2015 AUDI A6 coolant temperature

228 Check ing and filling
- Always dispose of used engine oil proper ­
l y . Do not dump it on garden soi l, wood­
ed areas, into open streams or down
sewage dra ins.
- Recycle used engine oil by taking it to a
used engine oil collection facility in your
area, or contact a service station.
Engine cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro­ tects the engine from freezing in the winter.
The cooling system is sealed and generally re­
qu ires little attention.
The cooling system has been filled at the fac­
tory with a permanent coolant which does not need to be changed. The coolant consists of a
mixture of spec ially conditioned water and the
manufacturer's glycol-based coolant addi-
tive G13 antifreeze with ant icorros ion addi­
tives (50% for USA models; 60% for Canadian
models). This mixture both assures the neces­
sary frost protection and protects metal com­
ponents in the engine's coo ling system from
corrosion and scaling . It also raises the boil­
ing point of the coolant.
Do not reduce the concentration of the coo l­
ant in the summer by adding plain water.
The
p ropo rtion of coolant add itive must be at
l e a st 50 % but not mo re th an 60 %
to ma in­
tain antifreeze protection and cooling efficien­
cy . If the coolant frost protect ion is too low,
the coo lant cou ld freeze and damage the veh i­
cle heating and eng ine cool ing system.
For year-round driving, antifreeze is added at
the facto ry for temperatures down to:
- -31°F(-35°C)USA
- -40 °F ( -40 °C) Canada.
If you m ust add coo lant, use a m ix tu re of wa ­
ter and coo lant addit ive . M ixing the coolant
additive with disti lled water is recommended .
A WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS~ &.
in Working in the engine
compartment on page
222 .
(D Note
-Before winter sets in, have the coolant
checked to see if the coolant additive in
your vehicle is sufficient to meet the cli­ mate conditions. This is especia lly impor­
tant if you live in a reg ion where t he win ­
t er is ex treme ly cold. If necessary, in­
crease the p roportion of coo lant add it ive
to 60% .
- When adding coolant addi tive to yo ur
c ooling sys tem, remembe r:
- We recommend us ing on ly coolant ad­
d itive G12++ or G13 (check the label)
for your vehicle . This coolant additive is
ava ilable at autho rized Aud i dea le rs.
Other types of antifree ze ca n sign ifi­
ca ntly reduce co rros io n protec tion. The
res ulting corrosion c an cause a loss of
coolant and serious engine damage.
- Do not add any type of r ad iator le ak seal­
ant to yo ur vehicle 's engine coolant .
Adding radiator repair flu id may adverse­
ly affect the function and performance of
your cooling system and cou ld resu lt in
damage not covered by your New Vehicle Limited Warranty.
Checking the engine coolant level
-
The engine coolant level can be checked with
a quick glance.
F ig. 1 91 Engi ne compartment: cover on the coola nt
expansio n tank

230 Check ing and filling
We recommend using on ly coo lant addi-
tive
Gl2++, Gl3 or in an emergency Gl2 +. Do
not use a different additive . In an emergency
use plain water unt il you can get the correct
additive and can restore the correct ratio. This
should be done as soon as possible .
If you have lost a cons iderable amount of
coolant, then you should add co ld antifree ze
and cold water only when the engine is co ld.
A lways use
new engine coolant when refilling.
Do not fill coolant above the "MAX" mark. Ex­
cess coolan t will be forced out through the
p ressure relie f valve in the cap when the en ­
gine becomes hot.
A WARNING
- The coo ling system is under press ure and
can get very hot. Reduce the risk of
sca lding from hot coolant by following
these steps.
- Turn off the eng ine and a llow it to cool
down.
- Protect your face, han ds and arms from
escap ing fl uid and steam by cover ing
the cap with a large, thick rag.
- Tur n the cap slowly and very c arefully
in a counter-clockwise d irect ion while
applying light, downward press ure on
the top of the cap .
- To avo id being burned, do not sp ill an ­
tifreeze or coolant on the exhaust sys ­
tem or hot engine parts. Under certain
conditions, the ethylene glyco l in en­
g ine coolant can catch fire.
- Antifreeze is poisonous. Always store an­
t ifreeze in its or iginal container and well
out of the reach of children.
- If you drain the coolant, it must be
caught and safely stored in a proper con­
tainer clear ly marked "poison".
- Do not add coolant if the expansion tank
is empty. A ir could enter the cooling sys­
tem and damage the eng ine. If this is the case, do not cont
inue driving . Seek
professiona l assistance .
- Coo lant poll utes the environmen t and
co uld cause an engine fire . Excess cool­
ant will be forced out thro ugh the pres­
sure relief valve in the cap when the en­
gine becomes hot.
- If, in an eme rgency, only wate r can be
added, the correct ratio between water
and antifreeze
c::> page 228 must be re­
stored as soon as possible .
@ For the sake of the environment
Drained coolant should not be reused . A l­
ways d ispose of used coolant while observ­
i ng all environmental regulations .
Radiator fan
The radiator fan switches on automatically by
itself.
An a uxiliary electric radiator fan switches on
and off depending on coolant temperature
and other vehicle operat ing condit ions .
After yo u switch the engine off, the auxi liary
fan can continue r unning for up to 10 minutes
- even w ith the ignition off . It can even switc h
on again later by itself
c::> .& , if
- the temperature of the engine coo la nt rises
due to the heat build- up from the engine in
the engine compartment, or
- the engine compa rtment heats up because
the vehicle is parked in intense sunlight.
A WARNING
- To reduce the risk of personal injury nev­
er touch the radiator fan.
- The a uxiliary electric fan is temperat ure
controlled and can sw itch on suddenly
even when the engine is not ru nning .
- The a uxiliary radiator fan sw itches on a u­
tomatically when the engine coo lant
reaches a certai n temperature and will
continue to run until the coolant temper­
ature drops.

A
A/C (automatic climate control) .... .. .. 70
A/C (climate control) . . . . . . . . . . . . . . . . . 68
Accessories .. ............. .... .. .. . 294
Active lane assist . . . . . . . . . . . . . . . . . . . . 93
Activating and deactiva ting . .. .. .. .. .. 94
C leaning the camera area ... ... .. .. . 2 10
Descript ion ...... ..... ... ... ... .... 93
Instrument cluster indicator light . . . . . 94
Messages . . . . . . . . . . . . . . . . . . . . . . . . . 94
Notes on instrument cluster display .. .. 94
Sett ing the steering wheel vibrat ion .. .. 95
Adaptive a ir s uspension/sport . ... .. .. . 100
Adapt ive cruise control . . . . . . . . . . . . . . . . 84
C lea ning the sensor ....... .. .. .. .. . 210
Messages .. ............. .... .. .. .. 91
Request for driver intervention . . . . . . . . 89
Stop-and-go traffic . . . . . . . . . . . . . . . . . 88
Adapt ive Lig ht (defective) ... .. .. .. .. .. 22
AdBlue .. .. .. ................. .. ... 218
F il ling . .. .. ................. .. ... 220
Messages in the instrument cluster dis -
play . .. .. .. .. ........ ... .. ... ... . 219
Adding Eng ine coolant ........... .... .. .. . 229
Eng ine oil .. .. ........... .. .. .. ... 226
W indshield washer fluid ....... ... .. 235
Addit ives
E ng ine oi l .. ............. .... .. ... 226
Adj usti ng
A ir dist ribution (au toma tic climate con-
trol) ... .. .. .. .... .. .... ... .. .. .... 71
air distribution (cl imate control) ... .. .. 68
Front seats . . . . . . . . . . . . . . . . . . . . . . . . 52
Instrument illum inat ion ... .. .. .. .. .. 46
Steer ing colum n elec trically .. .. .. .. .. 73
Steer ing colum n manually . .. .. .. .. .. 73
Temperature (automat ic climate co ntrol) 71
Temperature (climate control) .. ... ... 68
Airbag system . . . . . . . . . . . . . . . . . 145, 166
Advanced Airbag System ... .. .. .. .. . 149
Advanced Airbag System components . 153
Care ...... ... ................ .... 161
M N Chi ld ren ... ... .. .. ...... .. .. .. .. . 173 0
~ Chi ld restra ints ........... .. .. .. ... 173
~ Components (front airbags) .. .. .. .. . 153 1.1"1 ,...., 1.1"1 ,....,
Inde x 297
Danger of fitting a ch ild seat on the front
passenger seat ..... . ... ...... ... .. 147
•
Disposa l .. .. .. .. .. . .. ... .... ... .. 161 •
Front a irbags . . . . . . . . . . . . . . . . 149, 151
How do the front airbags work? .... .. 155
How many a irbags does my vehicle
have? .. .. .. .. .. .. . .. .... .... .... 153
How the Advanced Airbag System com-
ponents work togethe r ......... .... 155
Impo rtant sa fe ty instru ctions on the
knee airbag sys tem ... .. .... ... .. .. 164
Important t hings to know . . . . . . . . . . . 145
Knee airbags ... .... . ... ...... ... .. 162
Monitoring .. .. .. ................. 157
PASSENGER AIR BAG OFF light ..... .. 158
Repairs ... .. .. .. .... ............. 161
Safety instructions .. .............. . 160
S ide a irbags ... .. .. . .. .... .... .. .. 164
S ide curtain airbags . ... ..... ... .... 167
Warning/ind icator lights ........ .. .. . 19
Warning/Indicato r lights ....... .. .. 157
When must t he system be inspected? 157
A ircraft
Transpo rting your vehicle 287
A lcantara
Cleaning .. .. .. .. ................. 212
A ll-wheel drive .. .... . ... ...... ... .. 197
Winter tires ..... .. . .. .. ..... ... .. 264
Alternato r . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Amb ience lighting . ................. . 46
Anti -freeze
refer to Engine coolant . ..... ... .. .. 228
Anti- lock b raking system ............ . 193
Warning/ind icator lights ........ .. .. . 19
Anti-slip regu lation .. ........... .... 193
Warning/ind icator lights .. .. ... ... .. . 19
Anti-theft systems Electronic immobi lizer ....... ... .. .. . 32
Asht ray .... .. .. .. .. . ............... 58
Audi braking guard
refer to brak ing guard ............. .. 84
Audi drive select
refer to drive select ... ............. 100
A udi Se rv ice Repair Manuals and Liter a-
tu re .. ... .. .. .... .. . .. ... .... ... .. 292

M N
0 <.J 'SI: ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
Starting with jumper cables . ... .. .. . 283
Stopping ... ..... ..... ... ... ... .... 75
E ng ine compartment ....... .. .. .. .. . 224
C losing the hood ......... .. .. .. .. . 223
Opening the hood ........ .. .. .. .. . 222
Safety instructions ..... ... .. .. .. .. . 222
Working in the engine compartment .. 222
E ng ine coolant ............ .... .. .. . 228
Adding coolant ........... .. .. .. ... 229
Chec king the eng ine coolan t leve l .. .. . 228
Expansion ta nk . ....... ... .. .. .. ... 228
M alfunct ion symbo l .... ... .. .. .. .. .. 1 6
Radiator fan . ..... .... ... .. .. .. ... 230
Temperature ga uge ....... .. .. .. .. .. 11
E ng ine oi l ... ............. .... .. ... 224
Adding .... .... .. .... ... .. .. .. ... 226
Addit ives ... ... .. ..... ... .. .. .. ... 226
Changing .. .... .. .... ... .. .. .. ... 227
Checking the eng ine o il level .. .. .. .. . 226
Indications and cond it ions requ iring ex-
tra check ing .. ... .. ... ... .. .. .. ... 226
Indicator light . . . . . . . . . . . . . . . . . . . . . 18
O il consumption ............. .... .. 225
Pressu re malfunct ion ...... .. .. .. .. .. 17
Recommended oil check in tervals .. .. . 226
Sensor defe ctive . . . . . . . . . . . . . . . . . . . . 22
Specification and viscos ity . ... .. .. .. . 224
E ng ine sound .............. ... ... .. 100
Eng ine speed limitat ion ..... .. .. .. .. .. 21
E ng ine start-stop mode
refer to Star t-Stop-System ... .. .. .. .. 81
E ng ine start system (indicator lights) .. .. 18
Environment Break- in period ........... .... .. ... 200
Catalytic converter ........ .. .. .. .. . 201
D iese l particu late filter .... .. .. .. .. . 202
Disposing of your vehicle battery ..... 235
Driving at high speeds ........ .... .. 203
Dr iving to m inimi ze pollu tion and no ise 202
Fu el ... .. .. .... ............. .. .. . 216
Fu el economy ... .. .... ... .. .. .... . 202
L eaks under your vehicle ... .. .. .. .. . 222
L etting the ve hicle stand and warm up . 203
Proper disposal of drained brake fluid . 231
Prope r disposal of drained engine coo l-
ant . .. ... . .... ............. .. .. . 229
Proper disposal of dra ined engine
oil . . . . . . . . . . . . . . . . . . . . . . . . . 226, 227
Index 301
Recycling used engine oil ..... ... .. .. 226
Unl eaded fuel .. .. .. . ... ...... ... .. 214
What shou ld I do with an o ld battery? . 235
E vent Data Recorde r (ED R) ........ .. .. 192
Exhaust tail pipes Cleaning .. .. .. .. .. ... ....... ..... 210
Expansion tank .. .. .. . ... ...... ... .. 228
E xte rior lighting . .. ................. . 43
Exterior m irrors
Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . SO
Dimm ing .. .. .. .. .. . .. .... .... .. .. . 51
Heating ......... .. ..... ........... SO
Exterior temperature display ...... .. .. . 24
F
Fastening
Booster seats .. .. .. ........... .... 180
Convertib le child safety seats .... .. .. 178
Infant seats . . . . . . . . . . . . . . . . . . . . . . 177
Floor mats . ... .... .. . .. .. ..... ... .. 131
Foot peda ls .... ... .. ..... .......... 131
For the sake of the environment
Ga soline fumes and the env ironme nt .. 216
Reduc ing engine noise by early upshift-
ing .......... ... .. ................ 11
Refueling . .. .. .... .......... ..... 216
Savi ng f uel by early ups hifting ... .. .. . 11
Fo ur- zone automatic climate control . .. . 70
Front airbags Description . ... .... . ... ...... ... .. 149
How they work ...... .. .. ..... ... .. 155
Fron tal coll is io ns and the laws of p hysics 13 7
Front seats . . . . . . . . . . . . . . . . . . . . . . . . . 52
Adjusting ... .. .. .. . .. .... .... .. .. 128
Child restraints i n the front seat ...... 147
Fuel Additives .. .. .. .. .. . .............. 214
B lended gasoline ..... ............. 214
Current consumption ... .... .... .. .. . 25
E conomy messages (effic iency p rogram) 26
Fuel fi ller flap emergency re lease . .... 218
F uel fi ller nec k ... ............. .... 216
Fuel gauge . . . . . . . . . . . . . . . . . . . . . . . . 12
Gasoline .. .. .. .. ... ............ .. 214
Gasoline additives . .. .. .. ..... ... .. 215
Low fue l level symbol . . . . . . . . . . . . . . . 22
Octane rat ing .. .. .... ......... .. .. 214
•
•

302 Index
Recommendation ................. . 214
Refuelling .. ... .......... .. .. .... . 216
Reserve .. .. ... .......... .. .. .... .. 12
Tank capacity . . . . . . . . . . . . . . . . . 12, 290
Fus es
Assignment ... ........ .. .. .. .... . 279
Replacing ... .. .......... .. .. .... . 279
G
Garage door opener (Homel ink) .. .... . . 41
Garme nt hooks . . . . . . . . . . . . . . . . . . . . . . 60
Gas discharge lamps ................. 282
Gauges Engin e coolant temperature .. .. .. .... 11
Fu el gauge .. .. .......... .. .. .... .. 12
Speedometer .. .......... .. .. .... .. 27
Tachometer ... .......... .. .. .... .. 12
Trip odometer ............... .... .. 27
General illus trat ion ........ .. .. .. .. . ..
8
Generator (warn ing/indicator lights) .. .. 17
Glossary of tir e and loading termino logy 239
Glove compartment (cooled) . . . . . . . . . . . 60
Glow plug system Indicator light . . . . . . . . . . . . . . . . . . . . . 21
Gross Vehicle Weight Rating (GVWR) ... 289
H
Head-up Display . . . . . . . . . . . . . . . . . . . . . 28
He adlights
C leani ng ... ... .. .. ...... .. .. .. .. . 210
Cleaning system ... ..... .. .... .. ... . 48
D efe ctiv e . . . . . . . . . . . . . . . . . . . . . . . . . 22
H ead light range control . . . . . . . . . 22, 43
Washer reservoir .................. 235
Hea d restraints . . . . . . . . . . . . . . . . . 55, 130
Ad justing .. ........ ..... .. ....... 130
Front seats . . . . . . . . . . . . . . . . . . . . . . . . 55
Rear seats . . . . . . . . . . . . . . . . . . . . . . . . . 56
Removing .. .. . .......... .. .. .... .. 56
Heate d
exterior mirrors . . . . . . . . . . . . . . . . . . . . SO
rear window (automatic climate control) 71
r ea r window (climate control) . .. .. .. . . 69
seats (au tomatic climate control) . . . . . . 71
seats (climate control) ..... .. .. .... .. 69 Steering
wheel . . . . . . . . . . . . . . . . . . . . . 72
windshield washer spray nozzles ... .. . 48
Heating .... .... .................... 67
Heavy clothing and safety be lts ........ 139
High beam . ..... .. .. ........... .. .. . 45
High voltage warning label .... ... .. .. 289
Hill descent control ... .......... .. .. 110
Homelink (garage door opener) ... .. .. . 41
Hood (release lever) .... .... ..... .. .. 222
Horn ............................... 8
How are child restraint system anchors re-
lat ed to child safety ................. 185
How many air bags does my vehicle have? 153
How often should I check my tire pres-
s ur es? ... .. .... .. ... .. .......... .. 251
How safety belt prete nsion ers work .. .. 143
Hydrop la ni ng ... .. ............. .. .. 257
I
Immobilizer . ..... .. ........... .. .. . 27
Important things to do before driving .. 126
Improperly worn safety belts ...... .... 142
Indicator lights
Dynamic steering .... .......... .. .. 197
also refer to Warning/indicator lights .. 12
Infant seats .. .. .. ............. .. .. 177
Installing child safety seats Safety belts . .. .. .......... ... .. .. 182
Installing the upper tether strap on the
anchorage .. ....................... 188
Instruments Adjusting the lighting ............ .. . 46
Instr uments and controls
General illustration . .. ... ... ... ...... 8
Instrument cluster . . . . . . . . . . . . . . . . . . 11
Interior lighting
Ambience lighting ... .. ..... ... .. .. . 46
Front and rear ... ... .. ..... ... .. .. . 46
Intermittent (w indshie ld w ipers) . ... .. . 48
J
Jack ..... .. .... .. .. ... ........ .. .. 271
Jump-starting . .. .. ..... ..... ... .. .. 283
Jumper cables ...................... 284