engine AUDI A7 2015 Manual PDF
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Page 228 of 316

226  Check ing  and  filling 
- Always  disconnect  the  battery. 
- Never  smoke  or work  near  heaters  or  open  flames . Fluids  in the  engine  com
partment  could  start  a fire. 
- Keep  an  approved  fire  extinguisher  im
mediately  available. 
- To avoid  electrical  shock  and  persona l in 
jury  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  repa ir 
with  the  engine  running: 
- Fi rst,  fully  apply  the  parking  bra ke, 
move  se lec to r  lever  to  P (Pa rk) . 
- Always  use  extreme  caution  to  preven t 
clot hing,  jewe lry, or  long  h air from  ge t
ting  caught  in the  radiator  fan,  V -belts 
or  other  moving  parts,  or from  contact ing  hot  parts.  Tie  back  hair  before 
start ing,  and  do  not  wear  cloth ing  that 
will hang  or  droop  into  the  eng ine. 
- Min imize  exposure  to  emission  and 
chemica l hazards¢ ,&.. 
A WARNING 
California  Propos ition  65  Warning: 
- Engine  exhaust,  some  of  its  constituents, 
and  certa in veh icle  components  conta in 
or  emit  chemicals  known  to  the  State  of 
Califor nia to  cause  cancer  and  b irth  de
fec ts a nd  reproduct ive  ha rm.  In  addition, 
certain  fluids  conta ined  in vehicles  and 
certa in  prod ucts  of  co mponent  wear  co n
ta in o r emi t chemicals  known  to  the 
State  o f Ca lifornia  to  cause  can cer  and 
birth  defects  or  ot her  reproductive  harm.  -
Battery  posts,  terminals  and  re lated  ac
cessories  conta in  lead  and  lead  com
pounds,  chemicals  known  to  the  State  of 
California  to  cause  cance r and  reproduc
tive  harms.  Wash  hands  after  handling . 
(D Note 
When  adding  flu ids,  always  make  sure  that 
they  are  poured  into  the  proper  conta iner 
or  f iller  opening,  otherwise  serious  dam
age  to  vehicle  systems  w ill occur. 
® For the  sake of  the  environment 
To detect  leaks  in time,  inspect  the  vehicle 
floor  pan  from  underneath  regularly.  If 
you  see  spots  from  oil or  other  ve hicle  flu
i ds,  have  yo ur vehicle  inspected  by a n au
thori zed  Audi  dea le r. 
Closing the  engine  hood 
.,.  Pull the  hood  down  un til the  pressure  from 
t he  struts  is  reduced. 
.,.  Let the  hood 
drop  down and  latch  in  p lace . 
Do not  try to push  it shut; it  may  fail  to  en
gage ¢&_ . 
A WARNING 
-
A hood  that  is  not  completely  latched 
could  fly  up  and  b lock your  view  while  dr iv
ing. 
- When  you  close  the  engine  hood,  check  it 
to  make  sure  the  safety  catch  has  p roper
ly engaged.  The  hood  sho uld  be  flush 
with  the  surrou nding  vehicle  body  pa rts. 
- If you  notice  while  driv ing  t hat  the  hood 
is not  s ecured  prope rly, stop  at  onc e and 
close  it.  
Page 229 of 316

M N <( I.J "". rl I.O 
"' rl 
"' rl 
Checking and  fillin g 22 7 
Engine  compartment 
Engine  compartment  overview 
These are the  most  important  items  that you  can check. 
Fig.  193 Typical l ayout  for  conta iners  and  engine  o il filler  cap 
@ Jump  start  poin t(-) with  hex 
head screw  .. .. ..... ... .. .. .  237,  285 
@ Jump start  point(+)  under  a cov-
er  .. .. ... ..... ...... ......  237,285 
@ Brake fl uid  reservo ir ((0))  ....  . 
© Engine  oil filler  cap ("1:::r.)  ....  . 
® Coolant  expansion  tank (-L)  ..  . 
© Windshield/headlight  washer 
t . 
(;;:;) con  ainer  ,..,, .. .... .. .. . .. .  234 
229 
23 1 
238 
The engine  oil  fille r neck  (item @) may be  lo
cated  in a d ifferent  a rea depend ing o n the 
ver
sion  of  the  eng ine. 
WARNING 
Before you  check anything  in the  engine 
compartment,  always read and heed all 
WARNINGS 
c::> &. in Working in the  engine 
compartment  on page  225. 
Engine  oil 
Engine  oil  specifications 
The  engine oil used must  conform  to exact 
specifications. 
T he service  interva l d isp lay in the  instrument 
cluster  of  yo ur vehicle  will  inform  you when  it 
is  time  for  an oil  change. We  recommend  that 
you  have your  oil  changed by an authorized 
Audi  Serv ice Advisor . 
If  you  have to  top  off  the  oi l between  oi l 
changes,  use the  Audi  o il quality  standard 
spec ified  in the  table. 
Audi oil  quality  standard 
Gasoline 
VW  502  00  or 
engine vw 504  00 
Diesel vw 507  00 
eng ine  
Page 230 of 316

228  Check ing  and  filling 
Using the  proper  engine  o il is important  for 
the  functionality  and service life  of  the  en
g ine. Your engine was factory-filled  with  a 
h igh-quality  oil  which  can usua lly be used 
throughout  the  entire  year. 
0 Note 
Your  L imited  New Vehicle Warranty  does 
not  cover damage  or  ma lfunctions  due to 
fai lure to  follow  recommended  mainte
nance and use requ irements  as set forth  in 
the  Audi  Owner's  Manual  and Warranty 
& 
Ma intenance  booklet. 
- Use only  a high  quality  eng ine oil  that  ex
pressly complies  w ith  the  Audi  o il quality 
standard  spec ified  for  your  veh icle's  en
gine.  Using  any other  oil  can cause seri
ous eng ine damage. 
- Do not  mix  any lubricants  o r othe r addi
tives  into  the  eng ine o il. Doing so can 
ca use engine  damage. 
If  you  need to  add oi l and there  is no ne 
availab le tha t mee ts the  Audi  oil  qua lity 
s tandard  your  engine  requires, yo u may 
add a tota l of  no more  than  0 .5 quart/liter 
of  a high-quality  "synthetic"oil  that  meets 
the  following  specifications. 
- Vehicles with  gaso line engine:  ACEA A3 
or  API SM with  a viscosity  grade of 
SAE 0W-30,  SAE SW-30  or  SAE SW-40. 
- Vehicles with  diesel  engine:  ACEA C3 or 
API CF with  a v iscosity grade  of 
SAE 0W-30  or  SAE SW-30. 
- For more  information  abo ut  eng ine oil 
that  has been approved for  your  vehicle,  please contact  either  your  a uthorized 
Audi  dealer  or Audi  Customer  Relations 
at  1 (800)  822-2834  or visit  our web  site 
at  www.audiusa .com  or 
www.aud icanada.ca. 
Engine oil  consumption 
The engine  in your  vehicle  depends  on on ade
quate  amount  of  oil  to  lubricate  and  cool  all 
of  its  moving  ports . 
In  order  to  provide  effective  lubricat ion and 
cooling  of  interna l eng ine components,  all  in
ternal  combust ion e ngines consume a certain 
amount  of  oil.  Oil consumpt ion va ries from 
engi ne to  engine  and may change sig nifican tly 
over the  life  of  the  engine.  Typically, engines 
with  a spec ified  break -in  period  (see 
c> page  203)  consume  more  oil  during  the 
break-in  period  than  they  cons ume after  oi l 
consumption  has stabilized. 
U nder  normal  cond itions,  the  rate  o f oi l con 
s u mption  depends on the  q uality  and viscos ity 
of  the  oil,  the  RPM (revolutions  per  minute)  at 
which  the  engine  is operated,  the  ambient 
temperature  and  road conditions.  Further  fac
tors  are the  amount  of  oil  dilut ion from  water 
condensation  or  fue l residue  a nd the  oxida
t ion level  of  the  oil.  As any eng ine  is subject  to 
wea r as m ileage builds  up, t he oil  co nsump 
t ion may  increase over time  until  replacemen t 
of  worn  components  may be come  necessary. 
With  a ll these  variab les coming  into  play, no 
standard  rate  of  oil  consumpt io n  can be  es
tabl ished o r spe cified . There i s no alte rnative 
to  regu lar and frequent  che ck ing of  the  o il  lev 
el , see 
Note. 
If  the yellow  engine  oil  leve l wa rning  symbo l 
i n t he i nstr ument  cluster 
Ill lights  up, you 
sho uld check the  oil  leve l as soon as possib le 
i=> page  229 . Top off  the  oil  at  your  earliest 
convenience 
i=> page  229. 
A WARNING 
--
Before you check anything  in the  engine 
compartment,  always read and  heed a ll 
WARNINGS 
c> & in  Working  in  the  engine 
comportment  on page  225. 
(D Note 
Driving  with  an insufficient  o il level  is like-
l y to  cause severe damage to  the  engine.  .,.  
Page 231 of 316

M N <( I.J "". rl I.O 
"' rl 
"' rl 
@ Tips 
-The oil  pressure  warning display.  i s 
not  an  indicator  of  the  oil  level.  Do not 
rely  on  it.  Instead , check the  oil  level  in 
your  engine  at  regular  intervals,  pref
erably  each time  you  refuel , and  always 
before  going  on  a  long  trip . 
-If you  have the  impression  your  engine 
consumes  excessive  amounts  of  oil, we  r ecommend  that  you consult  your Audi 
dealer  to have the  cause of your  concern 
properly  diagnosed.  Keep in mind  that 
the  accurate  measurement  of  oil con
sumption  requires great  care  and  may 
take  some  time.  Your Audi dealer  has  in 
structions  about  how to  measure  oil con
sumption  accurately. 
Checking  the  engin e oil  lev el 
Fig . 194 D isp lay : o il  lev el indicato r 
"' Park  your  vehicle  on  a  level  surface . 
"' Sh ut the  engine  off when  it  is warm. 
..  Switch  only the  ignition  back on. 
..  Wait  approximately  two  min utes . 
..  Select: 
ICARI funct ion  button> ( Car)*  sys
tems 
contro l button  > Se rvicing & checks > 
Oil level. 
.. Check  the oil level  in the  display¢ fig.  194 . 
Add engine  oil  if the  bar  of  the  oil level  indi
cator  is near  "min"  ¢ 
page  229 . 
Depending  on the  way  the vehicle  is driven 
and  the  operating  conditions,  oil consumpt ion 
can  be  up to  1/2  quart per  600  m iles  (0 .5 liter 
per  1,000  km) . Consumption  may  be  higher 
within  the  first  3,000  miles  (5,000  km). 
Checking  and  filling  229 
@ Tips 
The oil level  indicator  in the  MMI Display  is 
on ly an  information  display.  If the  oil  level 
i s  low, a minimum  oil warn ing appears  in 
the  instrument  cluster.  Add oil 
c» page  229. If the  hood  has  been  opened, 
the  current  oil level  is shown  in the  instru
ment  cluster  the  next  time  the  ignition  is 
switched  on. 
Adding  engine  oil '1:::1: 
Fig . 195 En gin e compart ment:  cove r on  the  eng ine oil 
filler  neck 
Before  you check  anything  in the  eng ine  com
partment , 
always  read  and  heed all WARN· 
INGS 
¢ A in  Working  in  the engine  compart
ment  on page  225  . 
.. Shu t the  engine off . 
"'U nscrew  the cap 
¢ fig.  195,  ¢page 227 , fig. 193 . 
..  Carefully top  off with  0 .5 quarts  (0 .5 liters) 
of the  appropr iate  oil 
¢ page 227. 
..  Check  the  oil level again  after  two minutes 
¢ page  229,  Checking the  engine  oil  level  . 
"'Top  off the  o il aga in,  if necessary  . 
..  Screw  the cap  back on the  fi lling  hole . 
_&. WARNING 
-While  topping  off, the  oil must  not come 
in  contact  with  hot  engine  parts  -fire 
hazard! 
- The oil  filler  cap  must  be prop erly  se
cured  to prevent  oil from  being sprayed 
on  the  hot engine  and exhaust  system 
when  the  engine  is  running -fire  hazard!  .,.  
Page 232 of 316

230  Check ing  and  filling 
- If your skin has come  in contact  with the 
engine  oil, you must  subsequently 
cleanse  it thoroughly. 
- Check the  oil leve l using the  MMI. If the 
message 
Ple ase  red uce  oil  le vel appears, 
contact  your author ized Audi dealer  or 
other  qualified  workshop  to  have excess 
oil extracted  if necessary . 
-Audi does  not  recommend  t he  use  o f oil 
add it ive s. They ma y damage  the  e ngine 
and  adve rsely  aff ect  your  New  Vehicl e 
Warranty. 
@ For the  sake of the  environment 
- Under no circumstances  can the  oil come 
in contact  with the  sewage  network  or 
the  soil. 
- Observe and  follow  lega l regu lations 
when  disposing  of empty  oil containers. 
Changing the  engine  oil 
We recommend  tha t have your  oil  changed  by 
an authorized  Audi  dealer  or  a qualified  serv 
ice station . 
Before you check anything  in the  engine  com
partment, 
alway s  read  and  heed  all WARN
INGS 
~ .& in Working  in  the  engine  compart
ment  on page  225 . 
The engine  oil must  be changed  according  to 
the  intervals  specified  in your Warranty 
& 
Maintenance  booklet . This  is very  important 
because  the  lubricating  properties  of oil di
minish gradua lly dur ing no rmal veh icle use . 
Under some  circumstances  the  engine  o il 
should  be changed  more frequently . Change 
oil more  often  if you drive most ly short  dis
tances , ope rate  the  vehicle  in dusty  areas  or 
under  predominantly  stop-and-go  traffic  con
d itions,  or  have your veh icle where  tempera
tures  remain  below freezing  fo r ex tended  pe 
riods . 
Detergent  addit ives in the  o il w ill ma ke fresh 
oil  look dark  after  the  eng ine has  been  run- ning for  a sho
rt time.  This is normal  and  is not 
a reason  to  change  the  oil more  often  than 
recommended. 
Because of the  problem  of  proper  disposal, 
along  with the  specia l tools  and  necessary  ex
pertise  req uired, we strongly  recommend  that 
you have your oil changed  by an a uthorized 
Aud i deale r or a qualified  service station. 
If  yo u choo se to  chan ge your  oil yours elf , 
please  note  the  fo llowing important  informa 
t ion: 
A WARNING 
= 
To reduce  the  risk of personal  injury if you 
must  change  the  eng ine oil in your vehicle 
yourself: 
- Wear eye protect ion. 
- To reduce the  risk of burns  from  hot  en-
g ine oil, let  the  engine  cool down to  the 
touch. 
- When  removing the  oil dra in p lug with 
your fingers,  stay  as far  away as  possible. 
Always keep your forearm  parallel  to  the 
ground  to  help  prevent  hot  oil from  runn ing down you r arm. 
- Dra in the  oil into  a container  designed 
for this  purpose,  one  large  enough  to  hold at  least  the  tota l amount  of o il in 
your  engine . 
- Engine oil is poisonous . Keep  it wel l out 
of the  reach of children. 
- Continuous  contact  with  used  eng ine o il 
is harmful  to  your sk in . Always protect 
your skin by washing  oil off tho roughly 
wit h soap  and wate r. 
(D Note 
Neve r mix oil additives  with you r engine 
oi l. These additives  can damage  your en
gine and  adversely affect  your Audi  Limit
e d  New Veh icle War ranty. 
@ For the  sake of the  environment 
- Before changi ng your oil, first  make su re 
you  know where you can prope rly dispose 
o f  the  used  oil.  ..,.  
Page 233 of 316

M N 
"' rl 
-Always dispose  of used  engine  oil  proper
ly.  Do not  dump  it  on  garden  soil,  wood
ed  areas,  into  open  streams  or  down 
sewage  drains. 
- 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
quires  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 specially  conditioned  water  and  the 
manufacturer 's  glycol-based  coolant  addi-
tive  G13  antifreeze  with  anticorrosion  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  cooling  system  from 
corrosion  and  scaling. 
It also  raises  the  boil
ing  point  of  the coolant. 
Do not  reduce  the  concentration  of the  cool
ant  in  the summer  by adding  plain  water. 
The 
proportion  of  coolant  additive  must  be at 
least  50%  but  not  more than  60% 
to  main
tain  antifreeze  protection  and  cooling  efficien 
cy . 
If the  coolant  frost  protection  is too  low, 
the  coolant  could  freeze  and  damage  the  vehi
cle  heating  and  engine  cooling  system. 
For year -round  driving,  antifreeze  is  added  at 
the  factory  for  temperatures  down  to: 
- -31°F(-35°C)USA 
- -40  °F ( - 40  °C) Canada. 
If  you  must  add  coolant,  use a  mixture  of wa
ter  and  coolant  additive.  Mixing the  coolant 
additive  with  distill ed  water  is  recommended . 
Checking  and  filling  231 
A WARNING 
Before  you  check  anything  in the  engine 
compartment,  always  read  and  heed all 
WARNINGS ~&. 
in  Working  in the  engine 
compartment  on page  225. 
(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 especially  impor
tant  if you  live  in a  region  where  the  win
ter  is extremely  cold.  If  necessary, in
crease  the  proportion  of  coolant  additive 
to  60%. 
- When  adding  coolant  additive to your 
cooling  system,  remember: 
- We  recommend  using  only  coolant  ad
ditive  G12++  or  G13  (check  the  label) 
for  your  vehicle.  This  coolant  additive  is 
available  at  authorized  Audi  dealers. 
Other  types  of  antifreeze  can signifi
cantly  reduce  corrosion protection.  The 
resulting  corrosion  can  cause  a loss of 
coolant  and  serious  engine  damage. 
- Do  not  add  any  type of  radiator  leak  seal
ant  to  your  vehicle's  engine  coolant. 
Adding  radiator  repair  fluid  may  adverse
ly affect  the  function  and  performance  of 
your  cooling  system  and  could  result  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. 
Fig. 196 Engine  compa rtment:  cove r on t he coola nt 
expansion  tank  
Page 234 of 316

232  Check ing  and  filling 
Before you check anything  in the  engine com
partment, 
a lways  r ea d  and heed  all WARN
INGS ¢ A in Working  in the  engine compart
ment  on page  225. 
•  Park your vehicle on a  level surface. 
•  Switch 
off the  ignition . 
•  Read the  eng ine coolant  leve l from  the  cool
ant  expansion  tank 
c> fig.  196, c> page  22 7, 
fig.  193. With a cold eng ine,  the  coolant 
level should  be between  the  "min" and 
"max"  markings. When the  engine  is warm, 
the  leve l may be slightly above the  "max" 
ma rk ing. 
The location  of the  coolant  expans ion tank 
can be seen  in the  engine  compartment  illus
tration ¢ 
page  22 7. 
To obtain  an  accurate reading,  the  engine 
must  be sw itched 
off. 
The  expans ion tank  in your  vehicle is equipped 
with  an electric  coolant  level  sensor. 
When the  coo lant  level  is too  low, the  warning 
light in the  Auto-Check System ¢ page l 6 will 
i l luminate  unti l yo u add  coolant  and  the  level 
has been  restored  to  normal. Even though 
there  is an  electric  coolant  level senso r,  we 
still  recommend  you check the  coolant  leve l 
from  time  to  time . 
Coolant  loss 
Coolant loss  may indicate  a lea k in the  cooling 
system.  In the event  of  coolant loss, the  cool
ing system  should  be  inspected  immediately 
by your author ized Audi dealer.  It  is not 
enough  merely to  add  coolant. 
In  a 
sealed system,  losses  can occur only if 
the  boiling point  of the  coolant  is  exceeded  as 
a  result  of overheat ing. 
A WARNING 
T he cooling system  is unde r pr essure  and 
c an get  ve ry hot.  Reduce t he  risk of s cald
ing from  hot  coolant  by followi ng these 
steps . 
- T urn 
off the  engine  and  allow  it  to cool 
dow n.  -
Protect  your face,  han ds and  arms  from 
escaping  flu id and  steam  by cover ing the 
cap with  a large,  thick rag. 
- Tu rn the  cap slowly and very care fully in 
a counte r-clockwise direct ion while  ap
plying lig ht,  downward  pressure  on the 
top  of the  cap. 
- To avo id being  burned,  do not  sp ill anti
freeze  or coolant  on the  exhaust  system 
or hot  engine  par ts.  Under  certa in cond i
tions,  th e ethylen e glyco l in engine  coo l
a nt  can catch  fire. 
(D Note 
Do not  add  a ny type  o f radiator  leak sea l
ant  to  your veh icle's  engine  coolant.  Add
i ng  radiator  r epa ir fluid  may adv erse ly af
fe ct the  funct io n  and  perfo rma nce of you r 
co oling  syste m and  could  result  in damage 
not  covered by your  New Veh icle  Limi ted 
War ran ty. 
Adding  coolant 
Be very careful  when  adding  engine  coolant. 
Befo re you check anyth ing  in the  eng ine com
partment, 
alway s read  and  heed  all  WARN· 
INGS ¢ A in  Working  in the  engine  compart
ment  on page  225. 
•  Requirement:  The re must  be a r esidua l 
amount  of coolant  in the  e xpansion  ta nk 
¢(D. 
•Tur no ff the engine. 
•  Le t the  engine cool down. 
•  Place  a thick rag ove r th e  coo lant  expansion 
tank 
¢ page  231,  fig.  196 and carefully 
twist  the cap co unte r-clockwise c> &_ . 
• Add coo lant  m ixed  in  the  correct  rat io 
¢ page  231,  Coolant up to  the  MAX mark
ing. 
•  Make s ure that  the  fl uid leve l remains  sta-
b le. Add more  coo la nt  if necessary. 
•  Twis t the  cap o n again 
tightly. 
Replacement  engine  coo la nt  must  confo rm to 
exact spec ificat ions 
¢ page  2  31,  Coolant.  .,.  
Page 235 of 316

M N <( (.J 
'SI: ,...., \!) ..,., 
,...., ..,., ,...., 
We recommend  using only coolant  addi-
tive 
Gl2++,  Gl3 or  in an emergency Gl2+. Do 
not use  a different  additive.  In an emergency 
use plain water  until 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 considerable  amount  of 
coolant,  then  you should  add  cold antifree ze 
and  cold water  only when  the  engine  is cold. 
Always use 
new engine  coolant  when  refilling. 
Do  not fill coolant  above the "MAX"  mark. Ex
cess coolant  will be forced  out  through  the  pressure  relief valve in the  cap when  the en
gine  becomes  hot. 
A 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 itto 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 an 
tifreeze  or coolant  on the  exhaust  sys
tem  or hot  engine  parts.  Under certain 
conditions,  the  ethylene  glycol in en
gine coolant  can catch  fire. 
- Antifreeze  is poisonous.  Always store  an
tifreeze  in its original 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  clearly marked  "poison". 
(D Note 
- Do not  add  coolant  if the  expansion  tank 
is  empty.  Air could  enter  the  cooling sys
tem  and  damage  the  engine.  If this  is 
Checking  and  filling  233 
the  case,  do not  continue  driving. Seek 
professional  assistance . 
- Coolant  pollutes  the  environment  and 
could cause  an engine  fire.  Excess cool
ant  will be forced  out  through  the  pres
sure  relief valve  in the  cap when  the  en
gine becomes  hot. 
- If, in an emergency,  only water  can be 
added,  the  correct  ratio  between  water 
and  antifreeze 
c> page  231 must  be re
stored  as  soon  as  possible. 
@ For the  sake of  the environment 
Drained coolant  should  not  be  reused. Al
ways dispose  of used  coolant  while observ ing  all environmental  regulations. 
Radiator fan 
The radiator  fan  switches  on automatically  by 
itself. 
An auxiliary electric  radiator  fan  switches  on 
and  off depending  on coolant  temperature 
and other  vehicle operating  conditions . 
After you switch  the  engine  off, the  auxiliary 
fan  can continue  running  for  up to 10 minutes 
- even with  the  ignition  off. 
It can even switch 
on again  later by itself 
c> .&, if 
- the  temperature  of the  engine  coolant  rises 
due to  the  heat  build-up from  the  engine  in 
the  engine  compartment,  or 
- the  engine  compartment  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 auxiliary electric  fan  is temperature  controlled  and  can switch on suddenly 
even when  the  engine  is not  running. 
- The auxiliary  radiator fan  switches  on au
tomatically  when  the  engine  coolant  reaches  a certain  temperature  and will 
continue  to  run until  the  coolant  temper
ature  drops. 
• 
•  
Page 236 of 316

234  Checking  and  filling 
Brake  fluid 
Checking brake fluid  level 
Fig . 197 Engine  compartment:  cove r on the  brake fluid 
reservo ir 
Before you  check  anything  in the  engine  com
partment, 
always  read and heed  all  WARN
INGS ¢&. in Working in the  engine  compart
ment  on page  225. 
,..  Read  the  brake  fluid  level  from  the  brake 
fluid  reservoir¢ 
fig . 197, ¢ page 22 7, 
fig.  193. 
The  brake  flu id level  must  be be
tween  the "MIN"  and "MAX"  markings. 
The  location  of  the  brake  flu id  reservoir  can  be 
seen  in  the engine  compartment  illust rat ion 
¢ page 227. 
The fluid  level  may  drop 
slightly after  some 
time  due  to the  automatic  adjustment  of  the 
brake  pads. This  is not  cause  for  alarm. 
If  the  brake  fluid  level  falls 
considerably be
low  the  "MIN"  mark,  the  brake  warning/indi
cator  light . (U.S. models)/ . (Canadian 
models)  will  come on¢ 
page  15. Do not  con
tinue  to operate  the  vehicle.  The  comp lete 
brake  system  shou ld be  thoroughly  checked 
by an  authorized  A udi dealer  or  other  quali
fied  facility  and  the  cause  corrected. 
If the 
brake  fluid  level  is too  low,  the  brake  warning/ 
indicator  light  will  illuminate.  Contact  an  au
thorized  Audi  dealer 
immediately . 
Changing  brake fluid 
Have the  brake  fluid  changed  by an experi
enced  technician . 
Brake fluid  absorbs  moisture  from  the  air.  If 
the  water  content  in the  brake  fluid  is too  high,  corrosion  in the  brake  system  may  result 
after  a period  of  time . The  boiling  point  of  the 
brake  flu id  will also  decrease  conside rably  and 
decrease  braking  pe rformance. 
Therefore,  the  brake  fluid  must  be  changed 
every two  years . Always use  new  brake  flu id 
which  conforms  to  Federal Motor Vehicle 
Standard  "FMVSS  116  DOT 4". 
The  brake  fluid  reservoir  can  be  difficult  to  reach,  therefore,  we  recommend  that  you 
have  the  brake  fluid  changed by your  author
ized 
Audi  dealer. Your dealer  has  the  correct 
tools,  the  right  brake  fluid  and the  know-how 
to  do  this  for  you. 
A WARNING 
- Brake fluid  is poisonous . It  must  be stor
ed  only  in the  closed  original  container 
out  of the  reach of  children! 
- Brake failure  can  resu lt  from  o ld  or  inap
propriate  brake  fluid.  Observe  these  pre
cautions: 
- Use  only  brake  fluid  that  meets  SA E 
specification 
J 1703  and conforms  to 
Federal  Motor  Vehicle  Standard 116. 
Always check  with  your  authorized Audi 
dealer  to  make  sure  you  are  using  the 
correct  brake  fluid.  The  correct  type  of 
brake  f luid  is also  indicated  on  the 
brake  fluid reservoir. 
- The  brake  fluid must  be  new.  Heavy use 
of the  brakes  can  cause  a  vapor  lock if 
the  brake  fluid  is  left in the  system  too 
long.  This can  seriously  affect  the  effi
c ie ncy of the  brakes  as  well  as  your 
safety.  This could resu lt  in an  accident. 
(D Note 
Brake fluid  will damage  the  paint  of your 
vehicle .  
Page 238 of 316

236  Check ing  and  filling 
& 
Batt ery  aci d c ont ain s s ulfuric  acid . 
A lw ay s  w ear  gloves a nd eye  protec-
ti on. 
@ 
No 
- spark s 
- flame s 
·  sm okin g. 
A 
When a  b atte ry is ch arged , it  p rodu -
ce s hydr oge n ga s wh ich i s ex plosi ve 
. 
and  co uld  cause pe rso nal  injur y. 
® 
Alway s keep the  batt ery  well  out  of 
re ach of  children. 
A WARNING 
Whenever  working  on  the  battery  or  on 
the  electrical  system,  there  is the  r isk  of 
injury,  acc ident  and  even  fire.  Read  and 
heed  the  following  WARNINGS: 
- Always wear  eye  protection.  Do not  let 
battery  acid  or  any  lead  part icles  get  on 
your  sk in or  cloth ing . Sh ield  your  eyes . 
Explosive  gases  can  cause  blindness  or 
other  injury. 
- Battery  acid  contai ns  sulfur ic acid.  Sulfu
ric acid  can  cause  blindness  and  severe 
burns. 
- Always wear  gloves  and  eye  protection. 
Do not  tilt  the  battery  because  ac id 
could  leak  out  of the  vent ilation  open
ings. 
- If you  get  battery  acid  in your  eyes  or 
on  your  sk in,  immediately  rinse  with 
cold  water  for  severa l m inutes  and  get 
medical  attention . 
- If you  should  ingest  any  battery  acid, 
seek  medical  attention  immediately . 
- Do not  expose  the  battery  to  an  open 
flame,  electric  sparks  or  an  open  light. 
- Do not  smoke. 
- Do not  interchange  the  positive  and  neg-
ative  cab les. 
- When  working  on  the  battery,  be  sure 
not  to  short-circuit  the  terminals  with 
tools  or  other  metal  objects.  This would 
cause  the  battery  to heat  up  very  quickly, 
wh ich  could  lead  to  damage  or  explosion 
and  personal  injury.  -
When  a  battery  is charged,  it  produces 
hydrogen  gas  which  is explosive  and 
could  cause  personal  injury. 
- Always keep  the  battery  well  out  of  the 
reach  of  children. 
- Before  work  is  done  on  the  electrical  sys
tem,  disconnect  the  negat ive ground  ca
ble. 
- Before  performing  any work  on  the  e lec
trica l system,  switch  off  the  engine  and 
ignit ion  as  well  as  any  electrical  equip
ment.  The  negative  cable  on  the  battery 
must  be  disconnected . 
If you are just  go
ing  to  replace  a  light  bulb,  then  it  is 
enough  to  swi tc h  off  the  lights. 
- Before  disconnecting  the  battery,  switch 
off  the  anti-theft  alarm  system!  Other
wise  you  wi ll set  off  the  alarm. 
- When  disconnecting  the  battery,  f irst 
d isconnect  the  negat ive cab le  and  then 
the  posit ive c ab le. 
- Before  reconnecting  the  batte ry, ma ke 
sure  all  e lectr ica l consumers  are  sw itch
ed  off.  Re connect  the  pos it ive cable  first 
and  then  the  negative  cable.  Never  inter 
change  the  cables  - this  could  start  a fire! 
- Never  charge  a  frozen  or  a  thawed-out 
battery.  It  could  exp lode!  If  a  battery  has 
frozen,  then  it  must  be  replaced . A dis
charged  battery  can  freeze  over  at  32 
°F 
(0 oc). 
- Make sure  the  vent  hose  is always  attach
ed  to  the  opening  on  the  s ide  of the  bat
tery. 
- Never  use  batteries  which  are  damaged. 
There  is the  danger  of an  explosion!  Al
ways  rep lace  a  damaged  battery. 
A WARNING 
Ca lifornia  Proposition  65  Warning: 
- Battery  posts,  terminals  and  related  ac
cessories  conta in  lead  and  lead  com
pounds,  chemicals  known  to  the  State  of 
California  to  cause  cancer  and  reproduc
tive  problems . Wash  hands  after  han-
dling. 
~