2013 AUDI A5 CABRIOLET cooling

Engine cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro ­
te cts the engine from freezing in the winter .
The cooling system is sealed and generally re­
qu ires 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-based coolant additive G 13 antifreeze with
anticor ros ion add itives (50% for USA mode ls;
60% for Canadian mode ls). This mixtu re both
assures the ne cessa ry frost prote cti on and
p rotec ts metal components in the engine's
coo ling system from cor ros io n an d scaling. It
a lso raises the boiling point of the coolant.
D o not red uce the con cent ration o f th e coo l­
ant in the summe r by adding plain water .
The
proportion of coolant additive must be at least 50% but not more than 60%
to ma in­
tain antifreeze protection and cooling efficien­
cy. If the coolant frost protect ion is too low,
the coolant cou ld freeze and damage the veh i­
cle heating and eng ine cooling system .
For yea r-round driving, antifreeze is added at
the factory for temperatures down to:
- -3 1 °F (-35°C)USA
- -4 0 ° F ( - 40 °C) Canada.
A WARNING
Before yo u check any thing in the engine
compartment, always read and hee d all
W AR NIN GS
¢ .&. in Working in the engine
compartment on page 212.
(D Note
- Before win ter se ts in, have the coolan t
checked to see if t he coolant ad dit ive i n
your vehicle is suffic ient to meet the cli­
mate cond itions . T hi s is especially imp or­
tant if you live in a regi on whe re the w in­
te r is e xtremely cold. If necessary, in -
Checking and fillin g 219
crease the propo rtion of coo lant add itive
to 60%.
- When adding coolant additive to yo ur
coolin g system , remembe r:
- We reco mmend us ing o nly coola nt ad­
d itive G12++ or G13 for your vehicle .
This coolan t ad ditive is availab le at a u­
thor ized Audi dealers. O ther types of
ant ifree ze can s ignific antly red uce cor­
rosion pro tec tion . The result ing corro­
sion can ca use a loss o f coolan t and se ­
rio us en gine damage.
- D o not add any ty pe of rad iator leak seal­
ant to yo ur vehicle 's engine coolan t.
Adding radiator repair fl uid may adverse ­
ly affect the function and performance of
your cooling system and co uld resu lt in
damage not covered by you r New Ve hicle
Limited War ran ty.
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance.
Fig . 1 78 Eng in e co mpa rtm ent : Cover o n the coo la nt
expans io n t an k
-... ;;; ,; a, m
.. Before yo u check anything in the engine
compartment,
always read and heed all
WARNINGS ¢ & in Working in the engine
compartment on page 212 .
"' Park yo ur vehicle on a lev el su rface .
"' Turn off the ignition .
"' Read t he e ngine coolant level from the
coo lant expan sio n ta nk ¢
fig. 178 ,
¢ fig. 175. With a cold engine, the coolant
level sho uld be between the "MIN " and
"MAX" markings . When the engine is warm,
the level may be slightly above the "MAX"
marking.
Iii>

220 Check ing and filling
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration ¢
page 214 .
To obtain an accurate read ing, the eng ine
must be switched off .
The expans io n tank in you r vehicle is equipped
with an e lectr ic cool ant level sensor.
When the coolant level is too low, the warning light in the A uto-Check System ¢
page 18 will
b link until you add coo lant and the level has
been restored to no rm al. Even though the re is
an e lec tric coolant level sensor, we s till rec ­
ommend you check the coolant leve l from
time to time.
Coolant loss
Coolant loss may indicate a leak in the cooling
system. In the event of coolan t loss, the cool ­
i ng system should be inspected immedia tely
by your authorized A udi dealer. It is not
enough merely to add coolant.
I n a
s e aled system, losses can occur only if
the boiling poin t of the coolant is excee ded as
a result of overheating.
A WARNING
The cooling system is unde r pressure and
can get ve ry hot. Reduce the risk of sca ld­
ing from hot coolant by following these
steps.
- Turn off the engine and allow it to cool
down.
- Protect yo ur face, hands and arms from
escaping fluid and steam by covering the
cap with a large, thick rag.
- Turn the cap slowly and ve ry carefu lly in
a counter-clockwise direction wh ile ap­
plying light, downward pressure on the
top of the cap .
- To avoid being b urned, do not spill ant i­
freeze or coolant on t he exhaust system
or hot eng ine parts. Unde r certain condi­
tions, t he ethy lene g lycol in engine cool­
an t can ca tch fire.
(D Note
Do not ad d any type of radiator leak sea l­
ant to your veh icle's engine coo lant. Add­
i ng radiator repa ir fluid may adverse ly af­
fect the funct ion and performance of your
cooling system and could result in damage not cove red by your New Veh icle L imited
War ran ty .
Adding coolant
Be very careful when adding engine coolant.
Before you check anyth ing in the eng ine com­
partment,
always read and heed all WARN­
INGS c> &. in Working in the engine compart ­
ment on page 212.
.. Turn off the engine.
.. Let the engine cool down.
.. Place a thick rag over the coolant expansion
tank ¢
fig. 178 and carefully turn the cap
co unter-clo ckwise ¢,&. .
.,. Add coo lant.
.. Twis t the cap on aga in
t ightly.
Replacement engine coo lant must confo rm to
exact spec ificat ions
¢ page 219, Coolant. We
re commend using on ly coo la nt additive G 12+
+ , G 13 or in an eme rgen cy G12+. Do
not use a
different additive. In an emergency use plain
water until yo u can get the correct additive
and can restore the correct ratio . This shou ld
be done as soon as possible .
If you have los t a cons iderab le amount o f
coolant , then you sho uld ad d cold antifreeze
and cold wate r on ly w hen the engine is cold.
Always use
new engine coo lant when refilling.
Do not f ill coo lant abov e the "MAX" mark . Ex­
cess coo la nt w ill be fo rced o ut thro ugh the
pressure relief valve in t he cap w hen the en­
gine becomes hot.
A WARNING
-= -
-The cooling system is under pressure and
can get very hot. Reduce the risk of ..,.

276 Index
Changing a wheel
Changing engine oil
Chassis 249
218
Undercoating .............. .. .... . 201
Checking Eng ine coolant leve l ...... ... .. .... . 219
Checking tire pressure ....... ..... .. . 233
Child restraints Danger of using child restraints in the
front seat . . . . . . . . . . . . . . . . . . . . . . . . 141
Where can I get add itional information
about child restraints and their use? . . 178
Child restraint system anchors ... .. .. . 175
Ch ild safety .. ............. .. .. .. .. . 161
Convertible locking retractor . ..... ... 17 1
Important safety instructions for using
child safety seats ................. . 164
Important things to know when driving
with children .............. .. .... . 161
Installing a child restraint using the
L ATCH system ......... .... ... .. .. . 177
Lower anchorages ............ .. ... 176
Mounting and releasing the anchorage
hook .. .... ... .......... .. .. .. .. . 177
Ch ild safety seats . ..... .... .. .. .... . 167
Booster seats ............. ... .. ... 169
Convertible ch ild seats . . . . . . . . . . . . . 168
Conve rtible locking retractor .. .. .. .. . 171
Danger of using child restra ints in the
front seat .... ............. ...... . 141
How do I properly install a child safety
seat in my vehicle? ................. 164
Infant seats .............. ... .. .. . 167
Installing . . . . . . . . . . . . . . . . . . . . . . . . 171
LATCH system ............ .. .. .. .. . 177
Safety instructions .. ...... .. .. .. .. . 164
Unused safety belts on the rear seat .. 166
Cigarette lighter . . . . . . . . . . . . . . . . . . . . . 66
C leaning
A lcantara® (synthe tic suede) .. .. .. .. . 204
E ngine compartment ............ .. . 205
Exhaust tail pipes ........... .. .... . 201
Fabrics and fabric coverings . ..... .. . 202
Instrument panel ........... .. .... . 202
Interior .. ............... .. .. .... . 201
Leather .... .......... ...... ... .. . 204
Matte finish pa int ......... ... .. ... 197
MMI disp lay/controls .. .... .. .. .. .. . 201 Plastic
and vinyl . . . . . . . . . . . . . . . . . . . 199
Plastic parts ..... ................ . 202
Safety be lts ... .. ................ . 205
Trim strips .... .. ............. .... 199
Cleaning and protection .......... .... 194
Climate controls ... ..... ........... .. 70
Climate control system Automatic recircu lation ......... .... . 73
Supplementary heater ........ .. .. .. . 73
synchroni zing . . . . . . . . . . . . . . . . . . . . . . 73
Clock ..... ..... .. .. .............. .. 12
Closing Power windows .. ............. .. .. . 39
Closing/opening at the lock cylinder ................ .. 36
by remote control . . . . . . . . . . . . . . . . . . 34
with the centra l locking switch ........ 35
with the conven ience key ........ .... . 35
Cold tire inflation pressure ........ .... 231
Coming home . . . . . . . . . . . . . . . . . . . . . . . 53
Compact spare tire . ................ . 248
also refer to Spare tire . ...... ... .. .. 248
Compass in the mirror ........... .... . 59
Compliance ... .. .. .. .............. . 272
Consumer Information . . . . . . . . . . 129, 269
Contacting NHTSA ................. . 129
Convenience key
Indicator lights .. ... .......... .. .. . 79
Starting engine (S TART ENGINE STOP
button) ....... .. .. .............. .. 78
Stopping the engine (START ENGINE
STOP button) . . . . . . . . . . . . . . . . . . . . . . 79
Switching on ignition ........... .... . 78
unlocking/locking ... ... .... ... .. .. . 35
Convenience opening/closing ....... .. . 40
Convertib le child safety seats ......... 168
Convertible locking retractor Activating ..... .. ............. .... 173
Deactivating . .. .. ..... ........... . 173
Using to secure a child safety seat 1.71, 173
Coolant system . ... ................ . 219
Cooling mode (automat ic climate control) 71
Cooling System Expansion tank . .. ................ . 219
Cornering light . . . . . . . . . . . . . . . . . . . . . . 52