2013 AUDI RS5 CABRIOLET cooling

214 Checking and filling
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 .
The cooling system has been filled at the fac­ tory with a permanent coolant which does not need to be changed. The coolant consists of a
mixture of water and the manufacturer's gly ­
col-basedcoolant additive G13 antifreeze with
anticorrosion add itives (50% for USA models;
60% for Canadian models). This mixtu re both
assures the necessary frost protection and
protects 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 cool­
ant in the summer by adding plain water .
The
proportion of coolant additive must be at
least 50% but not more than 60%
to main­
tain antifreeze protection and cooling efficien­
cy. If the coolant frost protection is too low,
the coolant could freeze and damage the vehi­
cle heating and eng ine cooling system .
For year-round driving, antifreeze is added at
the factory for temperatures down to:
- -31 ° F ( - 3 S °C) USA
- -40 °F ( - 40 °C) Canada .
_&. WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS ~
A in Working in the engine
compartment on page 207.
(D Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in
your vehicle is sufficient to meet the cli­
mate conditions . This is especially impor­
tant if you live in a region where the win­
ter is extremely cold. If necessary, in- crease the
proportion of coolant additive
to 60%.
- When adding coolant additive to your
cooling system, remember:
- We recommend using on ly coolant ad­
ditive G12++ or G13 for your vehicle.
This coolant additive is availab le at au­
thor ized Audi dealers. Other types of
antifreeze can significantly reduce cor­
rosion protection. The resulting corro­
sion cah 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 engine coolant .
Adding radiator repair fluid may adverse­
ly affect the function and performance of
your cooling system and could result in
damage not covered by your New Veh icle
Limited Warranty.
· Checking the engine coolant level and
adding coolant
Be very careful when adding engine coolant.
Fig. 180 E n g in e compart men t: Cover on the coo la nt
expansio n tan k
Fig. 181 En g in e compart men t: markings in the coo la n t
expansion tank
ll>

Before you check anything in the engine com­
partment,
al ways r ead and heed all W ARN­
ING S ¢ A in Working in the engine compart­
ment on page 207.
The "MIN" und "MAX" markings are found on
the bi-level disc in the interior of the coolant
expansion tank
¢ fig . 181.
.,. Park your vehi cle on a level sur face.
.,. Turn off the ignition .
.,. Let the engine coo l down .
.,. Place a thick rag over the coolant expansion
tank and
c a refully turn the cap counter ­
clockwise ¢
.&,.
.,. Read the engin e coolant le vel inside the
coolant expans ion tank ¢
fig. 180,
¢ page 209, fig . 177. With a cold engine,
the coolant leve l should be between the
" M IN" and "MAX" mark ings
¢ fig. 181
-arrows- . When the eng ine is warm, the lev­
el may be slightly above the "MAX" marking.
.,. The MAX marking may be covered with a
maximum of 1 mm of coolant when yo u
fill
coolant .
.,. Twist the cap on again tightly.
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
¢ page 209.
To obtain an accurate read ing, the engine
must be switched off .
The expans ion tank in you r vehicle is equipped
with an electric coolant level sensor .
When the coo lant level is too low, the warning
light in the A uto-Check System¢
page 18 wi ll
b lin k until you add coo lant and the level has
been restored to norma l. Even though there is
an electric coolant level sensor, we sti ll rec­
ommend you check the coolant leve l from
time to time.
Coolant loss
Coolant loss may indicate a leak in the coo ling
system . In the event of coolant loss, the cool ­
i n g system should be inspected immediately
by your authorized Audi dealer. It is not
enough merely to add coolant.
Checkin g and fillin g 215
In a sealed system, losses can occur on ly if
the boiling point of the coolant is exceeded as
a resu lt of overheating.
Adding coolant
Rep lacement engine coolant must confo rm to
exact specificat ions¢
page 214, Coolant .
We recommend using only coo lant add itive
Gl2++, Gl3 or i n an emergency Gl 2+ . Do not
use a different add itive. In an emergen cy use
plain water until you can ge t the correct addi­
tive and can restore the correct ra tio. This
sho uld be done as soon as possib le .
If you have lost a cons iderab le amount o f
coolant, then you sho uld add cold ant ifreeze
and co ld water on ly when the engine is cold.
A lways use
new engine coo la nt when refilling.
Do not fill coolant above the "MAX" mark. Ex­
cess coolant will be fo rced out through the
pressure relief valve in the cap when the en­
gine becomes hot.
_& WARNING
- Th e cooling system is un der pressure and
can get very hot. Reduce the risk of
scalding from hot coolant by following
these ste ps.
- Turn off the engine and allow it to coo l
down.
- Protect your face, hands and arms from
escaping fluid and steam by covering
the cap w ith a large, th ic k rag.
- Turn the cap s lowly and very carefully
i n a counter-clockwise direction while
applying light, downward pressure on
the top of the cap.
- To avoid being bu rned, do not spill an­
tifree ze or coolant o n the ex haust sys­
tem o r hot engine p arts. Under ce rtain
con ditio ns, the ethy lene glycol in en­
gine coolant can catch fire.
- Antifreeze i s poisonous. Always s tore an­
tifreeze in its original container an d well
out of the reach of children .
Ill-
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216 Check ing and filling
-If you drain the coolant, it must be
caught and safely stored in a proper con­
tainer clearly marked "poison".
(D Note
-Do not add any type of radiator leak seal­
ant to your vehicle's engine coo lant.
Adding rad iator repair fluid may adverse­
ly affect the function and performance of
your cooling system and could result in
damage not covered by your New Vehicle Limited Warranty .
- Coolant pollutes the environment and
could cause an engine fire . Excess cool­
ant wil l be forced out through the pres­
s u re re lief valve in the cap when the en­
gine becomes hot.
- If, in an emergency , only water can be
added, the correct ratio between wate r
and antifreeze
c::> page 214 must be re ­
stored as soon as possib le .
@ For the sake of the environment
Dra ined coolant should not be reused. Al­
ways dispose of used coolant while observ­ ing all environmental regulations.
Radiator fan
The radiator fan switches on automatically by
itself.
The radiator fan is dr iven by the engine via the
V-be lt . T he viscous clutch regulates the speed
of the fan accord ing to the temperature o f the
coolant .
A n auxiliary e lectr ic radiator fan* switches on
and off depending on coolant temperature
and other vehi cle operating conditions.
After you switch the engine off, the auxiliary
fan can cont inue runn ing for up to 10 minutes
- even with the ignition off.
It can even sw itch
on again later by itself
c::> .&. , if
- the temperature of the engine coolant rises
due to the heat bu ild-up from the eng ine in
the engine compartment, or -
the engine compa rtment heats up because
the vehicle is parked in intense sunlight.
.&_ WARNING .........
- To reduce the risk of personal injury nev­
er touch the radiator fan.
- The auxiliary electric fan is temperature
contro lled and can switch on suddenly
even when the engine is not running.
- The auxiliary radiator fan sw itches on au­
tomatically when the engine coo lant
reaches a certain temperature and will
continue to run until the coolant temper ­
ature drops .
Brake fluid
Checking brake fluid level
The brake fluid level can be checked with a
quick glance.
Fig . 182 Engin e compart men t: Cove r on the b rake flu­
id reservoi r
Before you check anyth ing in the engine com­
partment,
a lwa ys re ad and hee d all WARN­
ING S c::> .&. in Working in the engine compart­
ment on page
207.
~ Read the brake fluid level from the brake
fluid reservoir
c::> fig. 182, c::> page 209,
fig . 177. The brake fluid level must be be­
tween the "MIN" and "MAX" markings .
The brake fluid reservoir is located at the rear
partition of the engine compartment on the
left s ide
c::> page 209.
The fluid level may drop
slightly after some
t ime due to the automatic adjustment of the
brake pads. This is not cause for a larm . .,._

Child restraints
Dang er of using chi ld rest raints in th e
front seat . . . . . . . . . . . . . . . . . . . . . . . . 138
Where can I get addit ional information
about child restra ints and their use? . . 175
Ch ild restra int system anchors ... .. .. . 172
Ch ild safety .. ................ ... ... 158
Convertible locking retractor .. .. .. .. . 168
I mportant safety instr uctions fo r using
ch ild safety seats ......... .. .. .. .. . 16 1
I mportant things to know when dr iv ing
with chi ld ren .... ..... ... .. .. .. ... 158
Instal ling a chi ld restraint using the
LATCH system ............ .... .. .. . 174
Lower anchorages ........ .. .. .. .. . 173
Mounti ng and releasing the anchorage
hook .. .. ... ............. ...... .. 174
Ch ild safety seats ... .... ... .. .. .. ... 164
Booster seats ............ .... .. ... 166
Convertible c hild seats .... .. .. .. .. . 165
Convertible locking retracto r . . . . . . . . . 168
Danger of us ing ch ild restra ints in the
fro nt seat ............ ...... .... .. 138
H ow do I proper ly install a child safety
se at in my vehicle? ........ .. .. .. .. . 16 1
I nfant sea ts ............. .. .. .. .. . 164
I ns tal ling .. .... .. .... ... .. .. .. ... 168
L A TCH system .. .. ..... ... .. .. .. ... 17 4
Safety inst ructions ..... ... .. .. .... . 16 1
Unused safety belts on the rear seat . . 163
C igare tte lig hte r . . . . . . . . . . . . . . . . . . . . . 6 6
C lea ning
A lcantara ® (synth etic suede) .. .. .. .. . 199
E ng ine compartment ...... .. .. .. .. . 200
E xha ust tail p ipes ......... .. .. .. .. . 196
Fab rics and fabr ic coveri ngs .. .. .. .. . 19 7
I ns trumen t panel . ..... ... .. .. .. .. . 19 7
I nterior .... .. .... .... ... .. .. .. ... 196
L eather .... .... .. .... ... .. .. .. ... 199
Matte fin ish pa int ........ .. .. .. .. . 192
MMI disp lay/controls ...... .. .. .. .. . 196
Plastic and v inyl . .......... ... ... .. 194
P lastic pa rts . . . . . . . . . . . . . . . . . . . . . . 197
Safety belts ..... .. ...... .. .. .. .. . 200
Trim str ips . .. ........... .. .. .. ... 194
Cleaning and protection ..... .. .. .. .. . 189
Climate con trols . . . . . . . . . . . . . . . . . . . . . 69
Inde x 271
Climate control system
Automatic recirc ulation . ..... ... .. .. . 72
synchronizing . . . . . . . . . . . . . . . . . . . . . . 72
Clock .... .. .. .. .. .... ........... .. . 12
Clos ing
Power w indows .. .. ... ....... .... .. 39
Closi ng/ope ning
at the lock cylinder . . . . . . . . . . . . . . . . . . 36
by remote control . . . . . . . . . . . . . . . . . . 34
with t he centra l locking sw itch ... .. .. . 35
with the conven ience key ........... .. 35
Cold tire inflation press ure ..... ... .. .. 226
Coming home . . . . . . . . . . . . . . . . . . . . . . . 53
Compass in the m irror ............... . 59
C ompliance ... .... .. . .. .. ..... ... .. 267
Consumer Information . . . . . . . . . . 126, 264
Contacting NHTSA . ................. 126
Co nvenience key
Ind icator lights . ... .. .. .... ... .. .. . 78
Starting engine (S TA RT E NGIN E STOP
button) ... .. .. .... . ... ...... ... .. . 77
Stopping the eng ine (START ENGINE
STOP button) . . . . . . . . . . . . . . . . . . . . . . 78
Switching on ignit ion ............... .
77
unlocking/locking .. .............. .. 35
Convenience opening/closing
Conve rtib le child safety seats
Convertib le loc king retractor ..
... .. .. . 40
165
Activati ng . . . . . . . . . . . . . . . . . . . . . . . . 170
Deact ivati ng .. ... .. ..... .......... 170
U sing to secu re a child safety seat 1.68, 170
Coolant system . . . . . . . . . . . . . . . . . . . . . 214
Cooling m ode (automat ic cl im ate control) 70
Cooling System Expansion tank ... .. . .. .... .... .. .. 214
Cornering light . . . . . . . . . . . . . . . . . . . . . . 52
Cr uise cont ro l
Changi ng speed .. ................. . 83
P resett ing your speed ... .... ... .. .. . 83
Switching off . ..... . .. .. ..... ... .. . 83
Switch ing on ... .. .. .. .. .. .... ... .. . 82
C ruisi ng range . . . . . . . . . . . . . . . . . . . . . . . 25
(upholder .. .. .. .. .. . .. .. ..... ... .. . 66
D
Data ....... .. .. .. ................. 263
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