a leak in the cooling system. I n the event of
coo lant loss, the cooling system should be inspected immed iately by
yo ur au tho rized A ud i dea le r.
It is not enough mere ly to add coolant.
In a
s e a le d system, losses can occur only if the bo iling point of the
coo lant is exceeded as a resu lt of overheating .
0 Note
Do not add any type of radiator leak sealant to your vehicle's engine
coo lant. Add ing radiator repa ir fluid may adverse ly affect the func­
tion and performance of your cooling system and could result in
damage not covered by your New Vehicle Limited Warra nty. •
Safety first
Adding coolant
Be very careful when adding engine coolant.
B efore you check a nything in t he engine compartment,
always read and heed all WARNINGS==> & in "Working in
the engine compartment" on
page 2 77.
- Turn off the engine.
- Let the engine cool down .
- Place a th ick rag over the coolant expansion tank
==>
page 284 , fig. 211 and carefully twist t he cap counter­
clockw ise ==>& .
- Add coolant .
- Twist the cap on again
tightly .
Replacement eng ine coolant must conform to exact spec ifications
~ page 284, "Coolant". Even in an emergency, if coolant additive
G 12++, G12+ or G12 is not available, do
not use a different addi tive .
Use plain water instead until you can get the correct additive and can
restore the correc t ratio. This should be done as soon as possible.
If you have lost a considerable amount of coolant, then you should
add co ld antifreeze and cold water only when the eng ine is co ld .
Always use
new engine coo lant w hen refilling.
Do not fill coolant above the "MAX" mark. Excess coolant will be
forced ou t th rough the p ress ure relief v alve in the cap when the
engine becomes hot .
& WARNING
• The cooling sy stem i s under pres su re a nd can get very hot.
Reduc e the ri sk of scalding from hot coolant by following the se
steps.
-Tu rn off the engine and allow it to co ol d own . _,.
Vehicle care Technical data

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& WARNING (conti nu ed )
- Prote ct your face , hand s and arms from escaping fluid and
steam by covering the cap with a larg e, thick rag .
- Turn the cap slowly and ver y carefully in a counter-clockwise
direction while applying l ight, downward pre ssure on the top
of the cap.
- To avoid being burned, do not spill ant ifreeze or coolant on
the e xhaust system or hot engine parts. Under certain condi­
tions, the ethylene glycol in engine coolant can catch fire .
• Antifreeze is poisonous. Always store antifreeze in its original
container and well out of the reach of children .
• If you drain the coolant, it mu st be caught and safely stored in
a proper container clearly marked "poison ".
0 Note
• Coolant pollutes the environme nt and could cause an eng ine fire.
Excess coo lant w ill be forced o ut throug h the pressure re lie f va lve in
the cap when the eng ine becomes hot .
• If , in an emergency, only wate r can be ad ded, the co rrect ratio
between water and antifreeze=.-
page 284 must be restored as soon
as possib le .
~ For the sake of the environment
Dra ined coolan t should no t be reused. A lways dispose of used coolant
w hile observ ing a ll enviro nmental regula tions .•
Radiator fan
The radiat or fa n sw itches on aut oma ticall y by itself .
The radiato r fa n is d rive n by t he eng ine v ia the V-bel t. T he viscous
cl utch regu lates the speed of t he fan according to the tempe rature of
the coolant . An auxiliary e
lectric rad iator fan* sw itches on and off depend ing o n
c oo lant tempe rature and other vehicle o per at ing condi tions.
After you sw itch the eng ine off, the aux iliary fa n can con tinue running
for up to 10 m inutes -even w it h the ignition off. It ca n even switch on
agai n later by itse lf ::::.- & , if
• the tempera ture of the engine coolant rises due to the heat build­
up fro m the eng ine in the eng ine comp artme nt, or
• the engine compartment heats up because the vehicle is par ked in
in tense s unligh t.
& WARNING
• To reduce the risk of personal injury never touch the radiator
fan .
• The auxiliary electric fan is temperature controlled and can
switch on suddenly even when the engine is not running .
• The auxiliary radiator fan switches on automatically when the
engine coolant reaches a certain temperature and will continue to
run until the coolant temperature drops .•

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& WARNING (conti nu ed )
• The engine compartment of any motor veh icle is a potentially
hazardous area . Never reach into th e area around or touch the
radiator fa n. It is temperature controlled and can switch on
s uddenly -even when the engine is off and the ignition key has
been remo ved. The radiator fan switches on autom atically when
the coolant rea ches a certain temperature and will continue to run
until the coolant tempe rature drops.
• Always remove the ignition key before anyone gets under the
vehicle.
• Always support your vehicle with safety stands if it i s neces sary
to work unde rne ath the vehicle. The jac k supplied with the vehicle
is not adequate for thi s purpose and could collap se cau sing
serious personal injury.
• If you must work underneath the vehicle w ith the wheels on
the ground , always ma ke sure the vehicle is on level ground , th at
the whe els are alway s securely blocked and that the engine cannot
be started .
• Always make sure the transmi ssion selector l ever (automatic
tran smission) is in "P" (Park position ) and the par k brake is firmly
applied.
W For the sake of the environment
• Changing the engine settings will adversely affect e miss io n levels.
Th is is detrimenta l to the environment and increases fuel consump­
ti on.
• Always observe enviro nmental regulations when disposing of old
eng ine o il, use d brake fl uid, dirt y engine coo lant, s pent ba tt er ies or
worn out t ires.
• Undep loyed a irbag modules and pretens ioners migh t be classified
as Perchlorate Mater ia l -spec ial handling may apply, see
www.dts c.ca .g ov/h azar douswas te/pe rchlo ra te . When the veh icle or
parts of the rest raint system including a irbag modu les sa fety belts
w ith pretens ioners are sc rapped, all applicable laws and regulat io ns must be observed
. Your authorized Aud i dealer is familiar with these
re qui remen ts and we recomme nd that you have your dealer perfo rm
this serv ice for you .•
Additional accessories,
modifications and parts
replacement
Additional accessories and parts
replacement
A lway s con sul t an autho rized Audi dealer before
purchasi ng a ccess ories.
Your vehicle incorporates the latest safety design feat ures ens uring a
hig h stand ard of active and passive s afe ty.
T hi s safety co uld be compromised by no n-app roved changes to the
vehicle. Fo r this reason, if parts have to be replace d, p lease observe
the following points when installing addit ional accessories :
Approved Audi accessories and genuine Aud i parts are available from
a u thor ized Aud i deal ers.
T hese dea lers a lso have the necessary fac ilities, tools and tra ined
speci alists to inst all the parts and ac cessor ies p ro p er ly.
& WARNING
Using the wrong spar e parts or u sing non-approved ac ce ss ories
can cause damage to the vehicle and serious personal injury .
• Use only acces sories expressly approved by Audi and genuine
Audi spare parts
• The se parts and acces sorie s have been specially designed to be
used on your vehicle . _,.

-Alphabetical inde x _ ___,_ ______ .::..:....=.:..:..__ __________________________ _
A Temporarily turning off .......... . 124
warning/indicator lights .... ...... . 127
Danger of fitting a child safety seat on the
front passenge r seat ............
197
Accesso ries ..... ...... ............. 346 Adaptive Light ......... ....... .. .. .. 61 Disposal .................. .. .... 209
Adapter for cupholder ................ 89 defective ........................ 32 Front airbags ......... ... .... 199, 200
Adaptive Air Suspension ... .......... 166
Automatic mode .. .. ... .... ...... 167
Comfort mode ................... 167
Description ..................... 166
Dynamic mode ... .. ... ...... .... 167
Jacking mode when changing a flat tire ...
168
Lift mode ....................... 167
Setting the driving modes ...... ... 167
Tr ailer towing mode .............. 168
Warning/indicator lights .... ....... 16
Adaptive Cruise Contro l ...... ...... .. 119
Changing speed ..... ............. 123
Driver information ............ .. .
Driver intervention prompt ...... . . Adding
Engine coolant ........... ...... .
285
Engine oil ............ ...... ..... 282
Windshield washer fluid ........... 292
Additional accessories ............... 346
Additives
Engine oil ............ .. .........
282
Adjusting
Instrument cluster illum ination .....
11
Steering column electrically ........ 107
Steering column manually .. .. .. .. . 106
Adjus ting front seats .......... ... .. .. 75
Air conditioning
See Climate controls ...............
96
Air distribution How do the front airbags work?
.....
204
How many airbags does my vehicle have? .
202
How the Advanced Airbag System compo -
nents work together ............
203
Important things to know ... .. .. .. 195
Indicator light ................... 206
Monitoring ... ................. . 206
PASSENGER AIR BAG OFF light ..... 207
Repairs ............ .. .. .. .... .. 209
Safety instructions .............. . 208
Side airbags .... .... ............. 211
Side curtain airbags .............. 214
Weight-sensing mat ..............
218
When must the system be inspected? 206
All Wheel Drive ... ... .. .......... ... 246 Dr iv ing in traffic ................ .
Driving program .. ...... ........ .
127
130
120
131
Climate controls 100 Alloy wheels ................. .... .. 263
Error messages . .. .. .... ........ .
Open road ... .. .. .. .. ....... ... . 129 Air pollutants filter
120 Climate controls .................. 96
All-wheel drive
Winter tire s .....................
309
Override ...................... .. 120 Airbag
Alternator
Request for driver to assume control
120 Warning/indicator lights ..... ...... 14 Malfunction ..... . .. .............. 26
Save speed . ...... .. .. ........... 122 Airbag system .................. 195,212 Amb ience lighting
Sett ing distance .. ...... ...... .. .
125 Advanced Airbag System .......... 199 Lighting profiles .. .. .............. 64
Sett ing time interval .............. 125 Advanced Airbag System components 202 Anti-freeze
Sett ings ..................... ...
131 Care ... .. .......... ..... .. .. .. . 209 See Engine coolant system ......... 284
Special driving situations .......... 131
Status messages ................. 129
Switching on and off .............. 122
System limits ................ ... 131
Chil d restraints .................. 219
Children ........................ 218
Components (front airbags) ... ..... 202
Anti -glare inside day -night mirror .... 69, 70
Anti-lock brake system
How the ABS system works ...... ..
244
Warning/indicator lights ........... 17

-Alphabetical inde x lffi'f ___,__ ______________ _
Capacities .... ..................... 341
Car -Systems
Ambience lighting ... .............. 64
Lighting profiles . ................. 64
Car care .. .. .. ..................... 2S8
Interior ..... ............. .... .. 265
Plastic and vinyl .. .. .. .. ......... 262
Weatherstrips ................ ... 263
Care of exterior .. .... .. .. ..... ... ... 258
Cargo area
See Loading the luggage compartment ..
181
Cargo net .. .. ...... .... .. .. .. ..... . 85
Catalytic converter .................. 250
CD changer ............ .... .. .... ... 94
Center armrest adjusting .. .... .. .. .... .......... 82
Storage compartment ... .......... 82
Centra l locking
Emergency locking ............ .... 45
Cert ification .... ...... .... ......... 347
Changing a flat tire .. .. .. .. ......... 318
Changing a wheel ........... ...... .. 318
Changing engine oil .. .. ... ....... .. . 283
Chassis Undercoating . ................. .. 264
See also Adaptive Air Suspension . .. 166
CHECK button . .. .. ........ .......... 11
Checking Engine coolant level . ........... .. 284
Checking tire pressure ............ ... 300
Child restra int system anchors . ... .... 230 Child restraints
Danger of us ing child restraints in the front
seat . ... ............... .. ... .. 197
Where can I get additional information
about child restraints and their use? .. .
237
Child safety ....... ...... ... . .. .. .. . 217
Convert ible locking retractor .... .. . 227
Guidance fixtures for lower anchorages
233
Important safety instructions for using
child safety seats ......... ... .. . 220
Important things to know when driving with children ............ .. .. .. . 217
Installing a child restraint using the LATCH
system .................. ..... 234
Mounting and releasing the anchorage
hook .............. .... ....... 234
Tether anchors ...... ... .. .. .... . 235
Tether straps .............. ... .. . 23S
Child safety lock rear doors (power) ........ .. .. .. .. 47
Child safety seats ............ .. ..... 222
Booster seats .... .. .. .. .. .. .. .. . 225
Convertible child seats .......... .. 223
Convertible lock ing retractor ....... 227
Danger of us ing child restraints in the front
seat .. .... .. ........... .. .. .. . 197
How do I properly install a child safety seat in my vehicle? ........... .. .. .. . 220
In fant seats .............. .. .... . 222
Insta lling ...... .... .. .. .. ....... 227
LATCH system ....... ..... ....... 234
Safety instructions . ... .... ....... 220 Child seats
Lower anchorages . ...... ........ . 232
Cigarette lighter ................... .. 92
Cleaning Alcantara (synthetic suede) .. .. .. .. 268
Engine compartment .......... ... 269
Exhaust tail pipes . .. .. .. ......... 264
Fabrics and fabric coverings . ....... 265
Instrument pane l ... ............. 266
Interior ............. .... ..... .. 265
Leather ....... ... ... ... ..... ... 267
MMI control console .............. 265
MMI display .. .... .. ......... .... 265
Plastic and vinyl .. .. ............. 262
Plastic parts ... .. .. .......... ... 266
Safety belts .............. ... .. .. 269
Trim strips ..................... . 261
tr im strips . .. ................. .. 262
Cleaning and protection ....... .. .. .. 258
Climate control . . . . . . . . . . . . . . . . . . . . . 96
Synchronizing . ................. .. 98
Warm and cold ....... ... .. .. .. ... 96
Climate controls Air distr ibut ion ...... ...... ...... 100
Air outlets . .. ....... ...... .. .. .. 101
Air outlets (rear) ................. 102
Air recirculation . ... ............. 100
AUTO (standard setting) ............ 99 Basic settings ............ ... .. .. 104
Center vents . ............... .... lOS
Controls . . . . . . . . . . . . . . . . . . . . . . . . . 98
Defrosting/defogging ............ 100
Description .. .. ... ...... ..... .. .. 96