2011 AUDI A6 radiator

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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 279.
- Turn off the ignition.
- Read the engine coolant level from the coolant expansion
tank==>
page 286, 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 280.
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 i n th e 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 even t 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 ealed 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 279.
- Turn off the engine.
- Let the engine cool down .
- Place a th ick rag over the coolant expansion tank
==>
page 286 , fig. 2 11 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 286, "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 and 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 down . _,.
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 286 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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• oil cha nges, and
• cl ea ning or re placing th e air fi lter.
W For the sake of the environment
By regu larly ma intaini ng yo ur vehicl e, y ou h elp m ake su re th at em is­
sion standards a re mainta ined, t hus mi nimizing adverse effects o n
t he enviro nmen t. •
Important considerations for you and your
vehicle
Th e increas ing use of elect ronics, s ophistica ted fuel inje ct io n and
em ission cont rol systems, and t he generally increasing tec hnical
c omplex ity o f today' s automobile s, have s tea dil y re duced t he s cope
of maintena nce and repairs w hic h can be carr ied out by ve hicle
ow ners.
Also, safety and environmental c o nce rn s plac e very s trict
limits o n the nature of repa irs and adjustments to engine an d tra ns­
mission parts w hich an owner can pe rform .
M ain te nance, ad justm ents and r epairs us ua lly re quir e spec ia l t ools,
test ing devices an d other e quipment availab le to s pecia lly trained
wo rksh op pe rsonnel in order to assure pro per perfor mance, re li­
ability and safety of the vehicle and its many systems.
Impro per ma inte nance, adjustments and rep airs can im pa ir the ope r­
ation and reliability of your ve hicle and even void your veh icle
wa rranty . Therefo re, p ro of of se rvicing in a ccordance wi th t he ma in ­
t enance sch edul e may be a co nd it io n fo r u phold ing a possib le
wa rranty claim made w it h in the wa rranty pe riod.
Above all, operat io nal safety ca n be adve rsely affec ted, c reat ing
unnecessary r is ks for you and your passe ngers.
If in doubt abou t any serv ic ing, have it done by your authorized Audi
dealer or a ny o ther pro perly equipped a nd qualified workshop . W e
st rong ly ur ge you to give yo ur auth oriz e d Aud i dea ler the opportu nity
t o pe rform all sc heduled mainte na nce and necessary repairs. Yo ur
Safety first
dealer has the facilities, o rigina l parts and trained spec ia lists to keep
your vehi cle runni ng properly.
Performing limited maintenance yourself
The foll ow ing page s descr ibe a lim ite d num ber of proced ures whi ch
can be perfo rmed on your vehicle w it h ordina ry tools, shou ld the need
ar ise and tr ained pe rsonnel be u navailabl e. Befo re pe rforming any of
t hese p rocedures, always t horoughly read all of the applicable text
and ca ref ull y follow the ins tru ction s given . Alw ays rigoro usly o bserve
t he
WARNINGS prov ided .
Before you check anything in the engine compartment, always read
and heed all WARNINGS=>
& and=> & in "W orking in the engine
compartment" on
page 279.
& WARNING
• Serious personal injury may occur as a result of improperly
performed maintenance, adjustments or repairs.
• Always be extremely careful when working on the vehicle.
Always follow commonly accepted safety practices and general
common sense . Never risk personal injury .
• Do not attempt any of the maintenance, checks or repairs
described on the following pages if you are not fully familiar with
these or other procedures with respect to the vehicle, or are uncer­
tain how to proceed.
• Do not do any work without the proper tools and equipment .
Have the necessary work done by your authorized Audi dealer or
another properly equipped and qualified workshop .
• The engine compartment of any motor vehicle is a potentially
hazardous area. Never reach into the area around or touch the
radiator fan. It is temperature controlled and can switch on
suddenly -even when the engine is off and the ignition key has
been removed. The radiator fan switches on automatically when
the coolant reaches a certain temperature and will continue to run until the coolant temperature drops. ..
Do-it,yourself service Technical data

ffl Alphabetical index ------',.__ ___________________________________ _
Driv ing messages ...... ...... .. .. .. .. 24
Dr iv ing safely ..... .. .. .. .. ...... ... 176
Dr iving through water ... ... ... .. .. .. 252
Dr iv ing time .. ............ .......... 34
Duplica te key . .... .... .. .. .. ........ 3 7
Dust fi lter
Climate controls .. .. .. .... .. .. . ...
96
DVD player for navigation system . .. . .. . 86
Dynam ic shift program ............ .. 1 56
E
Easy entry feature . .. .. .. .. .... ..... 1 08
Electric seat adjustment
See Power seat ................... 76
Electromechanical parking brake
Emergency braking . ... .. .. .... .. .
11 5
Ma lf u nct ion . . . . . . . . . . . . . . . . . . . . . 115
Operation . . . . . . . . . . . . . . . . . . . . . . 113
Park ing .................... .. .. 114
Releasing and app ly ing ... .. ... .. .. 113
Starting off w ith a t railer ......... . 115
Warning/ind icator lights . .......... 17
Electronic differential lock (EDL)
How the system works ... .........
243
Warning/ind icator lights . .......... 17
Electroni c immobili ze r ... .... .. .. .. .. . 4 0
Electronic powe r control
(EPC) war ning/ indicato r light .. .. ... .
14
Electronic speed limiter ........ .... .. . 23
Ele ctro nic s tabiliza tion p rogram ( ESP)
How t he system wor ks ... .........
2 4 2
W arning/ind icator lights . .......... 14
Emergency braking ..... .. .. .. .. .. .. 115
Emergency closing
Power su nroof ... ... .. .. . ... ...
55, 56
Eme rgency flasher ................ ... 61
Wa rning/ind icator l ights . .. .. .. .. .. 15
Emergency locking of doors . .. .. .. .. .. 45
E mergency sta rt ing .... ..... ... .. .. . 332
Emergency towing .................. 335
Energy management ................ 249
Battery power .. .. .. .. .. .... ..... 250
Dr iver not ification ............... . 250
Engine
Compartment . ... .. .. .. .. .. .. ...
280
Coolant .. ... .. .. .. .. .... .. .. .. . 286
Hood . ... .. .. .. .... ... .. .. .. .. . 278
Starting ....... .. .. ........ . 108, 109
Starting with jumpe r cab les . .. .... . 332
Stopping ...... .............. ...
110
Engine compa rtment
Sa fety instructions . .... ... .. .. .. .
2 79
Working the eng ine compartment .. 2 79
En gine coolant system ........ .. .. .. . 286
Add ing coolant ................. . 287
Checking coo la nt level . ..... .. .. .. 286
Checking the engine coo lant level . .. 286
Ma lfu nction ... .. ..... ..... .... .. . 27
Radiator fan ....... .. ... . .. .. ... 288
E ngine coo lant tempe rature
T emperat ure gauge ............. .. . 8
Engine data ....... ...... .... .. .....
343
Engine hood
Closing .... ..... ..... .... .. .. .. .
2 79
How to re lease the hood ..... .. ... . 278
Engine oil .. ... .... ... .. . ... ... .. .. 281
Add ing .............. .... ... .. .. 284
Add itives .................. .... . 284
Changing .. ..... .......... .. .. .. 285
Checking the engine oil leve l ..... .. 2 83
Indi cat io ns and conditions requiring extr a
check ing . .. .. .. .. .............
283
Oil consumption .... ............. 282
Oil grades . .. .. .... ..... ....... . 281
Recommended oil check intervals ... 283
Specification and viscosity ..... .. .. 28 1
Engine oil leve l .... .. .. ............. . 31
Engine oil p ress ure
Mal fu nct ion .. .. .. .. .... ..........
28
Engine oil sensor defect ive . ...... ... .. 31
Engine speed limitation ....... ... .. .. . 32
Environmen t
Bre ak-in per iod ...... ...... .. .. ..
2 51
Ca taly tic converte r .. .... ......... 2 52
Disposing o f you r vehi cle bat tery .... 29 4
Driving at hig h speeds ..... ... . ... 254
Driving to minimize poll ution and noise . .
253
Fuel .. .. .... ....... ...... .... .. 27 5
Fue l economy .. .. .. ....... .. .. .. 2 53
Leaks unde r yo ur vehicle ... .. .. .. . 2 79
Lett ing the vehicle stand and warm up .. .
254
Proper disposa l of dra ined brake fluid 289
Prope r disposal of dra ined engine coo la nt
287
Proper disposal of drained engine oil 284,
285
Recy cling used e ng ine o il .......... 2 8 4

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Unleaded fuel .... .... ... .. .. . .. . 273
What should I do with an old battery? ...
294
EPC
See E lectronic power control ........ 14
ESP
See Electronic stabilizat ion program (ESP)
14
Event Data Recorder (EDR) ............ 242
Exhaust tail pipes
Cleaning ................ .... .... 266
Expansion tank ..................... 286
Ex terior lighting in the mirror housing ... 61
Eyeglass es compa rtment .............. 9S
F
Fan
Radiator ............... .. .. .. .. . 288
Fastening Booster seats .................... 227
Convertible child safety seats .. ..... 225
Infant seats .............. .... .. . 224
Fastening eyelets .................... 84
Flat tire Changing . .. ........... ...... .. . 320
Floor mats ......................... 182
Fog lights ................. ........ . 60
Folding master key with remote control .. 3 7
Foot pedals .. .. ... ........ .. .. .. .. . 182
For the sake of the environment
Gasoline fumes and the environment 27S
Letting your engine warm up ...... . 109
Controls and equip­
ment Safety first
Reducing engine noise
by early upshifting
8
Refueling . .. ..... .. .. .. ......... 2 7 5
Saving fuel by early upshifting ........ 8
Using the rear window defogger ..... 101
Front airbags Descript ion . ...... .. .. .. .. ....... 201
How they work ................. .. 206
Front ashtray ........................ 91
Front fog lights .. ................. .. . 60
Front seats ... .. ..... ...... ...... .. . 75
Adjusting .. .. .. ........ ......... 179
Chi ld restraints in the front seat . ... 199
Fro nta l collisions and the laws of physics 188
Fuel Additives .... .. .... .. .. ......... 273
Blended gasoline ................. 273
Consumption ............ .... .. .. . 34
Filler neck ....................... 274
Fuel gauge ...... ............. .... 10
Gasoline ..................... ... 273
Gasoline additives ................ 274
Low fuel leve l . . . . . . . . . . . . . . . . . 10, 30
Octane rating . .. ................. 273
Recommendation . ......... .... .. 273
Refuelling ....... .... .. .. ....... 275
Reserve .................. ... .. .. . 10
T ank capacity .................... 343
Unlocking the fuel filler flap by hand . 277
Fuses Replacing ....................... 327
G
Garage door opener (Homelink ®) ...... 171
Gas discharge lamps ................. 330
Gauges Engine coolant temperature .......... 8
Fuel gauge .. .... .. .. .. ........... 10
Speedometer ............ ... ... ... 10
T achometer ... .................... 9
T rip odometer .................. .. 10
General illust ration
Instruments and controls ... .. . ... .. . 7
Glossary of tire and loading terminology 296
Glove compartment ... ... ... ..... .... 94
cd changer .... .. .. ............... 94
emergency unlocking ........... ... 94
Valet key function .. .... ........... 40
Gross Veh icle We ight Rating (GVWR) ... 341
H
Head restraints .................. .. . 181
Adjusting ............... ... ... .. 181
Front seats ... .................... 81
Rear seats ....... ................ 81
Headlight washer reservoir . .......... 294
Headlights .................. .. .. .. .. 58
Adaptive Light ...... ...... .. .. .. .. 61
Defective . .. .. .... ............... 21
Front fog lights ....... ..... .... ... 60
Headlight range control defect ive .... 31
Switching off .............. ....... 58
Switching on ................... .. 58
Vehicle operation Vehicle care Do-it-yourself service Technical data

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Question
What happens to unbelted occupants? 189
Why safety belts? ............. ... 187
R
Radiator fan ................... ... . 288
Rain sensor .. .. .. ......... ...... .. .. 66
Rain sensor defective ............. .... 30
Reading lights Front ............................ 63
Rear ........ .. .. .. .. .. ... ....... 64
Rear ashtray . .. .. ............... .. .. 91
Rear fog lights ......... ...... .. .. .. .. 60
Rear lid
Escape handle ... .. .............. 318
Opening and closing .. .. ........... 46
Valet key function ............ ..... 40
Rear light Defective .......... .... .. .. .. .. .. 21
Rear seat bench .............. .. .. .. .. 83
Rear view camera Parking mode 2 ... ........... .... 165
Parking mode 1 .............. .... 164
Rear view mir ror
Ins ide rear view mirror . . . . . . . . . 69, 70
Rear window defogger ........... .... 101
Rear window shelf .................... 80
Rear window sun shade .. .. ........... 65
Red symbols .............. ...... .. .. 25
Refuell ing . .. ............... .... .. . 275 Remote control garage door opener
(Homel ink ®) . .. .. .. .... .. .. .. .. 171
Remote control key . .... .. .. .......... 38
Unlocking and locking .. .... .... .... 42
Remote rear lid release ............ ... 46
Repa ir manua ls .. .. ........ ....... .. 346
Repairs Airbag system ................... 211
Replacing light bulbs .. . .. .. ......... 330
Replacing tires and wheels ....... .. ... 308
Replacing windshield wiper blades ... ... 68
Reporting Safety Defects ........ 185, 186
Reset button .......... .............. 10
Residual heat . .. ... ................ . 98
Retractor . ....................... .. 191
Rims Cas t alloy .. .. .. ................. 265
Roof rack ................... ... .. .. . 87
Loading ................. ... .. .. . 88
Mounting locations .... ............ 88
Roof weight ... ............. .. .. .. .. . 88
s
Safe dr iving habits ... .. .. .. .. .. ..... 176
Safety belt position .. .. .. .. ......... 192
Safety belt height adjustment .. ... . 194
Safety belts worn by pregnant women .. .
193
Safety belt pretensioner Service and disposal ............ .. 196
Safety belt pretensioners .. .. .. .. ..... 195
Release lever for hood ...... .. .. .. .. . 2 78 Safety belt warning light . . . . . . . . . 15, 187 Safety belts ......
... ... . .. .. .. .. .. . 191
cleaning ............ ... .. .. .. ... 271
Danger to passengers who do not wear a safety belt ......... ... .. .... ... 189
Fastening ....................... 191
height adjustment ... .. .... .... .. . 194
Improperly worn . .. .............. 195
Not worn ... ............. ...... . 189
Safety belt position . .... ... .. . ... . 192
Safety instructions ... . .. .. .. .. .. . 190
Securing child safety seats ...... ... 229
Special considerations for pregnant women ........... .... .. .. .. ... 193
Unfastening .... .... .. .... .. . ... . 194
Warning/indicator light .......... . 187
Why YOU MUST wear them . ... .. .. . 187
Worn properly .............. .. ... 190
Safety compliance sticker .... . ........ 340
Safety equipment ...... ...... .. .. .. . 176
Safety features for occupant restraint and protection ... .. .. .............. 176
Safety guidelines Seat adjustment ................. . 75
Safety instructions Engine compartment ...... .... .. . 279
for side curtain airbags ............ 218
for using child safe ty seats .. .. .. .. . 222
for using safety belts ........ .. ... 190
Monitoring the Advanced Airbag System .
210
Safety lock Ignition key, automatic transmission 109
Controls and equip­
ment Safety first Vehicle operation
Vehicle care Do-it-yourself service Technical data