2015 AUDI RS5 COUPE cooling

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specially conditioned water and the manufactur ­
er's glycol-basedcoolant additive Gl3 antifreeze
with anticorrosion add itives (50% for USA mod­
els ; 60% for Canadian models) . This mixture both
assures the necessary frost protection and pro­
tects metal components in the engine's cooling
system from corrosion and scaling . It also raises
the boiling point of the coolant .
Do not reduce the concentration of the coolant in
the summer by adding pla in water .
The propor ­
ti on of coolant additive mu st be at least 50 %
but n ot more than 60 °/o
to maintain antifreeze
p rotec tion and cooling efficiency . If the coolan t
frost protection is too low, the coolant cou ld
freeze and damage the vehicle heating and en­
gine cooling system.
F or year-round driving, antifreeze is added at the
factory for temperatures dow n to:
- - 31 °F (-35 °C) USA
- - 40 °F ( - 40 °C) Canada .
If you m ust add coolant, use a m ixture of water
and coolant additive. Mixing the coolant additive
with distilled water is recommended.
A WARNING
Before you check anything in the engine com­
partment, always read and heed all WARN­
INGS
~ A in Working in the engine compart­
ment on page 187.
(D Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in your
vehicle is suffic ient to meet the climate con­
dit ions . This is especially important if you
l ive in a region where the winter is ex treme-
l y co ld. I f necessary, increase the proport ion
of coo lant add itive to 60%.
- When adding coolant addit ive to your cool ­
ing system, remember:
- We recommend using only coolant addi­
tive Gl2 ++ or Gl3 for your vehicle. This
coola nt add itive is ava ilable at authorized
Audi dea lers. Other types of ant ifreeze can
significant ly reduce corrosion protection .
Check in g and Fillin g
The resulting corrosion can cause a loss o f
coolant and serious engine damage.
- Do not add any type of rad iator leak sealant
to your vehicle's engine coolant . Adding ra­
diator repair fluid may adverse ly affect the
function and performance of your cooling
system and could result in damage not cov­
ered by your New Vehicle Limited Warranty .
Checking the engine coolant level and
adding coolant
Be very careful when adding engine coolant.
Fig . 1 64 Engine compartment: Cover on the coo lant ex­
pans io n tank
Fig . 1 65 Engin e compa rtment: mark in gs in t he coo lant ex­
pan sion tank
Before you check anything in the engine compart­
ment,
a lwa ys read and heed all WARNINGS
~ A in Working in the engine compartment on
page 187.
The "MIN" und "MAX" markings are found on the
bi-level d isc in the interior of the coo lant expan ­
s ion tank~
fig. 165 .
.,. Park yo ur vehicle on a level su rface.
.,. Turn off the ignition.
.,. Let the engine cool down.
193

Checking and Filling
"' Place a thick rag over th e coolant expansion
tank and
carefully turn the cap counter-clock­
wise
¢ ,& .
"'Read the engine coolant level inside the coolan t
expansion tank
¢ fig . 164, ¢page 189,
fig. 16 1.
With a cold engine , the coolant level
should be between the ' 'MIN" and "MAX " mark­
ings
¢ fig . 165 -arrows- . When the engine is
warm, the level may be slightly above the
"MAX" marking.
"'Add coolant mixed in the correct ratio, if neces­
sary ¢
page 192 . Coolant may be a maximum
of 1 mm above the MAX marking.
"' Twist the cap on again
tightly .
The location of the coolant expansion tank can be
seen in the engine compartment illustration
¢ page 189.
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 17 will
blink until you add coolant and the level has been
restored to normal. Even though there is an elec­
tric 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.
Adding coolant
Replacement engine coolant must conform to ex­
act specifications ¢
page 192, Coolant.
We recommend using only coolant additive Gl2+
+ , G l3
or in an emergency Gl2+ . Do not use a
different additive . In an emergency use plain wa­
ter until you can get the correct additive and can
194
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 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
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 anti ­
freeze or coolant on the exhaust system or
hot engine parts. Under certain condi­
tions, the ethylene glycol in engine cool­
ant can catch fire.
- Antifreeze is poisonous. Always store anti­
freeze 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 container
clearly marked "poison".
(D Note
- Do not add any type of radiator leak sealant
to your vehicle's engine coolant. Adding ra­
diator repair fluid may adversely affect the
function and performance of your cooling
system and could result in damage not cov­
ered by your New Vehicle Limited Warranty.
- Coolant pollutes the environment and could
-
cause an engine fire. Excess coolant will be .,.

Index
Child seats
155
Secur ing . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 9
C igarette lig hte r . . . . . . . . . . . . . . . . . . . . . . . 58
Clean ing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181
Climate contro l sys tem . . . . . . . . . . . . . . . . . 67
Automatic rec irculation . . . . . . . . . . . . . . . . 70
synchron izing . . . . . . . . . . . . . . . . . . . . . . . . 70
C lo ck . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Closing Sun blind · · · · .. ................ ... .. 39
C losing/opening
at t he lock cylinder . . . . . . . . . . . . . . . . . . . . 35
by remote contro l . . . . . . . . . . . . . . . . . . . . 33
with the central locking switch . . . . . . . . . . 34
with the convenie nce key . . . . . . . . . . . . . . . 33
Com ing home . . . . . . . . . . . . . . . . . . . . . . . . . 44
Compa rtments . . . . . . . . . . . . . . . . . . . . . . . . 60
Compass in the mirror . . . . . . . . . . . . . . . . . . 51
Comp liance . . . . . . . . . . . . . . . . . . . . . . . . . . 239
Consume r information . . . . . . . . . . . . . . . . . 236
Consumer Information . . . . . . . . . . . . . . . . . 1 18
Con ta ct ing NHT SA . . . . . . . . . . . . . . . . . . . . 118
Convenience key Indicator lights . . . . . . . . . . . . . . . . . . . . . . 7 5
Starti ng engine (START ENGIN E STO P but-
ton) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
St opping the engine (S TA RT E NGINE STOP
button) · . .. .. ............... .. .. .. .. 7 4
Switching on ignition . . . . . . . . . . . . . . . . . . 73
un locking/ locking . . . . . . . . . . . . . . . . . . . . 33
Conven ience open ing/ closing . . . . . . . . . . . . 38
Convertible child safety seats . . . . . . . . . . . 156
Conve rtible locking re trac to r
Ac tiva ting . . . . . . . . . . . . . . . . . . . . . . . . . . 161
D eactivating . . . . . . . . . . . . . . . . . . . . . . . . 162
Using to secure a child safety seat . . . . . . 161
Coolan t sys tem . . . . . . . . . . . . . . . . . . . . . . . 192
Cooling mode (automatic climate control) . . 68
Cooling System Expansion tank . . . . . . . . . . . . . . . . . . . . . . 193
Corneri ng light . . . . . . . . . . . . . . . . . . . . . . . . 43
Cruise control
Changing speed . . . . . . . . . . . . . . . . . . . . . . 79
Presetting your speed . . . . . . . . . . . . . . . . . 79
Sw itching off . . . . . . . . . . . . . . . . . . . . . . . . 79
Sw itchi ng on . . . . . . . . . . . . . . . . . . . . . . . . . 78
242
Cruising range . . . . . . . . . . . . . . . . . . . . . . . . . 24
(upholder . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
D
Data recorder
Date disp lay 168
12
Daytime runn ing lig hts ............... 43, 44
Declarat ion of compliance
Adaptive cruise control . . . . . . . . . . . . . . . 239
Audi side ass ist . . . . . . . . . . . . . . . . . . . . . 239
Cell phone package . . . . . . . . . . . . . . . . . . 239
Convenience key . . . . . . . . . . . . . . . . . . . . . 239
El ec tronic immob ilizer. . . . . . . . . . . . . . . . 239
Homelin k unive rsal remote con trol . . . . . 239
Remote con trol key . . . . . . . . . . . . . . . . . . 2 39
Defect ive light bulb wa rning . . . . . . . . . . . . . 21
Defrost ing (windows) . . . . . . . . . . . . . . . . . . . 69
Dete rm ining co rrec t load limit . . . . . . . . . . 209
D igital clock . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Digital compass . . . . . . . . . . . . . . . . . . . . . . . 51
D ime nsions . . . . . . . . . . . . . . . . . . . . . . . . . . 234
D imm ing th e rearv iew mirror . . . . . . . . . . . . 47
Doors emergency locking . . . . . . . . . . . . . . . . . . . . 35
D river info rmat ion system . . . . . . . . . . . . . . . 23
En gine o il temperat ure indicator . . . . . . . . 26
Open door o r fron t lid wa rn ing . . . . . . . . . . 23
Outs ide temperature disp lay . . . . . . . . . . . . 23
Soun d system disp lay . . . . . . . . . . . . . . . . . 23
D river seat
refer to Seating position ............ . .
Driving econom ically .............. .. . .
Driving safely ..... .. .. ... ..... ... .. . .
D rivi ng throug h water 112
179
111
177
D riving time . . . . . . . . . . . . . . . . . . . . . . . . . . 24
D ust filte r
refer to Poll uta nt fil ter (autom atic A/C sys -
tem) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Dynam ic steeri ng .. .. .. ... .. .. 101, 169, 174
E
Easy entry funct ion . . . . . . . . . . . . . . . . . . . . . 55
E lectro-mechan ica l powe r assist . . . . . . . . . 17 4