2014 AUDI A5 COUPE radiator

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 specially conditioned water and the
manufacturer's glycol-based coolant addi-
tive G13 antifreeze with anticorrosion addi­ tives (50% for USA models; 60% for Canadian models). This mixture both assures the neces­
sary frost protection and protects metal com­
ponents in the engine's cooling system from
corrosion and scaling.
It also raises the boil­
ing 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.
If you must add coolant, use a mixture of wa­
ter and coolant additive. Mixing the coolant
additive with distilled water is recommended.
& WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS¢ .&.
in Working in the engine
compartment on page 206.
(D Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in
Checking and filling 213
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 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. 164 Eng ine compartment: Cover on the coolant
expansion tank
"' Before you check anything in the engine
compartment,
always read and heed all
WARNINGS ¢ .&, in Working in the engine
compartment on page 206.
"'Park your vehicle on a level surface .
.,. Turn off the ignition.
.,. Read the engine coolant level from the cool­
ant expansion tank ¢
fig. 164, ¢ page 208,
fig. 161.
With a cold engine, the coolant Iii>

214 Check ing and filling
level should be between the "MIN" and
"MAX" markings. When the engine is warm,
the leve l may be slightly above the "MAX"
marking .
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
c:> page 208.
To obtain an accurate reading, the engine must be switched
off.
The expansion tank in you r vehicle is equipped
with an e lectric coolant level sensor.
When the coolant level is too low, the warning light in the Auto-Check System
c:> page 17will
b link until you add coo lant and the level has
been restored to no rma l. Even though there is
an electric coolant level sensor, we still rec ­
ommend you check the coolant leve l from
time to time.
Coolant loss
Coolant loss may indicate a leak in t he cool ing
system. In the event of coolant loss, the cool ­
ing system should be inspected immediately
by your authorized A udi dealer.
It is not
enough merely to add coolant.
I n a
sea led system, losses can occur only if
the boiling point of the coolant is exceeded as
a result of overheat ing.
A WARNING
The cooling system is unde r pressure and
can get very hot. Reduce the risk of scald­
ing from hot coolant by following these
steps .
- Turn
off the engine and allow it to cool
dow n.
- 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 very carefully in
a counter-clockwise direction wh ile ap­
plying light, downward pressure on the
top of the cap .
- To avoid be ing burned, do not spill ant i­
freeze or coolant on the exhaust system
'
or hot engine parts. Under certa in cond i­
tions, the ethylene glycol in engine coo l­
ant can catch fire.
(D Note
Do not a dd any type of radiator leak sea l­
ant to your veh icle's engine coolant. Add ­
i ng radiator repa ir fl uid may adverse ly af­
fect the funct ion and performance of your
cooling system and could result in damage
not covered by your New Veh icle L imited
War ranty .
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:> A in Working in the engine compart­
ment on page 206 .
Requirement: There m ust be a res idual
amount of coo lant in the expans ion tank
c:> (]) .
.,.. Turn off the eng ine .
.,.. Let the engin e cool down.
.,.. Place a thick rag over the coo lant expansion
tank
c:> page 213 , fig. 164 and carefully turn
the cap counter-clockwise
c:> .&_ .
.,.. Add coo lant m ixed in the correct rat io
c:> page 213, Coolant up to the MAX ma rk­
ing.
.,.. Mak e s ure t hat the fl uid leve l remains sta-
b le. Add more coo lant if necessary.
.,.. Twist the cap on again
tightly .
Replacement engine coo lant must confo rm to
ex act spec ific at ions
c:> page 213, Coolant.
We recommend using only coolant add it ive
G12 ++, G13 or i n an emergency G 12+. Do
not
use a different add it ive. In an emergen cy use
plain wa ter until yo u can ge t the correct addi­
tive and can restore t he correct ratio. This
sho uld be done as soon as possib le .
If you have los t a cons iderab le amount o f
coolant, the n you sho uld add cold ant ifree ze
and co ld wate r on ly when the engine is cold.
Always use
n ew engine coo la nt w hen refilling . .,.

Do not fill coolant above the "MAX" mark. Ex­
cess coolant will be forced out through the pressure relief valve in the cap when the en­
gine becomes hot .
_& WARNING
-The cooling system is under pressure and
can get very hot. Reduce the risk of
scalding from hot coolant by following
these steps .
- Turn
off the engine and allow itto cool
down.
- Protect your face, hands and arms from escaping fluid and steam by covering
the cap with a large, thick rag.
- Turn the cap slowly and very carefully in a counter-clockwise direction while
applying light, downward pressure on
the top of the cap .
- To avoid being burned, do not spill an­
tifreeze or coolant on the exhaust sys­
tem or hot engine parts . Under certain
conditions, the ethylene glycol in en­
gine coolant can catch fire.
- Antifreeze is poisonous. Always store an­
tifreeze in its original container and well
out of the reach of children.
- 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 coolant if the expansion tank
is empty. Air could enter the cooling sys­
tem and damage the engine. If this is
the case, do not continue driving . Seek
professional assistance.
- Coolant pollutes the environment and
could cause an engine fire . Excess cool­
ant will be forced out through the pres­
sure relief valve in the cap when the en­
gine becomes hot.
- If, in an emergency, only water can be
added, the correct ratio between water
and antifreeze
¢ page 213 must be re­
stored as soon as possible.
Checking and filling 215
'
@) For the sake of the environment
Drained 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 driven by the engine via the
V-belt. The viscous clutch regulates the speed
of the fan according to the temperature of the coolant.
An auxiliary electric radiator fan* switches on
and
off depending on coolant temperature
and other vehicle operating conditions.
After you switch the engine
off, the auxiliary
fan can continue running for up to 10 minutes
- even with the ignition
off. It can even switch
on again later by itself ¢.&. , if
- the temperature of the engine coolant rises
du e to the h eat build-up from th e engin e in
the engine compartment, or
- the engine compartment 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
controlled and can switch on suddenly
even when the engine is not running.
- The auxiliary radiator fan switches on au­
tomatically when the engine coolant reaches a certain temperature and will
continue to run until the coolant temper­
ature drops. •
•

complexity of today's automobi les, have
steadi ly reduced the scope of maintenance
and repairs which can be carried out by vehicle
owners.
Also, safe ty and e nvir onm en tal con­
cerns place very strict limits on the nature of
repairs and adjustments to engine and trans­
miss io n pa rts which an owner can perform .
Maintenance, adjustments and repairs usua lly
require special tools, testing devices and oth­
er equipment avai lab le to specially trained
workshop personnel in order to assure prope r
performance, reliab ility and safety of the vehi­
cle and its many systems .
Improper ma intenance, adjustments and re ­
pa irs can impair the operation and reliability
of your vehicle and even void your vehicle war­ ranty. The refo re, p roof of servic ing in accord­
ance w ith the maintenance sched ule may be a
condition for upholding a poss ible war ranty
claim made within the warranty period.
Above all, operational safety can be adversely
affected, crea ting unnecessary risks for you
and your passengers.
If in doubt about any servicing, have it done
by your authorized Audi dealer or any properly
equ ipped and qua lified workshop. We st rong­
l y urge you to g ive your authorized Audi dea ler
the opportunity to perform all scheduled
maintenance and necessary repairs . Your dea l­
er has the facilities, original parts and trained
specialists to keep your veh icle running prop­
erly.
Performing limit ed m aintenance you rself
The following pages describe a limited num­
ber of procedures which can be performed on
your vehicle with ordinary too ls, should the
need arise and trained personnel be unavaila­
ble. Before performing any of these proce­
dures, always thoroughly read all of the appli ­
cable text and carefully follow the instruc­
tions given. Always rigorously obse rve the
WARNINGS provided.
B efore you check anything in th e engine
compartment, a lways re ad and heed all
Con sumer In formation 265
WARNINGS ¢ & and ¢ & in Working in the
engine comportment on page 206 .
A WARNING
-Ser ious personal injury may occur as a re­
sult of improperly performed mainte­
nance, adjustments or repa irs.
-Always be extremely careful when work­
ing on the vehicle. Always follow com­
mon ly accepted safety practices and gen­
eral common sense. Never r isk personal
lnJUry.
- Do not attempt any of the ma intenance,
checks or repairs descr ibed on the fol­
lowing pages if you are not fully fam iliar
wit h these or othe r pro cedures with re­
spect to t he veh icle, or are uncerta in how
to p roceed .
- Do not do any work without the proper
too ls and equipment. Have the necessary
work done by your authorized A udi deal ­
er or any properly equipped and qualified
wo rkshop.
- The engine compartment o f any motor
veh icle is a potentially hazardous area.
Never reach into the area around or
touch the radiator fan. It is temperature
contro lled and can switch on suddenly -
even when the engine is off and the igni­
tion key has been removed. The rad iator
fan switches on automat ica lly when the
coo lant reaches a certai n temperatu re
and will cont inue to run until the coo lan t
tempera ture drops .
- Always remove the ign itio n key befo re
anyone gets under the vehicle.
- Always support your veh icle with safety
s tands i f it is necessary to work under­
neath the vehicle. The jack s upplied with
the vehicle is not adequate for this pur­
pose and cou ld collapse causing serio us
personal injury.
- If you must work underneath the vehicle
with the wheels on the ground, a lways
make sure the vehicle is on leve l ground,
that the wheels are a lways securely
blocked a nd that the engine cannot be
started.
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Engine compartment
Safety instructions ................ . 206
Working the engine compartment 206
Engine coolant
Indicator light . . . . . . . . . . . . . . . . . . . . . 17
Engine coolant system .......... ... .. 213
Adding coolant .............. ... ... 214
Checking coolant level ..... .. .. .. .. . 213
Checking the engine coolant level . . . . . 213
Radiator fan ............. .. .. .. .. . 215
Engine coolant temperature Temperature gauge .......... .... ... 10
Engine hood Closing .. .. .. ........... .. .. .. ... 206
How to release the hood ... .. .. .. .. . 206
Engine oil ... ................ ... ... 208
Adding .... ................ ... ... 211
Additives . .. .. ........... .. .. .. ... 211
Changing .. ............. .... .. ... 212
Check oil level ........... .... .. ... 211
Consumption ............... ... ... 211
Indicator light . . . . . . . . . . . . . . . . . 17, 21
Oil consumption . ...... ... .. .. .. .. . 210
Oil grades ..................... ... 208
Pressure malfunction ...... .. .. .. .. .. 17
Sensor defective . . . . . . . . . . . . . . . . . . . . 21
Specification and viscosity ... ... .. .. . 208
Engine speed limitation .......... .... . 21
Environment Break-in period ........... .. .. .. ... 188
Catalytic converter ............ ... .. 189
Disposing of your vehicle battery ..... 220
Driving at high speeds .......... .... 190
Driving to minim ize pollution and noise 190
Fu el . .. .. .. .. .. ........... .. .. ... 204
Fu el economy ..................... 190
Leaks under your vehicle ............ 206
Letting the vehicle stand and warm up. 191
Proper disposal of drained brake fluid . 216
Proper disposal of drained engine cool-
ant . .... .. .. ............. .. .. ... 214
Proper disposal of drained engine
oil ...... ... ............. ... 211,212
Recycling used engine oil . .. .. .. .. .. . 211
Roof rack . . . . . . . . . . . . . . . . . . . . . . . . . 62
Unleaded fuel . ........... .. .. .. ... 201
What should I do with an old battery? . 220
Index 273
EPC
refer to Electronic power control . . . . . . 20
Ethyl alcohol (Fuel) . ................. 202
Event Data Recorder (EDR) ........ .... 180
Exhaust tail pipes Cleaning ... ..... .. ............... 197
Expansion tank .. .... ... ....... ..... 213
Exterior lighting . .. ................. . 43
Exterior m irrors
Adjusting ..... .... ................ 46
Dimming ... ..... .. ................ 47
Heating ........................... 46
F
Fan
Radiator
Fastening 215
Booster seats .. ...... ......... .... 169
Convertible child safety seats .... .... 168
Infant seats
Flat tire 167
Changi ng ... .. .. .. .. ........... .. 244
flexible fuel ... .. .... ............... 202
Floor mats ... ..... .. ............... 124
Fog lights/rear fog lig ht(s) . . . . . . . . . . . . . 43
Folding the rear seats ... ............. . 63
Foot pedals . .. .. .. .. ............... 124
For the sake of the environment Gasoline fumes and the environment .. 204
Letting the engine warm up . . . . . . 71, 74
Refueling . .. .. .. ................. 204
Saving fuel by early upsh ifting ... .. .. . 11
Front airbags Description . . . . . . . . . . . . . . . . . . . . . . . 141
How they work ... .. . .. .... ........ 146
Frontal collisions and the laws of physics 130
Front passenger's door emergency locking 37
Front seats Adjusting ....... .. ..... .......... 121
Child restraints in the front seat ...... 138
Fuel Additives .... .. ...... ............. 201
Blended gasoline ... . .. .... ........ 201
Consumption .. ... ............... .. 25
Filler neck . .. .. .... .......... ..... 203
Fuel gauge . . . . . . . . . . . . . . . . . . . . . . . . 12
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