2015 AUDI S8 radiator

16 Instruments and warning/indicator lights
If the engine coolant level is correct, then the
radiator fan may be the cause of the malfunc­
tion.
• Coolant temperature too high! Please let
engine run with vehicle s tationary
If the indicator light turns on and the mes­
sage appears, let the engine run at idle for a
few minutes to cool down.
A WARNING
- If your vehicle should break down for
mechanical or other reasons, park at a
safe distance from moving traffic, turn
off the engine and turn on the hazard
warning lights¢
page 47, Emergency
flasher .
-Never open the hood if you see or hear
steam or coolant escap ing from the en­
gine compartment -you risk being scald­
ed . Wait until you can no longer see or
hear steam or coo lant escaping.
- The engine compartment of any veh icle
is a dangerous area. Before you perform
any wor k in the engine compartment,
turn of the eng ine and allow it to cool.
Follow the warning sticke rs
¢page 228.
(D Note
Do not continue driving if the . symbol
illuminates. There is a malfunction in the
engine cooling system -you could damage
your eng ine.
0 Battery
This warning/indicator light detects a mal­
function in the generator or in the vehicle's
electrical system .
The. warni ng/indicator light illuminates
when you switch on the ignition and must go
out after the engine has started .
• Alternator fault: Battery is not being
charged
If the indicator light turns on and the mes ­
sage appears, there is a malfunction in the
generator or vehicle electr ica l system . Drive to
your authorized Audi dealer or quali­
fied workshop immediate ly. Because the vehi­
cle battery is discharg ing, turn off all unnec ­
essary electrical equipment such as the rad io .
Seek professional assistance if the battery
charge level is too low .
r•j Low battery charge: battery will be
charged while driving
If the indicator light turns on and the mes­
sage appears, there may be limited starting
ability.
If this message turns off after a litt le while,
the battery charged enough while driving.
If the message does not turn off, have your
authorized Aud i dealer or qualified workshop
correct the malfunction.
L'h Engine
• Engine stopped: No power steering and
brake support.
The re is a malfunction in the engine or in the
fuel supply system.
A large amount of steering and braking force
is required when driving a rolling vehicle with
the engine stopped. Tr y to stop a rolling vehi­
cle carefu lly on the side of the road. See your
authorized Audi dealer or qualified repair fa­
cility.
A WARNING
-If the engine stops while driving, a large
amount of braking force is required. This
in creases the r isk of an accident. As long
as the vehicle rolls with the ignit ion
switched on and there is enough battery
cha rge, the power steering will sti ll work.
If not, a large amount of steering force is
r equired.
-

84 On th e road
Emerg ency off
If necessary, the engine can be sw itched off
with the selector lever in the R, Dor S posi ­
tions . The engine stops if you press the
I START ENGINE STOP ! button at speeds below
6 mph (10 km/h).
A WARNING
- Never turn off the eng ine before the ve­
hicle has come to a complete stop . The
full function of the brake booster and the
power steering is not quaranteed. You
must use more force to turn or brake if
necessary. Because you cannot steer and
brake as you usual ly would, this could
lead to crashes and serious injur ies.
- For safety reasons, you should always
park your vehicle with the se lector lever
in P. Otherwise, the vehicle co uld inad­
vertent ly roll away .
- After the engine has been switched off, the radiator fan can continue to run for
up to 10 min utes - even with the ign it ion
switched off. It can a lso switch on aga in
after some time if the coolant tempera­
ture rises as the result of a heat buildup or if the engine is hot and the engine
compartment is addit ionally heated by
the sun's rays.
(D Note
Do not stop the engine immed iate ly afte r
ha rd or extended dr iving. Keep the engine
r u nning for approx imately two m inutes to
prevent excessive heat build-up.
Driver message in the instrument
cluster display
T urn off ignition before le aving car
This message appears and a war ning tone
sounds if you open the driver's door when the
ignitio n is switched on.
Pr ess brake p edal t o start engin e
This message appears if you press the
I STAR T ENGINE S TOP ! button to start the en- gine and do not depress the brake pedal.
The
engine can only be started if the brake pedal
is depressed.
Ill I s key in th e vehi cle?
If the indicato r light turns on and the mes­
sage appears, the remote control key was re­
moved from the vehicle whi le the engine was
runn ing .
If the igni tion key is not in the veh i­
cle you will not be able to switch on the igni­
tion or restart the engine after it has been switched off. You will a lso not be able to lock
the vehicle from the outs ide.
Shift to P, othe rwi se vehicle can roll away.
Door s do not lock if lever i s not in P.
T h is dr iver message appears for safety rea­
sons if the transmission has not been shifted
to the P position when you switch the ignition
off. Move the selector lever to the P position.
Otherwise the vehicle is not protected from
ro lling and cannot be locked.
II Key i s not recognized . Hold b ack of key
again st m arked are a. See ow ner' s m anual.
If the indicator l ight turns on and this mes­
sage appe ars, there is a ma lfunct ion
¢ page 85.
Tu rn off i gnition before leaving car. Ba ttery
i s di sc harging
Th is message appears if the driver's door is
opened wh ile the ignition is switched on. Al­
ways switch off the ign it ion if you a re leav ing
the vehi cle. See also
¢page 89 .
Shift to P and turn off ignition before l eav­
ing car, otherwi se vehicle c an roll away
This message appears if the driver's door is
opened wh ile the ignition is switched on and
the selecto r lever is not in the P position. Shift
the selector lever into the P pos ition and
switch off the ignit ion when you exit the vehi­
cl e. Otherw ise the vehicle cou ld rol l. See also
¢page 89.

.... N .... N
0 J:
"". .... I.O
"' ....
"' ....
cameras. Depending on the vehicle equip­
ment, you are assisted by vario us views such
as peripheral view, corner views at the front
and rear of the vehicle, and views directly in
front of or behind the vehicle.
General information
App lies to vehicles: with top view camera system
Fig. 138 Location of peripheral cameras
Depending on the vehicle equipment, the pe­
ripheral cameras are found in the radiator
grille, in the luggage compartment lid and on
both exterior mirrors
c> fig. 138. Make sure
that the lenses are not covered by deposits or
any other obstructions as it may impair the
system. For information on cleaning, refer to
9page214.
In the top view mode, black corners are
shown in the vehicle silhouette . Objects in
these areas are outside of the camera's field of view and are not detected.
The accuracy of the orientation lines and the
b lue surfaces is reduced if the adaptive air
suspension* is faulty, if the vehicle is lifted or
if the
dynamic mode is activated 9 page 108 .
_& WARNING
-Always read and follow the applicable
warnings
9 .&. in General information on
page 120.
- If the position or the installation angle
of a camera was changed, after a colli­
sion for example, do not continue to use
the system for safety reasons. Have it checked by your authorized Audi dealer­
ship .
-
Parking systems 125
- Keep in mind that the image in the dis­
play is distorted if the exterior mirror
housing has been manually adjusted.
- Use the
rear mode and the corner view
(rear)
mode only when the luggage com­
partment lid is fully closed. Otherwise
the image in the display will be distort­
ed.
- The vehicle surroundings are shown us­
ing the camera images. The vehicle im­
age is shown by the system. Objects and
obstacles above the camera are not dis­
played.
- Camera lenses enlarge and distort the
field of vision. The objects appear both
altered and inaccurate on the screen.
(D Note
-Always read and follow the applicable
warnings
~CD in General information on
page 120.
- The Infotainment display shows the di­
rection in which the rear of the vehicle is
traveling based on the steering wheel
angle. The front of the vehicle front
swings out more than the rear of the ve­
hicle. Maintain plenty of distance so that
your outside mirror or a corner of your
vehicle does not collide with any obsta­
cles.
@ Tips
If the 8/IT;1J/c:5 symbol appears in the
display and the respective display area is
grayed out, then the power exterior mir­ rors were folded in or the driver's door/
front passenger's door/luggage compart­
ment lid was opened .

228 Checking and filling
Checking and filling Engine hood
Releasing the engine hood
The engine hood is released from inside the
vehicle .
Fig. 197 Driver foo twell: release lever
Fig. 198 Rocker switch un der the hood
Make sure the wiper arms are not raised up
from the windshield. Otherwise the paint
could be damaged.
.,. Pull the lever under the instrument panel in
the direction of the arrow
¢ fig. 197.
.,. Raise the hood slightly¢,&. .
... Press the rocker switch under the hood up­
ward ~
fig. 198. This releases the catch.
• Open the hood.
&_ 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 compartment . Wait until no steam or
coolant can be seen or heard before care­
fully opening the hood .
'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 per­
sonal injury always observe the following
WARNINGS. The engine compartment of any
vehicle is a hazardous area
¢ ,&. .
A WARNING
To help avoid injury, before you check any­
thing under the hood:
- Turn off the engine.
- Switch off the ignition .
- Apply the parking brake.
- 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
compartment. Wait until no steam or
coolant can be seen or heard before care­
fully opening the hood.
- Keep children away from the engine com­
partment.
- Never spill fluids on hot engine compo­
nents . They can cause a fire .
- Never touch the radiator fan. The auxili­
ary electric fan is temperature controlled
and can switch on suddenly .
- Never open the coolant reservoir cap
when the engine is still warm . The cool­
ant system is pressurized and hot cool­
ant 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.
- Do not
remove the engine cover under
any circumstances. This increases the
risk of burns.
- If work on the fuel system or the electri­
cal system is necessary:

,....,
N ,....,
N
0 J:
'SI: ,...., \!) 1.1'1 ,...., 1.1'1 ,....,
-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 personal 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 repair
with the engine running:
- First, fully apply the parking brake,
move selector lever to "P" (Park).
- Always use extreme caution to prevent
clothing, jewelry, or long hair from get­
ting caught in the radiator fan, V-belts
or other moving parts, or from contact­ ing hot parts. Tie back hair before
starting, and do not wear clothing that
will hang or droop into the engine.
- Minimize exposure to emission and
chemical ha zards c:::> & .
A WARNING
California Proposition 65 Warning:
- Engine exhaust, some of its constituents,
and certain vehicle components contain
or emit chemicals known to the State of
California to cause cancer and birth de­
fects and reproductive harm. In addition ,
certain fluids contained in vehicles and
certain products of component wear con­
tain or emit chemicals known to the
State of California to cause cancer and
birth defects or other reproductive harm .
Checking and filling 229
-Battery posts, terminals and related ac­
cessories contain lead and lead com­
pounds, chemicals known to the State of
California to cause cancer and reproduc­
tive harms. Wash hands after handling.
(D Note
When adding fluids, always make sure that
they are poured into the proper container
or filler opening, otherwise serious dam­
age to vehicle systems will 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 vehicle flu­ ids, have your vehicle inspected by an au­
thorized Audi dealer.
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 en­
gage
c:::> ,A .
A WARNING
-
A hood that is not completely latched
could fly up and block your view while driv ­
ing .
- When you close the engine hood, check it
to make sure the safety catch has proper­ ly engaged. The hood should be flush
with the surrounding vehicle body parts.
- If you notice while driving that the hood
is not secured properly , stop at once and
close it. •
•

236 Check ing and filling
@ For the sake of the environment
- Before changing your oil , first make sure
you know where you can properly dispose
of the used oil.
- 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 sea led and generally re­
qu ires little attention .
The cooling system has been filled at the fac ­
tory with a pe rmanent coolant which does not
need to be c hanged. The coolant consists of a
mixture of spec ia lly conditioned water and the
manufacturer 's glycol-based coo lant add i-
tive G l3 antifreeze with ant icorrosion addi ­
tives (50% for USA models ; 60% for Canadian
mod els). This mixture both assures the nec es­
sary frost protection and protects metal com­ ponents in the engine's cooling sys tem from
corrosion and scaling . It a lso raises the boil­
ing point of the coolant .
Do not red uce the concentration of the coo l­
ant in the summer by adding plain water.
The
proportion of coolant add it ive mu st be at
l e a st 50 % but not more than 60 %
to main­
tain antifreeze protection and cooling efficien­
cy . If the coolant frost prote ct ion is too low,
the coo lant cou ld freeze and damage the veh i­
cle hea ting and eng ine cooling system.
For yea r-round d riving, antifreeze is added at
the fac to ry for temperatures down to:
-- 31°F( -35°C)USA
- -40 °F ( -40 °C) Canada. If
you must add coolant, use a mixture o f wa ­
ter and coolant additive . Mixing the coo lant
additive with distilled water is recommended.
A WARNING
-
Before you c heck anything in the engine
compartment, always read and heed a ll
WAR NINGS
c::, & in Working in the engine
compartment on page 228.
(D Note
- Before winter sets in, have the coo lant
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 the win­
ter is ex treme ly cold. If ne cessa ry, i n­
crease the pr opo rtion of coo lant add itive
t o 60%.
- Whe n adding coolant additive to yo ur
c ooling sys tem, remembe r:
- We recommend using on ly coolant ad ­
d itive Gl2++ or Gl3 for your vehicle .
This coolant additive is availab le at au­
thor ized Audi dealers . Other types of
ant ifreeze can s ignificant ly reduce cor­
rosion protection. The resulti ng cor ro­
sion can ca use a loss o f coolan t and se­
rio us engine damage.
- Do not add any type of rad iator leak seal­
a nt to yo ur vehicle 's engine coolant.
Add ing radiator repai r fl ui d may adverse ­
ly affect the function and performance of
your cooling system and co uld resu lt in
damage not covered by yo ur New Vehicle
Limited Warranty.
-

,....,
N ,....,
N
0 J:
'SI: ,...., \!) ..,.,
,...., ..,., ,....,
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance .
Fig. 204 Eng ine compartme nt: cover o n the coolant
expansion tank
Before you check anything in the engine com­
partment,
a lway s read and he ed all WARN ­
INGS ¢ & in Working in the engine compart­
ment on page 228.
Park your vehicle on a level surface.
~ Switch off the ignition.
~ Read the engine coolant leve l from the cool­
ant expansion tank¢
fig. 204, ¢ page 230.
With a cold engine, the coolant level should
be between the "min" and "max" markings.
When the engine is warm, the level may be sl ightly above the ''max" marking.
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration ¢
page 230 .
To obtain an accurate reading, the engine
must be switched off.
The expansio n tank in your vehicle is equipped
with an electric coolant level sensor.
When t he coo lant level is too low, the warning
light in the Auto-Check System¢
page 15 will
illuminate unti l yo u add coolant and the level
has been restored to normal. Even thoug h
there is an electric coolant level sensor, we
still recommend you check the coolant level
from time to time.
Coolant loss
Coolant loss may indicate a leak in the cooling
system. In the event of coolant loss, the cool-
Checkin g and fillin g 237
ing system shou ld be inspected immediately
by your authorized Audi dealer . It is not
eno ugh merely to add coo lant .
In a
s ealed system, losses can occu r on ly if
the boiling point of the coo lant is exceeded as
a resu lt of overheating.
A WARNING
The cooling system is under pressure and
can get very hot. Red uce the risk of scald­
ing from hot coolant by follow ing these
steps.
- Turn off the engine and allow it to cool
down.
- Protect your face, hands and arms from
escaping flu id a nd steam by cover ing the
cap with a la rge, th ick rag.
- Turn the cap slowly and very carefully in
a counter-clockwise d irect ion while ap­
p lyi ng lig ht, dow nward pressure on the
top of the cap.
- To avo id being burned, do not sp ill anti­
freeze o r coolan t on the exhaust system
or ho t engine parts. Und er certa in cond i­
tions, the ethylene gly co l in engine coo l­
an t can catch fire.
(D Note
Do not add any type of radiator leak sea l­
ant to your veh icle's engine coo lant. Add­
i ng radia to r repa ir flui d may adverse ly af­
fe ct the fun ct io n and perfor man ce o f you r
coo ling system and could result in damage
not cove red by your New Vehicle Limi ted
War ranty.
Adding coolant
Be very careful when adding engine coolant .
Before you che ck a nyt hing in the eng ine com­
partmen t,
alway s re ad and he ed alt WARN­
INGS ¢ & in Working in the engine compart­
ment on page 228.
~ Requirement: There must be a residua l
a mo unt of coolan t in the expansion ta nk
¢(D.
~Tu rnoff the engine . •
•

238 Check ing and filling
• Let the engine coo l down .
• Place a thick rag over the coolant expansion
tank
¢ page 237, fig . 204 and care full y
twist the cap counter-clockwise¢ _&..
• Add coolant mixed in the correct ratio
¢
page 236, Coolant up to the MAX mark­
i ng.
• Make sure that the fluid level rema ins sta-
ble. Add more coolant if necessary.
• Twist the cap on again
tightly.
Replacement engine coolant must conform to
exact specifications ¢
page 236, Coolant.
We recommend using only coolant additive
G12++, G13 or in an emergency G12+ . Do not
use a different additive . In an emergency use
p la in water unt il you can get the correct add i­
tive 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 co ld antifreeze
and cold water only when the engine is co ld.
Always use
new eng ine coolant when refilling .
Do not fi ll coolant above the "MAX" mark. Ex­
cess coolant will be forced out through the pressure relief valve in the cap when the en­
g ine becomes hot .
A WARNING
- T he coo ling system is under p ressure and
can get very hot. Reduce the risk of
scalding from ho t coolant by following
these steps.
-Turn off the eng ine and a llow it to cool
down.
- Protect your face, hands and arms from escaping flu id and steam by cover ing
the cap with a large, thick rag.
- T urn the cap slowly and very carefully
in a counter-clockwise d irect ion while
apply ing light, downward pressure 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 certa in cond
it ions, the ethylene g lycol in en­
gine coolant can catch fire.
- Antifreeze is poisonous . A lways store an­
tifreeze in its origina l container and well
out of the reach of children.
- If you dra in the coo lant, it must be
caught and safely stored in a proper con­
tainer clearly marked "po ison".
@ Note
- Do not add coolant if the expansion tank
is empty. Air co uld enter the cooling sys­
tem and damage the engine. If this is
the case, do not cont inue driving. Seek
professional assistance .
- Coo lant pollutes the environment and
cou ld cause an engine f ire. 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 eme rgency, only wate r can be
added, the co rrect ratio between water
and antifreeze ¢
page 236 must be re­
stored as soon as possible.
@ For the sake of the environment
D rained coolant should not be reused . Al­
ways d ispose of used coolant while observ­
i ng all envi ro nmental regula tions.
Radiator fan
The radiator fan switches on automatically by
itself
The rad iator fan is driven by the e ngine via the
V-belt. The viscous clutch regulates the speed of the fan acco rding to the temperatu re of the
coolant.
An auxiliary electric radiato r fan* sw itches on
and off depending on coolant temperature
and ot her vehicle ope rat ing condit io ns.
After you switch the eng ine off, the aux iliary
fan can continue running for up to 10 m inutes
- even w ith the ignition off .
It can even switch
o n aga in later by itself¢.& , if
1111>