2016 AUDI S8 radiator cap

Checking and Filling
Checking and Filling
Hood
Releasing the engine hood
The engine hood is released from inside the vehi­
cle .
Fig. 194 Driver footwell : release leve r
Fig. 195 Ro cker switc h under the hood
Make sure the wiper arms are not raised up from
the windshield . Otherwise the paint could be
damaged .
.. With the driver's door open, pu ll the lever un ­
der the instrument panel in the direction of the
arrow ¢
fig. 194.
.. Raise the hood slightly Q _A .
.. Press the rocker switch under the hood upward
Q fig. 195. This releases the catch.
.. Open the hood.
A WARNING
Hot engine coo lant can burn you .
- To reduce the risk of be ing burned, never
open the hood if you see or hear steam or
coolant escaping from the eng ine compart­
ment. Wait unt il no steam or coolant can be
220
seen or heard before carefully open ing the
hood.
Working in the engine compartment
Be especially careful whenever you work in the
engine comportment.
Whenev er yo u mu st perform an y work in the
engin e compartment , for exampl e chec king and
filli ng d iffe rent fl uids , the re is a ri sk of injur y,
bu rn s and accid ent s. T o preven t perso na l injur y
alway s obse rve the foll owing WARNING S. The
en gine compartment o f an y v ehicl e is a haz ard ­
ou s a rea
Q _6 .
A WARNING
To help avoid injury, before you check any­
thing under the hood:
- Turn off the engine .
- Switch off the ignit ion.
- Apply the parking brake.
- Move selector lever to "P" (Park).
-Always let the eng ine cool down. Hot com-
ponents will burn skin on contact .
-
-To redu ce the risk of being burned, never
open the hood if you see or hear steam or
coo lant escaping from the engine compart­
ment . Wait until no steam or coolant can be
seen or heard before carefully opening the
hood.
- Keep children away from the engine com­
partment .
- Never sp ill fluids on hot engine compo­
nents. They can cause a fire.
- Never touch the radiator fan. The auxiliary
electric fan is temperature controlled and
can switch on suddenly.
- Never open the coolant reservoir cap when
the engine is sti ll warm. The coolant system
is pressurized and hot coolant could spray
out.
- Protect your face, hands and arm from
steam or hot engine coolant by placing a
thick rag over the cap when you open the
coolant reservoir .

Checking and Filling
the engine is warm, the level may be slightly above the "max" marking.
The location of the coolant expansion tank can be
seen in the engine compartment illustration
¢ page 222.
To obtain an accurate reading, the engine must
be switched off.
The expansion tank in your vehicle is equipped
with an electric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System¢
page 15 will il­
luminate until you add coolant and the level has
been restored to normal. Even though 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 cooling
system should be inspected immediately by your
authorized 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 re­
sult of overheating.
_& 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 it to cool
down.
- Protect your face, hands and arms from es­
caping 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 anti­
freeze or coolant on the exhaust system or
hot engine parts. Under certain conditions,
the ethylene glycol in engine coolant can
catch fire.
228
(D Note
Do not add any type of radiator leak sealant
to your vehicle's engine coolant. Adding radia­
tor repair fluid may adversely affect the func­
tion and performance of your cooling system
and could result in damage not covered by
your New Vehicle Limited Warranty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the engine compart­
ment,
always read and heed all WARNINGS
¢.& in Working in the engine compartment on
page 220 .
.. Requirement: There must be a residual amount
of coolant in the expansion tank ¢(D .
.. Turn off the engine .
.. Let the engine cool down .
.. Place a thick rag over the coolant expansion
tank ¢
page 22 7, fig. 201 and carefully twist
the cap counter-clockwise ¢&, .
.,. Add coolant mixed in the correct ratio
r::!> page 22 7, Coolant up to the MAX marking.
.. Make sure that the fluid level remains stable.
Add more coolant if necessary .
.. Twist the cap on again
tightly.
Replacement engine coolant must conform to ex­
act specifications ¢
page 22 7, Coolant.
We recommend using only coolant additive G12+
+, G13 or in an emergency G12+ . Do
not use a
different additive. In an emergency use plain wa­
ter 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 cool­
ant, then you should add cold antifreeze and cold
water only when the engine is cold.
Always use
new engine coolant when refilling.
Do not fill coolant above the "MAX" mark . Excess
coolant will be forced out through the pressure
relief valve in the cap when the engine becomes
hot.
~

& WARNING
-The cooling system is under pressure and
can get very hot. Reduce the risk of scald ing
from hot coolant by following these steps.
- Turn off the engine and allow it to coo l
down.
- Protect your face, hands and arms from
escaping flu id and steam by cover ing the
cap w ith a la rge, thick rag.
- Turn the cap slowly and very carefully in a
counter-clockwise d irection while applying
light, downward p ressure on t he top of
the cap.
- T o avoid bei ng bu rned, do not spill anti­
free ze or coo la nt on the e xhaust sys tem or
hot engi ne parts. Under certa in cond i­
tions, the ethylene glycol in eng ine cool ­
ant can catch fire .
- An tifreeze is poisonous. Always store anti­
freeze in its original con tainer and well ou t
of the reach of children.
- If you dra in the coolant, it m ust be ca ught
and safely stored in a proper conta iner
clearly marked "poison" .
(D Note
-Do no t add coolant if the expa nsion tank is
empty. Air cou ld enter the cooling sys tem
and damage the eng ine. If this is the case,
do not continue driving. Seek professional
ass istance.
- Coolant po llutes the environment and could
ca use an eng ine fire . Excess coolant will be
fo rced o ut through the pressure relief valve
i n the cap when the eng ine becomes hot.
- If, in an emergency, only wate r can be add­
ed, the correct ratio between water and an­
tifreeze¢
page 22 7 must be restored as
soon as possib le.
@) For the sake of the environment
Drained coolant sho uld not be reused. Always
dispose of used coolant while observing all
,...,
"' environmental regulat io ns. 0 J:
'SI: ,..., -
Ch eck ing and Filling
Rad iator fan
The radiator fan switches on automatically by it­
self .
The radiator fan is driven by the engine via the V­
belt. The v iscous clutch regulates t he speed of
the fan accord ing to the temperature of the cool­
ant .
An auxiliary e lectr ic radiator fan* sw itches on and
off depend ing o n coo lant temperature and other
vehicle operating conditions.
After you switch the engine off, the auxiliary fan
can continue ru nning for up to 10 m inutes -even
with the ignition off. It can even switch on aga in
later by itself¢,& , if
- the temperature of the engine coolant rises due
to the heat build-up from the engine in the en­
gine compartment, or
- the engine compartment heats up beca use the
veh icle is parked in intense sunlight.
& WARNING
- To reduce the r isk of persona l injury neve r
touch the radia to r fan .
- The auxiliary e lectr ic fan is temperature
controlled and can switch on s uddenly even
when the engine is not ru nning .
- The a uxiliary radiator fan sw itches on auto­
mat ically when the eng ine coolant reaches a
certa in temperature a nd will continue to run
until the coolant temperature d rops.
229

Prewarming . . . . . . . . . . . . . . . . . . . . . . . . . . 81
Proper occupant seating positions . . . . . . . 130
Proper safety belt position . . . . . . . . . . . . . . 142
Proper seating position
Fr ont passenger . . . . . . . . . . . . . . . . . . . . . 131
Occupants . . . . . . . . . . . . . . . . . . . . . . . . . . 130
Rear passengers . . . . . . . . . . . . . . . . . . . . . 132
Protecting 208
Q
quattro
refer to All Wheel Drive . . . . . . . . . . . . . . . 195
Question What happens to unbelted occupants? 139
R
Radiator fan . . . . . . . . . . . . . . . . . . . . . . . . . 229
Radio clock . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Rain/light sensor Headlights . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Intermittent (windshield wipers) . . . . . . . . 54
Sensor defective . . . . . . . . . . . . . . . . . . . . . . 22
Raising the vehicle . . . . . . . . . . . . . . . . . . . . 275
Range (fuel level) . . . . . . . . . . . . . . . . . . . . . . 24
Reading lights . . . . . . . . . . . . . . . . . . . . . . . . . 50
Rearfoglights . .. ............. .. .. .. .. 46
Rear lid Escape hand le . . . . . . . . . . . . . . . . . . . . . . 256
Rear light Defective . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Rear seats Adjusting individual seats . . . . . . . . . . . . . . 61
Entry assistance . . . . . . . . . . . . . . . . . . . . . . 64
Front passenger seat adjustment . . . . . . . . 64
Reclining rear seat . . . . . . . . . . . . . . . . . . . . 61
Rear view mirror . . . . . . . . . . . . . . . . . . . . . . . 52
Rear window heating . . . . . . . . . . . . . . . . . . . 78
Recirculation mode (automatic climate con-
trol) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77
Reclining rear seat . . . . . . . . . . . . . . . . . . . . . 61
Recuperation . . . . . . . . . . . . . . . . . . . . . . . . . 24
Refilling AdBlue With bottle. .. ................ .... .. 218
With canister . . . . . . . . . . . . . . . . . . . . . . . 218
Index
Refrigerator
Operating . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
Refuelling . . . . . . . . . . . . . . . . . . . . . . . . . . . 214
Remote control Garage door opener (Homelink) . . . . . . . . . 44
Massage function . . . . . . . . . . . . . . . . . . . . . 63
Unlocking and locking . . . . . . . . . . . . . . . . . 33
Remote luggage compartment lid release . . 36
Repair manuals . . . . . . . . . . . . . . . . . . . . . . . 281
Repairs Airbag system . . . . . . . . . . . . . . . . . . . . . . 159
R eplacing
Light bulbs . . . . . . . . . . . . . . . . . . . . . . . . . 270
Windshield wiper blades . . . . . . . . . . . . . . . 55
Reporting Safety Defects ........... 136, 137
Request to warm engine by driving Warn ing/ indicator lights . . . . . . . . . . . . . . . 21
Reset button . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Retractor . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141
Reverse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112
Rims . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 207
Roof rack . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Loading........... ................. . 71
Roof weight . . . . . . . . . . . . . . . . . . . . . . . . . 71
s
SAFE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Safe driving habits . . . . . . . . . . . . . . . . . . . . 129
Safety Airbag system . . . . . . . . . . . . . . . . . . . . . . 146
Belts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138
Cargo . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135
Correct seating posit ion . . . . . . . . . . . . . . 130
Pedal area . . . . . . . . . . . . . . . . . . . . . . . . . . 134
Safety belt position . . . . . . . . . . . . . . . . . . . 142
Safety belts worn by pregnant women . . . 143
Safety belt pretensioner
Service and disposal . . . . . . . . . . . . . . . . . . 145
Safety belt pretensioners Pre sense . . . . . . . . . . . . . . . . . . . . . . . . . . 187
Safety belts . . . . . . . . . . . . . . . . . . . . . . 138, 141
Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . . 143
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . 208
Danger to passengers who do not wear a
safety belt . . . . . . . . . . . . . . . . . . . . . . . . . 139
293