2015 AUDI RS5 CABRIOLET ESP

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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.
T he cooling system has been filled at the fac­
tory with a permanent coolant which does not need to be changed. The coolan t consists of a
mixture of specially 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 Ca nadian
models) . Th is 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 a lso raises the boil­
ing point of the coo lant.
D o not reduce the concentration o f the coo l­
ant in the summer by adding plain water .
The
proportion of coolant additive mu st be at
least 50 % but not more than 60 %
to main­
tain antifree ze protection and cooling efficien­
cy. If the coolant frost protect ion is too low,
the coolant could freeze and damage the veh i­
cle heating and eng ine cooling system .
For year-round driving, antifree ze is added at
the factory for temperatures down to:
- -31° F(-35°C)USA
- - 4 0 ° F ( -40 °C) Canada.
I f you must add coo lant, use a m ixture of wa­
ter and coolant addit ive. Mixing the coolant
addi tive wi th disti lled wate r is recommended.
A WARNING
Be fore yo u check any thing in the engine
compartment, always read and heed all
WARNI NGS
~ .&. in Working in the engine
compartment on page 195.
(D Note
- Befo re win ter sets in, have the coolan t
checked to see if t he coolant ad dit ive in
-
Checkin g and fillin g 201
your vehicle is sufficient to meet the cli ­
mate conditions . This is especia lly impor ­
tant if you live in a region where the win ­
ter is extreme ly co ld. If necessary, in­
c rease the p ropo rtion of coo lant add itive
to 60% .
- When adding coolant additive to your
cooling system, remember:
- We re commend using on ly coola nt ad­
d itive G 12++ or G 13 for your veh icle .
T his coolan t ad di tive is availab le a t au­
thor ized Audi dealers. Other types of
antifreeze can significantly reduce cor ­
rosion protection. The resulting corro­
sion can cause a loss of coolant and se­
rious engine damage .
- Do not add any type of rad iator leak seal­
ant to your vehicle's engi ne coolant .
Add ing radiator repa ir flu id may adverse ­
ly affect the f unction and performance of
your cooling system and cou ld resu lt in
damage not covered by you r New Ve hicle
Li mited War ran ty.
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@ For the sake of the environment
Because of the pr oblem of proper d isposa l
of brake flu id as we ll as the special tools
requ ired and the necessary expert ise, we
recommend that you have the brake fluid
changed by your author ized Audi dealer .
Battery
General information
Under normal operating conditions, the bat­
tery in your Audi does not need any mainte ­
nance. With
high outside temperatures or
long daily dr ives we recommend that you have
the electro lyte level checked by an authorized
Aud i dealer or qualified workshop . The elec­
trolyte leve l should also be checked each time
the battery is charged c>
page 207.
Have the battery checked when you take your
ve hicle in for service . You are well adv ised to
replace a battery that is older than 5 yea rs .
W ith certa in types of a irbag deployment, t he
battery is d isconnected from the vehicle elec­
tr ica l system for safety reasons c>
.&. in Re­
pair, care and disposal of the airbags on
page 144.
Disconnecting the battery terminals
Some vehicle functions (power w indow regu­
lators, for example) are lost if the battery ter­
m inals a re d isconnected. These func tions have
to be re lea rned after the batte ry term inals a re
connected agai n. T o prevent this, the bat tery
should only be d isconnec ted from the vehicle
e lec tric al system when absolu tely necessa ry
for repairs .
Vehicles not driven for long periods
If you do not drive you r vehicle over a period
of severa l days or weeks, elec trical compo­
nen ts are gr adually cut b ack o r swi tched off .
This redu ces energy cons umption and main­
tains starting capab ility over a longer per io d
c> page 177.
Some o f the conven ience f unctions m ay not
ope rate, su ch as the in ter ior lig hts or t he
Checkin g and fillin g 205
power seat adjus tment. The convenience
funct io ns w ill be available again when yo u
turn o n the ign ition and start the engine.
Winter operation
D ur ing the w inte r mon ths, bat tery capa city
tends to dec rease as tempera tures drop . This
is beca use more power is a lso consumed wh ile
starting, and the headlights, rear window de­
fogger, etc., are used more often.
Avoid unnecessary powe r consumpt ion, pa r­
ticular ly in city traffic or when traveling only
sho rt distances. Let yo ur authorized A udi
dealer check the capacity of the vehicle bat ­
tery before w inter sets inc>
page 207. A well
charged battery will not on ly prevent starti ng
problems w hen the weather is cold, but w ill
also last longer.
@ Tips
If your vehicle is left standing for seve ral
weeks at extremely low temperatures, the
vehicle battery s hou ld be removed and
stored where it will not freeze . This will
p revent it from be ing damaged and having
to be repla ced.
Working on the battery
Be especially careful when working on or near
the bat tery.
The battery is located in the luggage compar t­
ment under the floor . B efo re you che ck any­
thi ng in the luggage compartment,
read and
heed all WARNINGS
c> ,&. .
Always heed the safety warnings , when work­
i ng on the veh icle batte ry or t he vehicle e lec­
t rical sys tem to p reven t inju ry.
The following WARNINGS are very
important when working on the battery:
Always heed the following WARNING SYM· BO LS and safety precautions when working
on the battery .
®
Always wear eye protection.
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208 Check ing and filling
- To r educe the danger of explosion, never
co nnect or disconn ect cha rger cables
wh ile the c harger is operating.
- Fast char ging a battery is dangerous and
shou ld on ly be attempted by a compe­
tent technician w ith the proper equip­
ment .
- Battery acid that may spill during charg­
ing should be washed
off with a solution
of warm water and baking soda to neu ­
tralize the acid.
(Q) Note
Never use a fast charger as a booster to
start the engine . This will seriously dam­
age sensitive electronic components, such
as control units, relays, rad io, etc., as we ll
as the battery charger.
Battery replacement
The new battery must have the same specif/·
cations and dimensions as the original equip­
ment battery.
Intell igent energy management in your veh i­
cle is respons ible for d istributing the e lectr i­
cal energy throughout you r vehicle
q page 177. The intell igen t energy m anage­
men t system w ill keep the engine ba tte ry
charged better then vehicles w ithout this sys­
tem . To make sure the additional e lectrica l en­
ergy is available once again after you have
changed the battery, we recommend that you install batteries o f the same type and ma nu­
facture only (the same as those installed at
the time your vehicle was delivered). Specifi­
cations are listed on the battery hous ing. Your
author ized Audi dealer must code the battery
in the ene rgy management system to enable
you to use the energy management functions
correctly after replac ing the battery.
I f it is not poss ible to use a battery of this
type, the new bat tery m ust h ave the s ame ca­
pac ity, voltage ( 12-volts), amperage, con ­
struction and plug sea ling. When installing the battery, make su
re the ig ­
nition and a ll electrical consumers are turned
off.
(D Note
Make sure the ventilation hose on the side
of the battery is connected, otherwise
fumes or battery acid can leak out .
@ For the sake of the environment
Because o f the p rob lem of p roper disposal
of a battery, we recommend your author ­
i zed Audi dealer change the battery for
you. Batteries contain sulfur ic acid and
l ead and must always be disposed of prop­
erly in comp liance with all environmental
regulations. Dispos ing of vehicle batter ies
i mprope rly is very dange rous to the envi­
r o nment .
Windshield/headlight*
washer container
Fig. 181 En gin e compa rt m en t: Cove r on the w ind·
s h iel d a nd h eadligh t• was her fluid conta in er
.., N
-~ (X) a,
The washer fluid conta iner is marked w ith the
symbol
O on its cap q fig . 181, qpage 197,
fig . 174 .
.. Before yo u check any thing in the engine
compa rtment,
always read and heed all
WARNINGS q A in Working in the engine
compartm ent on page 195 .
.. Lift the fi ller cap tongue to add washer flu­
id. You can f ill the container to the top.
.. Press the cap back onto the filler neck after
fi lling the conta iner .
You can find the reservo ir
capacity in the table
in
q page 262. .,.

Tires and wheels 211
and make of tire and the tread -New tires tend to be slip-•
pattern.
pery and must also be bro-• '
Hidden damage ken-in. To reduce the risk of
Damage to tires and rims is of -losing control, a collision
and serious personal inju-
ten not readily visible. If you ries, drive with special care
notice unusual vibration or the for the first 350 miles
vehicle pulls to one side, this (560 km).
may indicate that one of the -Driving with worn or dam-
tires has been damaged . The
aged tires can lead to loss of
tires must be checked immedi-
ately by an authorized Audi control
, sudden tire failure,
including a blowout and
dealer or qualified workshop.
sudden deflation, crashes
Unidirectional tires and serious personal inju-
A unidirectional tire can be ries. Have worn or damaged
identified by arrows on the tires replaced immediately.
sidewall, that point in the di rec- -Tires age even if they are
tion the tire is designed to ro- not being used and can fail
tate. You must follow the speci- suddenly, especially at high
fied direction of rotation. This is speeds. Tires that are more
necessary so that these tires than 6 years old can only be
can develop their optimum used in an emergency and
characteristics regarding grip, then with special care and
road noise, wear and hydro- at low speed.
planing resistance. For more in- -Never mount used tires on
formation
¢ page 249. your vehicle if you are not sure of their "previous histo-
A WARNING
ry." Old used tires may have -
New tires or tires that are been damaged even though
old, worn or damaged cannot the damage cannot be seen
provide maximum control that can lead to sudden tire
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212 Tires and wheels
-If you notice unusual vibra­
tion or if the vehicle pulls to
one side when driving, al­
ways stop as soon as it is
safe to do so and check the
wheels and tires for dam­
age.
0 Note
-Please note that summer and winter tires are de­
signed for the conditions
that are typical in those sea­
sons. Audi recommends us­
ing winter tires during the
winter months. Low tem­ peratures significantly de­
crease the elasticity of
summer tires, which affects
traction and braking ability. If summer tires are used
in
very cold temperatures, cracks can form on the tread
bars, resulting in perma­
nent tire damage that can
cause loud driving noise and
unbalanced tires. Audi is not
responsible for this type of
damage.
-Burnished, polished or chromed rims must not be used in winter road condi­
tions. The surface of the
rims does not have suffi­
cient corrosion protection
for this and could be perma­
nently damaged by road salt
or similar substances.
Glossary of tire and loading terminology
Accessory weight
means the combined weight (in
excess of those standard items
which may be replaced) of auto­ matic transmission, power
steering, power brakes, power
windows, power seats , radio,
and heater, to the extent that
these items are available as fac­
tory-installed equipment (whether installed or not).
Aspect ratio
means the ratio of the height to
the width of the tire in percent.
Numbers of 55 or lower indi­
cate a low sidewall for im­
proved steering response and
better overall handling on dry
pavement.
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Bead
means the part of the tire that
is made of steel wires, wrapped
or reinforced by ply cords and
that is shaped to fit the rim.
Bead separation
means a breakdown of the bond
between components in the
bead.
Cord
means the strands forming the
plies in the tire .
Cold tire inflation pressure
means the tire pressure recom­
mended by the vehicle manu­
facturer for a tire of a designat­
ed size that has not been driven
for more than a couple of miles (kilometers) at low speeds in
the three hour period before
the tire pressure is measured or
adjusted.
Curb weight
means the weight of a motor
vehicle with standard equip­
ment including the maximum
capacity of fuel, oil, and cool­
ant, air conditioning and addi­
tional weight of optional equip­
ment.
Tires and wheels 213
Extra load tire
means a tire design to operate
at higher loads and at higher inflation pressures than the
corresponding standard tire. Extra load tires may be identi­
fied as "XL", "xl", "EXTRA
LOAD", or "RF" on the sidewall.
Gross Axle Weight Rating ("GAWR")
means the load-carrying capaci­
ty of a single axle system,
measured at the tire-ground in­
terfaces.
Gross Vehicle Weight Rating ("GVWR")
means the maximum total
loaded weight of the vehicle.
Groove
means the space between two
adjacent tread ribs.
Load rating (code)
means the maximum load that
a tire is rated to carry for a giv­
en inflation pressure. You may
not find this information on all
tires because it is not required by law.
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Reinforced tire
means a tire design to operate
at higher loads and at higher
inflation pressures than the
corresponding standard tire. Reinforced tires may be identi­
fied as "XL", "xl", "EXTRA
LOAD", or "RF" on the sidewall.
Rim
means a metal support for a
tire or a tire and tube assembly upon which the tire beads are
seated.
Rim diameter
means nominal diameter of the
bead seat. If you change your
wheel size, you will have to pur­ chase new tires to match the
new rim diameter.
Rim size designation
means rim diameter and width.
Rim width
means nominal distance be­
tween rim flanges.
Sidewall
means that portion of a tire be­
tween the tread and bead.
Tires and wheels 215
Speed rating (letter code)
means the speed at which a tire
is designed to be driven for ex­
tended periods of time. The rat­
ings range from 93 mph
(150 km/h) to 186 mph
(298 km/h)¢
page 232. You
may not find this information
on all tires because it is not re­
quired by law.
The speed rating letter code,
where applicable, is molded on
the tire sidewall and indicates
the maximum permissible road speeds
¢ .& in Winter tires on
page 237.
Tire pressure monitoring
system*
means a system that detects
when one or more of a vehicle's
tires are underinflated and illu­ minates a low tire pressure
warning telltale.
Tread
means that portion of a tire
that comes into contact with
the road.
Tread separation
means pulling away of the
tread from the tire carcass.
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218 Tires and whee ls
Tire pressure generally refers to tant things you can do to help
the amount of a ir in a tire that avoid sudden tire failure. Un-
it needs it to do its job and derinflated tires are a major
safely carry the combined load cause of sudden tire failure .
of the entire vehicle and its con-
Keeping tires at the right pres-
tents . Tire pressure is measured sure is also important for safe
in kilopascals (kPa), the inter- and responsive vehic le han-
national measuring unit and in dling, traction, braking and
pounds pe r square inch (PSI). load carrying.
Tire pressu res
Ti re pressure is based in part on are particularly important
the vehicle's design and load when the vehicle is being driv-
limit -the greatest amount of en at h igher speeds, and then
weight that the vehicle can car-especially when hea vily loaded
ry safely and the tire size. The even within the permissible
proper tire pressure is frequent-load-carrying capacities ap-
ly referred to as the "recom-proved for your vehicle.
mended cold tire inflation pres-
The recommended tire pres-
sure." Air in the tires expands sures for your Audi depend on
when the tire heats up because the kind of tires on your vehicle
of internal friction when it flex- and the number of passengers
es in use. The ti re pressure is
and/or amount of luggage you
h igher when the tire has
will be transporting.
warmed up than when it is
The tire pressure labe l is locat-
"cold." It is the inflation p res-
ed on the driver's side 8-pillar.
sure in a "cold" tire that counts .
Therefore, you should never let The tire pressure label lists the
recommended cold tire infla-
air out of a warm tire to match
"cold tire inflation pressure" tion pressures for the vehicle at
its maximum capacity weight
recommendations . The tires
would then be underinflated and tires that were on your ve-
and cou ld fai l suddenly . hicle at the time it was manu-
f actured.
...
Maintaining proper tire p res-
sure is one of the most impor-