2013 AUDI A5 COUPE cooling

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-based coolant additive G13 antifreeze with
anticorrosion additives (50% for USA models;
60% for Canadian models). This mixture 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 engine cooling system .
For year-round driving, antifreeze is added at
the factory for temperatures down to:
- -31°F(-35 °C)USA
- -40 °F ( - 40 °C) Canada.
A WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS
¢ .&. in Working in the engine
compartment on page 216.
(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-
Checking and filling 223
crease the proportion of coolant additive
to 60%.
- When adding coolant additive to your
cooling system, remember:
- We recommend using only coolant ad­
ditive G12++ or G13 for your vehicle .
This coolant additive is available at au­
thorized 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 radiator 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 Vehicle
Limited Warranty.
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance.
Fig. 172 Engine compar tment: Cover on the coola nt
expansio n tank
-... ;;; ,; a, m
.. Before you check anything in the engine
compartment,
always read and heed all
WARNINGS ¢ & in Working in the engine
compartment on page 216.
"' Park your vehicle on a level surface .
"' Turn off the ignition .
"' Read the engine coolant level from the
coolant expansion tank¢
fig. 172 ,
¢ page 218, fig. 169 .
With a cold engine,
the coolant level should be between the
"MIN" and "MAX" markings . When the en­
gine is warm, the level may be slightly above
the "MAX" marking.
Iii>

224 Check ing and filling
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
¢ page 218.
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 w ill
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
partmen t,
always read and heed all WARN­
INGS ¢ &. in Working in the engine compart ­
ment on page 216.
.. Turn off the engine.
.. Let the engine cool down.
.. Place a thick rag over the coolant expansion
tank ¢
page 223, fig. 172 and carefully turn
the cap counter-clockwise ¢
,&..
.,. Add coo lant.
.. Twist the cap on aga in
t ightly.
Replacement engine coo lant must confo rm to
exact spec ificat ions ¢
page 223, Coolant. We
recommend using on ly coo la nt add itive G 12+
+ , G 13 or in an eme rgency 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 sho uld
be done as soon as possible .
If you have los t a considerab le amount o f
coolant , then you sho uld add cold antifreeze
and cold wate r on ly w hen the engine is cold.
Always use
new engine coo lan t when refilling.
Do not f ill coo lant abov e the
"MAX" ma rk . Ex­
cess coo la nt w ill be fo rced o ut through the
pressure relief 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 ..,.

28 0 Index
Changing engine o il
Chass is 222
Unde rcoat ing . ........... .... .... . 205
Checking
Eng ine coolant leve l .... ... .. .. .. .. .
223
Checking tire pressure . ... .. .. .. .. .. . 237
Ch ild restra ints
Da nger of us ing ch ild restra ints in the
front seat . . . . . . . . . . . . . . . . . . . . . . . .
143
Where can I get additional information
about child restraints and their use? ..
184
Ch ild restra int system anchors . .. .. .. . 180
Ch ild safety .. .. . .......... .. .. .... . 166
Convertible locking retractor . . . . . . . . . 176
Important safety instructions for us ing
ch ild safety seats .. ..... .. .. .. .. .. .
169
Important th ings to know when dr iving
with ch ildren . ............. .. .... .
166
Ins tall ing a chi ld restraint using the
L A T C H system .. ... .... ... .. .. .... .
181
Lower anchorages ..... ... .. .. .... . 181
Mounti ng and releasing the ancho rage
hook .. .. .. ............. .. .. .. ...
181
Tether anchors . . . . . . . . . . . . . . . . . . . . 182
Tether straps . . . . . . . . . . . . . . . . . . . . . 182
Chil d safety seats .. ..... ... .. .. .... . 172
Booste r seats .. .. ..... ... .. .. .... . 174
Convertible child seats .... .. .. .... . 173
Convertible locking retractor .. .. ..... 176
Danger of us ing ch ild restra ints in the
front seat . . . . . . . . . . . . . . . . . . . . . . . .
143
H ow do I properly install a child safety
seat in my vehicle? ............ .. ...
169
Infant seats ............. .. .. .. .. . 172
Ins tall ing .. ... .......... .. .. .. .. . 176
LA T CH system .. .. ..... ... .. .. .... . 181
Safety instructions ..... ... .. .. .... . 169
Unused safety belts on the rear seat . . 17 1
Cigare tte lig hte r . . . . . . . . . . . . . . . . . . . . . 59
C leaning
A lcantara ® (synthetic suede) .. .. .. .. .
209
Eng ine compartment .......... .. ... 209
Exhaust tail p ipes ...... .... ... .. .. . 205
Fab rics and fabr ic coverings .. .. ..... 206
Instrument panel ....... .. .. .. .. .. . 207
In ter ior .. ... ............ .. .. .. .. . 206
Leather ..... .. .. ..... ... .. .. .... . 208
MMI disp lay/controls . ... .. .. .... .. . 206
Plastic and vinyl . .... .. ..... .... . .. 203
Plastic parts ..... .. ... ..... ... .. .. 207
Safety be lts ... .. ... .. ..... ... .. .. 209
Tr im strips .... .. ............. .... 203
Cleaning and p rotection .......... .... 2 00
Cl imate controls ... ..... ........... .. 67
Climate control system
Automatic recircu lation ......... .... .
70
synchroni zing .. .. ............. .. .. . 70
Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Closing
Panoramic t ilting sunroof ........ ... .
41
Power w indows ... ............ .. .. . 40
Su n blind ..... .. .. ........... .... . 41
Closing/opening
at the lock cylinder . . . . . . . . . . . . . . . . . . 3 7
by remote control ..................
35
with the centra l locki ng switch ... .... . 36
with the conven ien ce key ........ .. .. . 36
Co ld tire inflation pressure . ........... 235
Coming home ..... ... .. ..... ... .. .. . 44
Compact spare tire . .. .. ...... ... .. .. 252
also refer to Spare ti re .......... .... 252
Compartments . . . . . . . . . . . . . . . . . . . . . . 60
Compass in the mirror . .. ..... ... .. .. .
51
Compliance . ...... .. .............. . 276
Consumer Information . . . . . . . . . . 132, 273
Contacting NHTSA . ... .......... .. .. 132
Convenience key
Indicator lights .. ... .. .. ... ..... .. .
75
Start ing engine (S TART E NGIN E STOP
button) ... .... ................... .
74
Stopping the eng ine (START ENG IN E
STOP b utton) .... .. .... .... ... .. .. .
75
Switching on ignition . .. ..... .... . .. . 74
unlocking/locking . .... ..... ... .. .. . 36
Co nvenience openi ng/clos ing ... .. .... . 40
Convertib le child safety seats ..... .... 173
Convertib le locking retractor
Activating ..... .. .. ... ..... ... .. ..
178
Deact ivat ing ... .. .. .... .... ... .. .. 178
Using to secure a child safety seat l.76, 178
Coolant system .. .. ... .......... .. .. 223
Cooling mode (automat ic cl imate co ntrol) 68
Cooling System
Expansion tank . .. ............. .. ..
223