2013 AUDI S4 radiator

220 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); put manual
transmission in Neutral.
- 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
~ /1. .
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.
(D 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.

226 Check ing 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 G 13 antifreeze with
anticorrosion add itives (SO% for USA mode ls;
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
a lso raises the boiling point of the coolant .
Do not reduce the concentration of the coo l­
ant in the summer by adding plain water .
The
p ro po rti on of c ool ant add it iv e mu st b e at
lea st 50 % but not mo re th an 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, antifreeze is added at
the factory for temperatures down to:
- -31° F(-3S°C)USA
- - 40 ° F ( - 40 °C) Canada.
_& WARNING
Before yo u check anything in the engine
compartment, always read and heed all
WARNINGS
¢ &. in Working in the engine
compartment on page 219.
(]) Note
-
- Before winter sets in, have the coolant
checked to see if the coo lant additive in
your vehicle is s uffic ient to meet the cli­
mate cond it ions . Th is is especially impor­
tant if you live in a region where the w in­
ter is extremely cold . If necessary, in- crease the p
roportion of coo lant additive
to 60%.
- When adding coolant additive to your
cooling system, remember:
- We recommend us ing on ly coolant ad­
d itive G12++ or G13 for your veh icle .
This coolant additive is availab le at au­
thor ized Audi dealers. Other types of
ant ifreeze can s ignificantly reduce cor­
rosion pro tection. The resulting cor ro­
sion can cause a loss o f coolant and se ­
rious engine damage.
- Do not add any type of rad iator leak seal­
ant to yo ur vehicle's engine coolant .
Adding radiator repair fl uid may adverse ­
ly affect the function and performance of
your cooling system and cou ld resu lt in
damage not covered by your New Veh icle
Limited Warranty.
' Checking the engine coolant level
The engine coolant level can be checked with
a quick glance.
F ig. 187 En gin e compa rtm en t: Cover o n the coo la n t
expans io n ta nk
-"' -"' >< .,
"'
.. Before yo u check anything in the engine
compartment,
alwa ys read and heed all
W ARNINGS ¢ .&. in Working in the engine
compartment on page 219 .
.,. Park your vehicle o n a level surface .
.,. Tu rn off the ignition .
.. Read t he engine coolant level from the
coo la nt expansion tank ¢
fig. 187 ,
r=:> page 221, fig . 184 . With a cold engine,
the coolant leve l should be between the
"MIN" and "MAX" markings . When the en­
gine is warm, the level may be slightly above
the "MAX" marking.
IJII,

The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
q page 221 .
To obtain an accurate read ing , the eng ine
must be switched off .
The expa nsion tank in you r vehicle is equipped
with an elec tric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System
q page 18 wi ll
b lin k until you add coo lant and the level has
been restored to norma l. Even t hough 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 indi cate a leak in the coo ling
sys tem. In the event of coolant loss, the cool­
ing system should be inspected immedia tely
by your authorized A udi dealer. It is not
enough merely to add coolant.
I n a
s ealed system, losses can occur only if
the boiling point of the coolant is exceeded as
a result of overheating.
A WARNING
The cooling system is unde r press ure 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 coo l
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 very carefu lly in
a counter-clockwise direction wh ile ap­
plying light, downward pressure on the
t op of the cap .
- To avoid being bu rned, do not spill ant i­
freeze or coo lant on the exhaust system
o r hot eng ine parts . Unde r certai n condi­
t ions, the ethy lene g lycol in engine cool­
an t ca n catc h fire.
Checkin g and fillin g 22 7
@ Note
Do not ad d any type of radiator leak sea l­
ant to your ve hicle's engine coolant. Add ­
i ng radiator repa ir flui d 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 Vehicle l imi ted
Warranty .
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 q & in Working in the engine compart ­
ment on page 219 .
.,. Turn off the engine.
.,. let the engi ne cool down.
.,. Place a thick rag over the coolant expansion
tank
q page 226, fig . 187 and carefully turn
the cap counter-clockwise
~ &_ .
.,. Add coo la nt.
.,. Twist the cap o n aga in
tightly.
Rep lacement engine coo lant must confo rm to
exact specificat ions ~
page 226, Coolant. We
recommend using on ly coo lant additive G 12+
+ , G 13 or in an eme rgency G12+. Do
not use a
different additive. In an emergency use pla in
water until you 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 cons iderab le amount o f
coolant , then you sho uld add cold antifreeze
and co ld water on ly when the engine is cold.
A lw ays use
new engine coo lant w hen refilling.
Do not f ill coo lant above t he "MAX" mark. Ex­
cess coola nt w ill be fo rced o ut through t he
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 ..,.
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228 Check ing and filling
scalding from hot coolant by following
these steps .
- Turn off the eng ine and allow it to cool
down.
- Protect your face, hands and arms from escaping flu id and steam by cover ing
the cap with a large, thick rag .
- Turn the cap slowly and very carefully
i n a counter-clockwise direction while
apply ing l ight, downwa rd press ure on
the top of the cap .
- To avo id being burned, do not spi ll an­
tifreeze or coolant on the exhaust sys­
tem or hot engine parts . Under certain
conditions, the ethylene glyco l in en­
gine coolant can catch f ire .
- Antifreeze is poisonous . Always store an­
tifreeze 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".
@ Note
- Coolant po llutes the env ironment and
could cause an engine fire . Excess coo l­
ant will be forced out through the pres­
sure 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 water
and antifreeze
c::> page 226 must be re­
stored as soon as possible .
@ For the sake of the environment
Drained coolant should not be re used. Al­
ways dispose of used coolant while observ­
ing all environmental regulat ions .
Radiator fan
The radiator fan switches on automatically by
itself
T he radiator fan is driven by the engine via the
V-be lt . The viscous clutch regulates the speed
of the fan accord ing to the temperature of the
coolant. An a
uxiliary electric radiator fan* switches on
and off depend ing on coolant temperature
and other vehicle operat ing condit ions .
After yo u sw itch the engine off, the aux iliary
f an can continue running for up to 10 minutes
- eve n wit h the ignit ion off. It can even switc h
on again later by itself
c::> &. , if
- t he tempe rature of the engine coo lant rises
due to the heat build -up from the engine in
the engine compartment, or
- the engine compa rtment heats up because
the vehicle is parked in i ntense sunlight.
_& WARNING
- To reduce the risk of personal injury nev­
er touch the radiator fan.
- The auxiliary electric fan is temperat ure
controlled and can sw itch on suddenly
even when the engine is not running.
- The a uxiliary radiator fan sw itches on au­
tomatically when the engine coo lant
reaches a certai n 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.
F ig . 1 88 Engin e compart men t: Cover on the b rak e flu­
i d reservo ir
Before you check a nyth ing in the engine com­
partment,
always read and hee d all WARN ­
INGS c::> .&. in Working in the engine compart-
ment on page 219 . .,..

-----------------------------~I~ n~d~ e~x 289
Emergency operation
Emergency braking function (parking
brake) ... .. .. .. ........ ... .. .. .. .. 87
E me rgency sta rting ........ .. .. .. .. . 269
Emergency towing .. .... .... . .. .. .. . 271
Energy management .... ... .. .. .. .. . 192
Battery power . . . . . . . . . . . . . . . . . . . . . 1 7
Driver notification . . . . . . . . . . . . . . . . . . 17
E ng ine
Compartment ..... .... ... .. .. .. ... 221
Coolant .... .. ... ..... ... .. .. .. ... 226
Hood . ..... .. .. ... . .... ... .. .. ... 219
Starting . . . . . . . . . . . . . . . . . . . . . . 80, 83
Start ing with jumper cables .. .. .. .. . 269
Stopping . . . . . . . . . . . . . . . . . . . . . . 82, 84
Eng ine compartment
Safety instructions ..... ... .. .. .. .. . 2 19
Working the engine compartment 219
E ng ine coolan t
I ndicator light . . . . . . . . . . . . . . . . . . . . . 18
E ng ine coolant system .......... ... .. 226
Adding coolant .............. ... ... 227
Chec kin g coolant leve l ..... .. .. .. .. . 226
Checking the eng ine coolan t leve l .. .. . 226
Ra diato r fan ............. .... .. ... 228
E ng ine coolant temperature
Temperatu re ga uge .... ...... .... ... 10
Eng ine data .. ............. .... .. ... 277
E ng ine hood
C losing . . . . . . . . . . . . . . . . . . . . . . . . . . 219
How to release the hood ... .. .. .. .. . 2 19
E ng ine oi l .. ................. ... ... 221
Adding .. .. ............. .. .. .. .. . 224
Addi tives . .. ............. .... .. ... 224
Changing .. ... .. ..... ... .. .. .. ... 225
Check oil leve l .. .. .... ... .. .. .. ... 224
Consumption ..... .... ... .. .. .. ... 224
Indicator light ........... .... .. 17,21
O il consumption .......... .. .. .. .. . 223
O il grades .. ............. .... .. ... 221
O il level symbol ............. .... ... 21
Pressu re malfunction ...... .. .. .. .. .. 17
Sensor defective . . . . . . . . . . . . . . . . . . . . 2 1
Specification and vis cos ity .. .. .. .. .. . 22 1
Eng ine speed limitat io n ..... .. .. .. .. .. 21 Environment
Break-in period ..... . ... ...... ... .. 194
Catalytic converter . .. .. ..... ... .. .. 195
Dispos ing of your ve hicle battery ... .. 233
Driving at high speeds .............. 196
Driving to minimize po llution and noise 196
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217
Fuel economy .. .. .. ..... ......... .
Lea ks unde r you r vehicle ........ ... .
Let ting the vehicle stand and warm up .
Proper disposal of d rained brake flu id .
Proper disposal of drained engine cool ­
ant
. ... .. .. .. .... . ... ...... ... ..
Proper disposal of drained eng ine 196
2 19
196
229
227
o il . . . . . . . . . . . . . . . . . . . . . . . . . 224, 22S
Recycling used engine oil ............ 224
Roof rack . . . . . . . . . . . . . . . . . . . . . . . . . 68
Un leaded fuel .. .. .. . .. .... .... .. .. 214
What shou ld I do with an o ld battery? . 233
EPC
refer to Electron ic power control . . . . . . 20
ESC ( Electronic Stabi lization Contro l)
Warning/indicator lights ..... ... .. .. . 19
E thy l alco ho l (Fuel) . ............. .. .. 215
Event Data Recorder (EDR) .......... .. 185
E xhaust tai l pipes
Cleaning . ... .... .. . .. .. ..... ... .. 209
Expansion tank
Exterior lighting
E xterior m irrors 226
. .. ............... .. . 47
Adjusting . . . . . . . . . . . . . . . . . . . . . . . . . SO
D' . 1mming .. .. .... .. . .. .. ..... ... .. . 51
Heating ... .. .. .. .. .. .. .. .... ... .. . SO
F
Fan
Radiator
Fasten ing
B oos ter sea ts 228
17 4
Convertib le child sa fe ty seats .... .. .. 173
Infant seats . . . . . . . . . . . . . . . . . . . . . . 172
Fasten ing eyes
refer to Tie-downs .... ........... .. . 72
Flat tire Chang ing . .. .. .. .. . .. ....... ... .. 259
flexib le fue l
Floor
. .. .... .. . .. .. ..... ... .. 215
75
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Optional equipment
Marked with an asterisk . . . . . . . . . . . . . . . 6
Othe r equipment (effic iency program) 28
Outside m irrors
refer to Exter ior mirrors . . . . . . . . . . . . . 50
Outside temperature display ... .. .. .. .. 24
Owner's manual How the Owner 's Manua l is o rganized . . . 6
p
Paint
Touch-up . .. .. .. .. .. .... ... .. .. .. . 207
Paint No ... .. ................. .. ... 275
P arce l shelf . ... .. ........ ... .. .. .. .. 75
Park assist . ................ ...... .. 116
Parking ..... .. .. .. .. .... ... .. .. .... 86
Automatic transmission . . . . . . . . . . . . . 93
Valet park ing ............ .... .. .. .. 45
P ark ing brake . ..... .... ... .. .. .. .. .. 85
also refer to Electromechanical parking
brake . ..... .. .. ... . .... ... .. .. .... 85
P ark ing system ............ .. .. .. .. . 116
C le a ning sensors/c amer a .... .. .. .. . 205
Rear . ..... ... .. .. ..... ... .. .. ... 116
Rear,withrearviewcamera ... .. .. .. . 117
P ark ing system (rear) ............ .... 116
Adj ust ing the wa rning tones .. .. .. .. . 117
Park ing system (rear, w ith rear v iew cam-
era) Park ing mode 1 . ............. ... .. 120
P ark ing mode 2 ............. ... ... 121
S afety precautions ........ .... .. .. . 118
Sw itchi ng on/off ......... .. .. .. .. . 119
Sw itching rear view camera on/off ... . 122
Part it ion net . . . . . . . . . . . . . . . . . . . . 70, 7 1
Parts rep lacement . ..... ... .. .. .. .. . 282
P ass-t hrough . . . . . . . . . . . . . . . . . . . . . . . . 7 4
PASSENGER AIR BAG OFF light . . . . . . . . 156
Passive safety system .... ... .. .. .. .. . 127
P eda ls .. .. ... ...... ............. .. 132
Phys ica l pr inc iples of a frontal coll is ion . 138
P olishing .. .. .... ............. .. .. . 20S
Pollutant filter (automatic AC system) . .. 76
Power seat adjustment . . . . . . . . . . . . . . . . . . . . 60
Inde x 293
Power locking system . . . . . . . . . . . . . . . . . 32
Emergency locking . .. ... ...... ... .. . 38
Power w indows . ... . .. ... .... ... .. . 43
Rear lid ... .. .. .. ................. . 39
Se lective unlock feature ............ . 3 7
Settings ........ .. ................ 37
Slid ing/tilting sunroof .. .. .. ... ... .. . 43
Power steering
refer to Electro-mechanical power as-
s ist ...... .. .. .. .. . .............. 190
Power w indow
Convenience opening/closing . ... .. .. . 43
Power w indows .. .. .... ........... .. . 42
Child safe ty locks . . . . . . . . . . . . . . . . . . . 42
Malfunctions .. .. ................. . 44
Pregnant women Spec ial considerations when wear ing a
safety belt . . . . . . . . . . . . . . . . . . . . . . . 142
Proper occupant seating positions ... .. 128
Proper safety belt position ..... ... .. .. 141
Proper seating posi tion
Front passenger ................... 129
O ccupants . .. .. .. .... ........... .. 128
Rea r passengers .. .... ........... .. 130
Protective liner .. .. .... ... .... .... .. . 7S
Q
Quart z clock . . . . . . . . . . . . . . . . . . . . . . . . 12
qua tt ro®
refer to all-wheel drive
191
Question What happens to unbelted occupants? 138
Why safe ty belt s? ............. .... 13 7
R
Radiator fan 228
Rain/ light sensor
Head lights .. .. .. .... ........... .. . 47
Intermittent (w indshield w ipers) . .. .. . S3
Sensor defective . . . . . . . . . . . . . . . . . . . . 22
Reading lights ....... . .. .. ..... ... .. . 50
Rea r doo r su n shade . . . . . . . . . . . . . . 52, 53
Rear fog lights .. ...... ............. . 47
Rea r lid
Automatic operation . .. ..... ... .. .. . 40
Emergency re lease . .. ... .... ... .. .. . 41
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