2015 AUDI RS5 CABRIOLET coolant temperature

10 Instruments and warning/indicator lights
Instruments and warning/indicator Lights
Instruments
Instrument cluster and controls
The instrument cluster is your central source of information.
Fig. 3 Ove rv iew of the instrument cluster
CD Coolant temperature gauge .. .
@ Tachometer ........... .. .. .
@ Warning/indicator lights .. .. .
© ISETlbutton .... .... .. .... . .
® Display
- Driver information system .. .
- Time and date d isplay .. .. .. .
- Odometer .......... ... .. .
@ Reset button for trip odometer
(z) Speedometer
@ Fuel gauge . .... ..... .. .. .. .
(D Tips
10
11
13
11
23
12
12
12
12
- When switching the ignition on, the nee­
dles in the instrument cluster swing up­
ward briefly.
- The illumination for the instrument clus­
ter lights up whenever you switch on the
i gnition with the
vehicle headlights off .
As the daylight fades, the instrument
cluster illumination likewise dims auto­
matically a nd will go out completely
when the outside light is
very low. This
feature is meant to remind you to switch
on the headlights when outside light
conditions become poor .
Engine coolant temperature gauge
The engine coolant gauge q page 10, fig. 3 CD
only works when the ignition is on. To prevent
damage to your engine, please note the fol ­
lowing important points:
Engine cold
If the needle is at or close to the bottom of
the gauge, the engine has not yet reached its
operating temperature. Avoid high engine
speeds, heavy engine loads, and heavy throt ­
tle app lications.
Normal temperature
When the engine has reached its operating
temperature, the needle will
move to the mid­
dle of the gauge and remain there . If the en­
gine is working hard at high outs ide tempera­
tures, the needle may
move higher on the
gauge. This is not a cause for concern as long
as the . warn ing light in the instrument
cluster display does not illuminate. If the.
warning light in the instrument cluster dis­
play flashes, this can mean one of two things:
either the coolant
temperature is too high, or
the coolant
level is too low¢ page 17 Ill-

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Instrument s and warning /indicator lights 11
A WARNING
- Always observe the warning in
c::> page 195 , before opening the hood
and checking the engine coolant level.
- Never open the engine hood if you see or
hear steam, or if you see engine coolant
dripping from the engine compartment.
You could burn yourself. Let the engine
cool off first so that you cannot hear or
see any steam or engine coolant .
(D Note
-Mounting additional lights or accessories
in front of the air inlets reduces the cool­
ing effect of the rad iator. At high outside
temperatures or high eng ine load , the
engine could overheat.
- The front spoiler has been designed to
properly distribute the cooling air when
the veh icle is moving .
If the spoiler is
damaged , this cou ld reduce the cooling
effect and the engine co uld then over­
heat. Ask your authorized Aud i dealer for
assistance.
Tachometer (engine rev counter)
The tachometer indicates the engine RPM
(revolutions per minutes).
I f engine RPM drops below 1,500, you should
downshift to the next lower gear . T he red area
at the end of the scale indicates maximum
perm issible engine RPM after the break-in pe­
riod. Before reaching this area, move these­
lector lever to position 0/5 or ease your foot
off the accelerator pedal.
@) Note
The tachometer needle@c::> page 10 ,
fig. 3 shou ld only briefly be in the red
zone: you could damage your engine! The
beg inning of the red zone varies depend-
ing on the engine .
@) For the sake of the environment
Upshifting early saves fuel and reduces en­
gine noise.
~ button
Fig. 4 SET button in th e ins trume nt cluster
The !SET ! button performs the following func­
tions:
Switching on time, date, temperature
display and odometer
The display appears for approximate ly 30 sec­
onds when you press the
I S ET ! button c::> fig . 4
with the ignit ion off .
Starting the Auto-Check sequence
The Auto-Check system constantly monitors
certa in individual functions and components
of the vehicle when the ignition is turned on
and when the vehicle is moving .
With the ignition turned on, you can start the "Auto-Check sequence" by pressing the
! SE T!
button . You can perform an Auto-Check se­
quence when the vehicle is stationary and the
ignition is turned on or when the vehicle is
moving slower than 3 mph (5 km/h).
In addition, the number of keys initialised for
your vehicle is displayed.
L2 3 /3 means that
three keys have been initialised . This feature
enables used car buyers to make sure they
have received all of the keys.
If you are given only two keys, for ins tance ,
you should take the vehicle and the ex isting
keys to an authorized Audi dealer to have the
missing key d isabled .
It is also important to
notify your insurance company about the loss.
Setting the speed warning
By pressing the !SET ! button briefly, you can
set threshold 1 of the speed warning wh ile
you are driving
c::> page 80 . By maintaining II>

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Instruments and warning/indicator lights 17
9::;r: Engine oil pressure
The red engine oil pressure warning symbol
requires immediate service or repair . Driving
with a low-oil-pressure indication is likely to
inflict severe damage to the engine.
• Turn off engine! Oil pressure too low
If the indicator lig ht t urns on and the mes­
sage appears, the oil pressu re is too low.
~ P ull off the road.
~ Stop t he vehicle .
~ Turnoff the engine.
~ Check the engine oil level¢ page 199.
~ If the engi ne oil leve l is too low, add engine
o il ¢
page 199. M ake sure that the oil p res­
s ur e warning symbol. appea rs no longe r
in t he di sp lay before y ou s tart driving aga in.
~ If the engi ne oil leve l is corr ect and the in di­
cat or lig ht still tur ns o n, tur n t he eng ine
off
and do not contin ue d riving . Seek professio ­
nal assistance.
(D Tips
- The engine oil pressure symbol. is
not an indicator for a low engine oil lev­
el. Do not rely on it. Instead, check the
oil level in your engine at regular inter ­
vals, preferably each time you refuel,
and always before going on a long trip.
- The yellow oil level warning indication
II requires oil refill or workshop serv­
ice without delay. Do not wait until the
red oil pressure warning. starts to
flash before you respond to the low oil level warning
El . By then, your engine
may already have suffered serious dam­
age .
~ . Engine oil level
• WARNING : Please add oil immediately
If th e i ndi cator lig ht and the message appear,
add engine o il imme diate ly
¢page 197.
El Add oil, max XXXX l. You may cont . driv .
When the symbol Ill and dr iver message ap ­
p ear, add the amount of oil appearing in the
display at the next opportunity ¢
page 197 .
-L Engine cooling system
A malfunction in the engine cooling system
must be rep aired as soon as possible.
• Turn off engine and check coolant level
If th e i ndica to r li ght turns on and the m es­
sage appea rs, t he coolan t temperature is too
high o r th e coolan t leve l is to o low.
~ Pull off t h e road.
~ Stop the vehicle.
~ Tu rnoff the engi ne.
~ Che ck cool ant leve l.
~ Add coo lant if necessary¢ page 202.
~ Con tinue dr iv ing o nly afte r the engine cool ­
ant warning/indicator light goes out .
~ Contact your authorized Audi dealer for as-
sistance if necessa ry .
If the engi ne coo lant level is correct, t hen the
r adiator fan may be the ca use of t he malfunc­
tion.
A WARNING
- If you r vehicle should brea k dow n for
mechanical or other reaso ns, park at a
safe d istance fro m moving traffic, tu rn
off th e e ngin e and tu rn o n the haza rd
war ning lig hts¢
page 53, Eme rge ncy
fl as her s.
-
- Nev e r ope n the hood if y ou s ee or he ar
st eam or cool ant esc aping fro m the en­
g in e c omp artmen t - y ou risk b ein g sc ald ­
e d. Wa it unt il you c an no lo nger see o r
hea r steam o r coolant escap ing .
- Th e engi ne comp artme nt of any vehi cle
is a dan ger ous are a. B efo re you pe rform
a ny work in the engi ne com partment,
tur n of t he engine and allow it to coo l.
Follow t he warn ing sticke rs ¢
pag e 195.

196 Checking and filling
-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:
- 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 of automatic trans­
mission 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 hazards~& .
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.
- 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 .
(I) 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.

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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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pressure relie f 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
sca lding from hot coolant by following
these steps .
- T urn off the engine and a llow it to cool
down.
- Protect your face, hands and arms from
escap ing flu id and steam by cover ing
the cap with a large, thick rag.
- Tu rn the cap slowly and very ca refully
in a counte r-clockw ise d irection while
applying light, downward p ress ure 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 certain
conditions, the ethylene glyco l in en­
g ine coolant can catch f ire.
- Antifreeze is poisonous. Always store an­
t ifreeze in its or iginal container and we ll
out of the reach of children.
- If you drain the coolant, it must be
caught and safely stored in a proper con­
tainer clear ly marked "poison".
Q) Note
- Do not add any type of radiator leak sea l­
ant to your veh icle's engine coolant.
Adding rad iator repair fluid may adverse­
l y affect the function and performance of
you r cooling system and could result in
damage not covered by your New Vehicle Limited Wa rra nty.
- Coolant pollutes the env ironment and
could cause an engine fire. Excess coo l­
ant w ill be forced ou t through the pres­
su re re lief va lve in the cap when the en­
gine becomes hot .
- If, in an emergency, only water can be
added, t he cor rect ratio between wate r
and an tifreeze<=> page 201 must be re ­
stored as soon as possib le .
Checkin g and fillin g 203
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@) For the sake of the environment
Drained coolant sho uld not be reused. A l­
ways d ispose of used coolant while observ­
i ng a ll environmental regulations.
Radiator fan
The radiator fan switches on automatically by
itself .
T he radiator fan is dr iven by the engine via the
V-belt. The viscous clutch regulates the speed
of the fan according to the temperature of the coolant.
An a uxiliary electric radiator fan* switches on
and off depending on coolant temperature
and othe r vehicle ope rat ing cond it ions.
After yo u switch the eng ine off, the aux iliary
f an can continue running for up to 10 m inutes
- even with the ignition off. It can even switch
on again later by itself<=>.&. , if
- t he temperatu re of the engine coo lant rises
due to the heat build -up from the engine in
the engine compa rtment, or
- the engine compa rtment heats up because
the vehicle is parked in intense sunlight.
A WARNING
=
- To reduce the risk of personal inju ry nev-
er touch the radiator fan.
- The a uxiliary electric fan is tempe rat ure
contro lled and can switch on suddenly
even when the engine is not running.
- The a uxiliary radiator fan switches on a u­
tomatically when the engine coo lant
reaches a certain temperature and will
continue to run until the coo lant temper­
ature drops.
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272 Index
Dimensions ....... ..... ... .. .. .... . 262
Dimming the rea rview mirror .. .. .. .... 55
Disp lays
Cleaning . ...... ..... ...... .. .. .. . 187
Doors emergency locking ..... ... .. .. .... .. 35
Driver information system Eng ine oi l temperature indicator .... .. 26
Open doo r or front lid warning . . . . . . . . 23
Outside temperature display . ....... . . 23
Sound system display . . . . . . . . . . . . . . . 23
Driver seat
refer to Seat ing pos ition . .. .. .. .. .. . 113
Driving safely . . . . . . . . . . . . . . . . . . . . . . 112
D riving through water . ... .. .. .. .. ... 179
Driving t ime . . . . . . . . . . . . . . . . . . . . . . . . 24
Dust filter
refer to Pollutant filter (automatic A/C
system) .. ... ............ .. .. .. .. .. 69
Dynamic stee ring . . . . . . . . . . . . . . 102, 175
E
Easy entry function ................... 62
El ectro -mechanical power assist .. .... . 17 5
Electromechanica l parking brake
Eme rgency braking . . . . . . . . . . . . . . . . . 79
Indicator ligh t . . . . . . . . . . . . . . . . . . . . . 78
Park ing .. ................. .. .... .. 79
Releasing and closing ...... .... ... .. 78
Starting ass ist ........ .... .... ... .. 79
Starting from rest ......... ... .. .... 79
War ning/ indicato r lights ... .. .. .. .. . . 16
Electronic different ial lock
Warn ing/ indicato r lights ... .. .. .. .. . . 18
Electronic differential lock (EDL) . . . . . . . 171
Warning/indicator lights ... .. .. .. .. . . 1 9
E lect ronic immobilize r . . . . . . . . . . . . 12, 36
Elec tronic power co ntrol
(EPC) warn ing/ indicator light ... .. .... 20
Electronic stabilization control Sport mode . . . . . . . . . . . . . . . . . . . . . . 173
E lectronic Stabilization Control ( ESC) ... 171
Warn ing/ indicator lights ... .. .. .... . . 18
Emergency actuation Doors ..... .......... ........... .. 35
I gnition key ....................... 33 E
mergency brak ing .... .. ..... .... . .. . 79
E mergency flasher . . . . . . . . . . . . . . . . . . . 53
Warning/ind icator lights ........ .... . 22
Emergency key . . . . . . . . . . . . . . . . . . . . . . 31
Starting engine .. .......... ...... .. 7S
Emergency operation Emergency brak ing f unction (parking
brake) .... .... .. ............. .... . 79
Luggage compartment lid ............ 37
Power top ..... .. ... .......... .. .. . 47
Emergency starting . ..... .... ... .. .. 255
Emergency towing ........... ....... 257
Energy management . ........... .. .. 177
Battery power . . . . . . . . . . . . . . . . . . . . . 16
Driver notification .................. 16
Engine Compartment .... ... .. ..... .... . .. 197
Coolant ... .. .. .. .. ........... .... 201
Data . .... .... .. ............. .... 263
Hood ...... ... ... ............... . 19S
Starting . . . . . . . . . . . . . . . . . . . . . . 73, 76
Starting with jumper cables ......... 255
Stopp ing . . . . . . . . . . . . . . . . . . . . . . 75, 7 7 Engine compartment
Safety instructions .......... .... ... 195
Working the eng ine compartment 195
Engine coolant Indicator light .... .............. .. . 17
E ngine coolant system ........... .. .. 201
Adding coolant ... .. .... .... ... .. .. 202
Checking coolant level .. ..... ... .. .. 202
Checking the engine coolant level ... .. 202
Radiator fan ... .. ............. .... 203
En gine coolant temperatu re
T emperature gauge .. .. ..... ... .. .. . 10
Engine hood Closing ......... .. .............. . 195
How to re lease the hood ........ .. .. 195
Engine oil .. .. .. .. ............. .. .. 197
Adding ..... .. .. .. ... ....... ... .. 199
Additives ........ ................. 199
Changi ng ..... ............ ....... 200
Check oil level . .. ... .......... .. .. 199
Consumption .. .. ............. .. .. 199
Indicator light . . . . . . . . . . . . . . . . . 17 , 21
Oil consumption .. ... .. ..... ... .. .. 198
Oil grades ..... .. ... .. ..... ... ... . 197

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Pressure malfunction ... ... .. .. .. .. .. 17
Sensor defective . . . . . . . . . . . . . . . . . . . . 21
Specif ication and viscos ity . ... .. .. .. . 197
temperature indicator . . . . . . . . . . . . . . . 26
E ng ine speed limitat io n ..... .. .. .. .. .. 20
Env ironment
Break- in pe riod .............. ... ... 179
Cata lytic converter ........ .. .. .. .. . 180
D isposing of yo ur vehicle ba tte ry .. .. . 208
D riving a t high speeds ..... .. .. .. .. . 182
D riving to m inimi ze pollution and no ise 18 1
Fu el . .... .. ... .. .. ..... ... .. .. ... 192
F ue l economy ..... .... ... .. .. .. ... 181
Leaks under your veh icle ... .. .. .. .. . 195
Lett ing the ve hicle stand and warm up . 182
Proper disposal of drained brake flu id . 204
Prope r disposal of dra ined engine coo l-
ant ...... ... ................ .... 202
Pr ope r disposal of dra ined engine
oil . . . . . . . . . . . . . . . . . . . . . . . . . 199, 200
Recy cling use d engine oil ... .. .. .. .. . 199
Un leaded f uel ... ...... ... .. .. .. ... 190
What should I do with an old battery? . 208
E PC
refer to Electronic powe r control . . . . . . 20
Event Data Recorder (EDR) . .. .. .. .. .. . 170
Ex haust tail pipes
C leaning ... .... .. .... ... .. .. .. ... 186
E xpansion ta nk ............ .. .. .. .. . 20 2
Exterior lighting . . . . . . . . . . . . . . . . . . . . . 51
E xterio r mirrors
Ad justing .. ... .. ..... ... .. .. .. .... 54
Dimm ing ... .. .. .. .... ... .. .. .... .. 55
Heating .. .. ............. .... .. .... 54
F
Fan
Radiator
F asten ing 203
B ooste r seats ............ .. .. .. .. . 160
Conve rtible c hild safety seats ... .. .. . 159
Infant seats 158
Fl at t ire
C hanging .. ............. .... .. ... 2 44
F loor mats . . . . . . . . . . . . . . . . . . . . . . . . . 117
F oglights(rea r) . ....... ... .. .. .. .. .. 51
F oldi ng the rear seats . . . . . . . . . . . . . . . . . 66
Inde x 273
Foot peda ls . . . . . . . . . . . . . . . . . . . . . . . . 117
Fo r th e sake of the environment
Gasoline fumes and t he env ironme nt .. 192
L etting the engine wa rm up . . . . . . 73, 76
Ref ueling . .. .. .. ................. 192
Saving f uel by early upsh ifting ... .. .. . 11
Fron t air bags
Desc ription .. .. .. ... .. .......... .. 135
H ow they wor k ....... ......... .... 140
Frontal coll is ions and the laws of p hysics 124
Front passenger's door emergency loc king 35
Front seats Adjus ting . . . . . . . . . . . . . . . . . . . . . . . . 114
Child rest rain ts in the fron t sea t .. .. .. 132
Up per cabin heati ng ... .. ...... ... .. . 72
Fuel Additives ........ .. ............... 190
Bl ended gaso line . ................. 190
Co nsu mp tion .. .. .... ......... .. .. . 24
F iller neck ... .. .. .. . .. ... .... ... .. 191
Fuel ga uge . . . . . . . . . . . . . . . . . . . . . . . . 12
Gasoline . ... .... ... .. .. ..... ... .. 190
Gasoline addit ives .. ........... .... 191
Low fue l level symbol .......... .. .. . 21
Octane rat ing .. .. ................. 190
Recommendation ........ ......... . 190
Ref uell ing ... .. .. .. . .. .... .... .. .. 192
Rese rve ...... ... .. ................ 12
T ank capa city .. .. .... ............. 262
T ank sys tem . .. .. ............. .... . 21
U nlocking the fuel fi lle r flap by hand 193
Fuel filler flap Unl ocking the fuel fi lle r flap by hand 193
Fuses Ass ignment . . . . . . . . . . . . . . . . . 250, 252
Replacing ... .. .. .. . .. .... .... .. .. 250
G
Garage door opener (Home link) ..... .. . 40
Gas d ischa rge lamps ............... .. 253
Gauges Engine coolant temperatu re . . . . . . . . . . 10
Fuel ga uge . . . . . . . . . . . . . . . . . . . . . . . . 12
T acho meter . .. .. ................. . 11
General illustration Instruments and controls ............. 8
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