cooling AUDI S4 2014 Owners Manual

Safety belts . . . . . . . . . . . . . . . . . . . 13 8
General notes . . . . . . . . . . . . . . . . . . . . 138
Why safety be lts? . . . . . . . . . . . . . . . . 139
Safety belts . . . . . . . . . . . . . . . . . . . . . 141
Safety belt pretens ioners . . . . . . . . . . 144
Airbag system ................ .
Important things to know ......... .
Front airbags ................... .
Mon itor ing the Advanced Airbag
System ........................ .
Side airbags ............. .... .. . .
Side curta in a irbags .............. .
Child Safety ........ .... ... .. . .
Impor tant things to know ......... .
C hi ld safety sea ts ................ .
I nstall ing a chi ld safety seat . ... .. . .
L A T CH Lower anchorages and tether
for children ... .... .... ... .. .. .. . .
Addit ional Information
Vehi cle operat ion ..... .. .. .. . .
Intelligent technology .. .. .. . .
Not ice about data recorded by vehicle
control modules .......... .... .. . .
Electronic Stabilization Control (ESC) .
Braking .. ... ................ ... .
E lect ro-mechanical power assist ,
dynamic stee ring ................ .
Driving w ith your qu attro ......... .
E ne rgy management ... ... .. .. .. . .
Driving and environment ... ..
The first 1,000 miles (1,500 km) and
afterwards ... ... ..... ... .. .. .. . .
Avoid damaging the vehicle ... .. .. . .
Driving through water on roads ... . .
Catalytic converter .......... .. .. . .
Shutting down vehicle ............ .
Operate your vehicle econom ically and
minim ize pollution ............... .
a llroad: Driv ing offroad ........ ... .
Trailer towing ... ... ... .. .. .. . .
D riving w ith a t railer ............. .
Trailer towing tips ........ .... .. . . 146
146
150
156
16 1
164
167
167
173
17 7
18 1
185
186
186
186
186
189
19 1
19 2
193
195
195
195
195
196
197
197
199
20 1
20 1
203
Table of contents 3
Vehicle care . . . . . . . . . . . . . . . . . . .
204
Vehicle care and cleaning . . . . . 204
Genera l information . . . . . . . . . . . . . . 204
Car washes . . . . . . . . . . . . . . . . . . . . . . 204
Cleaning and care information . . . . . . 205
Fuel supply and filling your
fuel tank ..... .. .. . ............ .
Gasoline .. .. .. .... ..... ..... ... .
Fuel tank .. .. .. .. .. . .. .... ...... .
Checking and filling .......... .
Engine hood ... ... .............. .
Engine compartment ............. .
E ngine oil . .. .. .. ... .. .. ..... ... .
E ngine cooling system ............ .
B rake fluid .. .. .. .. . ............ .
Battery ... .. .... .. . .. .. ..... ... .
Windshie ld/headlight* washer
container ... .... ... .. .. ..... ... .
Tires and wheels ... ..... ... .. .
Tires ... .. .. .. .... . ... ...... ... .
Tire pressure monitoring system
Do-it-yourself service ...... .. .
What do I do now? ...... ... .. .
Vehicle tool kit . ...... ........... .
Space-saving spare tire (compact
spare tir e) .... ... .. ............. .
Inflatable spare tire .............. .
Inflat ing i nflatable spa re tire ...... .
Changi ng a wheel . .... ........... .
Fuses and bulbs ...... ........ .
Fuses ..... .... .. .. . ............ .
B ulbs ..... .. .. .. .. .. ........... .
Emergency situations ........ .
Genera l ... .. .. .. ............... .
St art ing by p ushing or towing ...... .
Star ting with jumpe r cables .. ... .. .
Use of jumper cables . .. ..... ... .. .
Emergency towing wit h commercia l
tow truck ... .. .. .. .. ........... .
Lifting vehicle .. .. ............... . 209
209
211
214
214
216
216
2
21
224
225
228
2 3 0
230
249
252
252
252
252
253
254
255
261
2 61
264
2 66
2 66
2 66
266
267
268
270
•
•

Instrument s and warning /indicator lights 11
A WARNING
- Always observe the warning in
c::> page 214 , before opening the hood
and checking the engine coolant level.
- Never open the engine hood if you see or
hear steam, or if you see engine coolant
dripping from the engine compartment.
You could burn yourself. Let the engine
cool off first so that you cannot hear or
see any steam or engine coolant .
(D Note
-Mounting additional lights or accessories
in front of the air inlets reduces the cool­
ing effect of the rad iator. At high outside
temperatures or high eng ine load , the
engine could overheat.
- The front spoiler has been designed to
properly distribute the cooling air when
the veh icle is moving .
If the spoiler is
damaged , this cou ld reduce the cooling
effect and the engine co uld then over­
heat. Ask your authorized Aud i dealer for
assistance.
Tachometer (engine rev counter)
The tachometer indicates the engine RPM
(revolutions per minutes).
I f engine RPM drops below 1,500, you should
downshift to the next lower gear . T he red area
at the end of the scale indicates maximum
perm issible engine RPM after the break-in pe­
riod. Before reaching this area, move these­
lector lever to position 0/5 or ease your foot
off the accelerator pedal.
@) Note
The tachometer needle@c::> page 10 ,
fig. 3 shou ld only briefly be in the red
zone: you could damage your engine! The
beg inning of the red zone varies depend-
ing on the engine .
@) For the sake of the environment
Upshifting early saves fuel and reduces en­
gine noise.
~ button
Fig. 4 SET button in th e ins trume nt cluster
The !SET ! button performs the following func­
tions:
Switching on time, date, temperature
display and odometer
The display appears for approximate ly 30 sec­
onds when you press the
I S ET ! button c::> fig . 4
with the ignit ion off .
Starting the Auto-Check sequence
The Auto-Check system constantly monitors
certa in individual functions and components
of the vehicle when the ignition is turned on
and when the vehicle is moving .
With the ignition turned on, you can start the "Auto-Check sequence" by pressing the
! SE T!
button . You can perform an Auto-Check se­
quence when the vehicle is stationary and the
ignition is turned on or when the vehicle is
moving slower than 3 mph (5 km/h).
In addition, the number of keys initialised for
your vehicle is displayed.
L2 3 /3 means that
three keys have been initialised . This feature
enables used car buyers to make sure they
have received all of the keys.
If you are given only two keys, for ins tance ,
you should take the vehicle and the ex isting
keys to an authorized Audi dealer to have the
missing key d isabled .
It is also important to
notify your insurance company about the loss.
Setting the speed warning
By pressing the !SET ! button briefly, you can
set threshold 1 of the speed warning wh ile
you are driving
c::> page 88 . By maintaining II>

Instruments and warning/indicator lights 17
0 Battery
The. warni ng/ind icator lig ht ill umin ates
when yo u switc h on th e igni tion and mu st go
ou t aft er the engine has s tarte d.
• Alternator fault: Battery is not being
charged
I f the i ndicator lig ht t urns on and t he mes­
sage appears, the re is a malf unction in t he
gen erato r or vehicle e lectr ica l system .
Drive to yo ur autho rized Aud i dea le r or quali­
fied workshop immediately . Because the vehi­
cl e ba ttery is disc harging, tur n off a ll unnec­
essa ry ele ct rical eq uipment suc h as th e radio.
S eek profession al ass is ta nce if the batte ry
ch arg e leve l is t oo low.
(•) low battery: Battery will be charged
while driving
If t he indicator lig ht t urns on and t he mes­
sage appears, the re may be limited starting
ab il ity .
If
t hi s message turns off after a litt le w hile,
the battery charged enough wh ile driving.
If t he message does not turn off, have your
author ized Audi dealer or qua lified wor kshop
c o rrect the malfunctio n.
't:::7: Engine oil pressure
The red en gine oil pressure warning symbol
requires immediate service or repair . Driving
with a low-oil -pressure indication is likely to
inflict severe damag e to the engine.
• Turn off engine! Oil pressure too low
If th e ind ic a tor lig ht tur ns on an d th e me s­
sage a ppears, the oil press ure is too low .
~ Pull off the road.
~ Sto p th e ve hicl e.
~T urno ff th e e ngine.
~ Check the engine oil level <=> page 219.
~ If the engi ne oi l leve l is too low , add engine
o il
<:!) page 219. Make sure that the oil pres ­
s ur e warning symbol. appea rs no longer
i n t he d isp lay before you start d riving aga in.
~ If the en gine o il level is co rrec t and the in di­
cato r light still turns on, turn the e ngine
off
and do not cont inue driv ing . See k pr ofessi o­
na l assistance .
(D Tips
- The engine oil pressure symbol. is
not an indicator for a low engine oil lev­
el. Do not rely on it. Instead, check the
oil level in your engine at regular inter­
vals, preferably each time you refuel,
and always before going on a long trip.
- The yellow oil level warning indication
Ill requires oil refill or workshop serv­
ice without delay . Do not wait until the
red oil pressure warning. starts to
flash before you respond to the low oil level warning
Ill. By then, your engine
may already have suffered serious dam­
age.
·
~ .. Engine oil level
• WARNING: Please add oil immediately
If the indica to r li ght and the message a ppear,
add engine oil immediately
c:!) page 216 .
El Add oil, max XXXX l. You may cont. driv .
When the symbol El and dr ive r message ap ­
pear, add the amoun t of oil app ear ing in t he
display at t he next oppo rtunity
r:=> page 21 6.
-L Engine cooling system
A malfunction in the engine cooling system
must b e repaired as soon as possibl e .
• Turn off engine and check coolant level
If the indicato r light turns on and the mes­
sage appears, the coolant temperature is too
high or the coolant leve l is t oo low.
~ Pull off t h e roa d.
~ Stop the vehicle.
~ Tu rnoff the engine .
~ Check coolant level<=> page 221 .
~ Add coolant if necessary <=> page 222.
~ Continu e dr iv in g o nly afte r the engin e cool-
ant wa rning/ind icator light goes ou t. ..,.

18 Instrum ent s and w arn ing /indic ato r light s
• Contact your authorized Audi dea ler fo r as-
sistance if necessary.
I f the engine coolant level is co rrect, then the
radiator fan may be the cause of the malfunc­
tion .
• Coo lant temper ature! L et engine run
with vehicl e sta tionary
If the indicator light turns on and the mes­
sage appears, let the engine run at idle fo r a
few minutes to cool down.
A WARNING
- If your veh icle should break down for
mechanical or other reasons, park at a
safe distance from moving traffic, turn
off the engine and turn on the hazard
warning lights
c:> page 49, Emergency
flashers.
-
- Never open the hood if you see or hear
steam or coolant escaping from the en­
gine compartment -you risk being scald­
ed . Wait until you can no longer see or
hear steam or coolant escaping.
- The engine compartment of any veh icle
is a dangerous area. Before you perform
any work in the engine compartment,
tu rn of the eng ine and allow it to cool.
Follow the wa rning sticke rs
c:> page 214.
([) Note
Do not continue driving if the. symbol
illuminates . There is a malfunct ion in the
eng ine cooling system -you could damage
your eng ine .
@ -Steering column lock
• Stee ring defecti ve! Do not dri ve vehicle!
If the indicator light turns on and t he mes­
sage appears, the re is an elect ronic steer ing
col umn lock ma lfunction. You cannot switch
the ignition on.
Do
not tow your vehicle because it ca nnot be
steered. Seek professional assistance.
Ill S tee ring lock: Contact de aler!
If the indicator light turns on and the mes­
sage appears, there is an e lectronic steering
co lumn lock malfunct ion .
Drive to your authorized A udi dealer immedi­
ate ly to have the ma lfunction corrected.
A WARNING
-
Your veh icle must not be towed in the
event of a malfunction in the electronic
steering co lumn lock because it cannot be
steered due to the locked steering. If it is
towed with the steering locked, there is
the r isk of an accident.
© -Ignition lock
• Ignition lock d efe ctive . Contact deal er!
If the indicator light turns on and the mes­
sage appears, do
not switch the ign it ion off
because you may not be able to sw itch it on
again .
Drive to your authorized Audi dealer immedi­
ately to have the malfunction corrected .
On vehicles with convenience key*, the engine
should not be switched off using the
I START ENGINE STOPI button because the en­
gine cannot be started again after the ignition
has been switched off .
(D Tips
The symbol's appearance might be differ­
ent in some models.
$=J I[}. Electronic Stabilization Control
( ESC)
If the JjJ ind icator light blinks while driv ing,
the ES C or ASR (Anti-Slip Reg ulation) is active­
ly reg ulating .
If the
GJ ind icator light tu rns o n, the system
has switched the ESC off. In this case, yo u can
swi tch the ign ition off and then on to switch
the ESC on again. The indicator light turns off
when the system is functioning fu lly. ..,..

76 Warm and cold
Warm and cold Climate controls
Description
The climate control system warms, cools and
adds humidity to the air in the vehicle interior.
It is the most effect ive when the windows and
sunroof are closed . If there is a build-up of
heat inside the vehicle, ventilation can help to
speed up the cooling process.
I n all heating mode functions except
defrost,
the blower on ly switches to a higher speed
once the engine coolant has reached a certain
temperature.
Condensat ion from the cooling system can
drip and form a puddle of water under the ve­
hicle. This is normal and does not mean there
is a leak.
Pollutant filter
The pollutant filter removes pollutants s uch
as dust and pollen from the air.
The air pollutants filter must be changed at
the intervals spec ified in you r Warranty
&
Maintenance booklet, so that the air condi­
tioner can properly work.
If you drive your vehicle in an area with h igh
a ir po llution, the fi lter may need to be
changed more frequent ly than specified in
your Aud i Wa rranty
& Ma intenance booklet. If
in doubt, ask your authorized Audi Service Ad ­
visor for advice .
Key coded settings
The climate control settings are automat ically
stored and assigned to the remote control key
that is in use.
A WARNING
Reduced visibility is dangerous and can
cause accidents.
-
- For safe driving it is very important that
all windows be free of ice, snow and con­
densation.
- Comp letely familiarize yourself with the
proper use and function of the heating
and ventilation system and especially how to defog and defrost the windows.
- Never use the windshield wiper/washer
system in freez ing weather unt il you
have warmed the windshield first, using
the heating and ventilation system. The
washer solution may freeze on the wind­ shie ld and reduce visib ility.
(D Note
- If you suspect that the air conditioner
has been damaged, switch the system
off to avoid further damage and have it
inspected by a qualified dealership.
- Repairs to the Audi air conditioner re­
quire special technical know ledge and
special tools. Contact an authorized Aud i
dea ler fo r assistance.
@ For the sake of the environment
By reducing the amount of fuel you use,
you also reduce the amount of pollutants
emitted into the air.
(D Tips
-Keep the air intake s lots (in fro nt of the
w indshield) free from ice, snow and de ­
bris in order to maintain the proper func­
tion of the climate control system.
- T he energy management system may
switch the seat heating* or rear window
defroster off temporarily . These systems
are available again as soon as the energy
balance has been restored.
- Air escapes through vents under the rear
window. When placing items of clothing
on the luggage compartment cover, en­
sure that the openings are not covered.

Warm and cold 77
Operation
We recommend pressing the IAUTO I button and setting the temperature to 72 °F (22 °C).
Fig. 91 Automatic cl imate control system: control
Fig. 92 3-zone deluxe automatic climate control': controls
Press the buttons to turn the functions on or
off. Use the d ials to adjust the temperature,
the blower speed and the a ir distribution. The
L ED in a button will light up when the func­
tion is switched on. The settings are displayed
for a few seconds in the radio or MMI* display.
In vehicles with a 3-zone deluxe automat ic cl i­
mate control systems *, the dr iver and front
passenger side can be adjusted separately.
The settings are also d isplayed in the climate
con trol system display.
IOFFI Switching the climate control
system on/off
The IOF FI button switches the climate control
sys tem on or off.
It also switches on when you press the knob. Airflow from outs
ide is
blocked when the climate control system is
switched off.
IACI Switching cooling mode on/off
The air is not coo led and humidity is not re­
moved when cooling mode is switched off.
This can cause fog on the w indows. Cooling
mode switches off automatically when the
outside temperature is be low zero.
1- 1 Switching recirculation mode on/off
In recircu lation mode, the air inside the vehi ­
cle is circulated and filtered. This prevents the
unfiltered air outside the vehicle from enter­
ing the vehicle interior. We recommend

78 Warm and cold
switching recirculation mode on when driving
through a tunnel or when sitting in traffic
c:::> &. .
The IAUTOI button or I@ FRONT I butt on
switches recircu lation mode off .
IAUTO I Switching automatic mode on
Automatic mode ma inta ins a constant tem­
perature inside the vehicle. Air temperature,
airflow and air distribution are controlled au­
tomatically.
Adjusting the temperature
Temperatures between 60 °F (+16 °C) and
84 °F (+28 °C) can be set . Outside of this
range,
LO or HI will appea r in the climate con­
trol system disp lay. At both of these settings,
the climate control system runs continuously
at maximum cooling or heating power . There
is no temperature regu lation.
~ Adjusting the airflow
You can adjust the airf low manually to su it
your needs . To have the airflow regulated au­
tomatically, press the
!AUTO ! button.
~ Adjusting the air distribution
You can manually select the vents where the
a ir will flow. To have the air d istribution regu­
la ted automatically, press the
IAUTOI button .
~ Adjusting seat heating*
Pressing the button switches the seat heat ing
on at the highest sett ing (level 3) . The LEDs
indicate the temperature leve l. To reduce the
temperature, press the button again. To
switch the seat heating off, press the button
repeatedly until the LED turns off.
After 10 minutes, the seat heating automati­
cally switches from level 3 to leve l 2.
[ill Adjusting seat ventilation*
Pressing the button switches the seat ventila­
tion on at the highest setting (level 3) . The
LE Ds indicate the ventilat ion level. To reduce
the ventilation leve l, press the button again.
To switch the seat ventilat ion off, p ress the
button repeatedly until the LED turns off.
I@ FRONT I Switch the defroster on /off
T he w indshield and side windows are defrost­
ed or cleared of condensation as quickly as
possible . The maximum amount of air flows
main ly from the vents below the windshield.
Recirc ulation mode switches off. The tempera­
ture should be set to 72 °F (22 °C) or higher.
The temperature is controlled automatically.
The
! AUTO ! button switches the defroster off.
l!liil REAR I Switching rear window heater
on/off
The rear window heater only operates when
the engine is running . It switches off auto­
matically after a few minutes, depending on
the outside temperature.
To prevent the rear window heater from
switching off automatically, press and hold
the
I Cilil REARI button for more than 2 seconds.
This remains stored until the ign ition is
switched off .
Air vents
You can open and close the center and rear air
vents using the thumbwheels. The levers ad ­
j ust the direction of the airf low from the
vents.
In vehicles with a 3-zone de luxe automatic cli­
mate control system*, yo u can adjust the air
temperature in the rear by turn ing the thumb­
wheel toward the red side to make it warmer
or toward the blue side to make it cooler .
A WARNING
-Do not use the recirculation for extended
periods of time. The windows could fog
up since no fresh air can ente r the vehi­
cle. If the windows fog up, press the air
recirculation button again immediately
to switch off the air reci rculation func­
tion or se lect defrost .
- I ndividuals with reduced sensitivity to
pain or temperature cou ld develop burns
when using the seat heating function. To
reduce the risk of injury, these indiv idu­
als shou ld not use seat heating.

Trailer towing Driving with a trailer
General information
Your Audi was designed primarily for passen­
ger transportation .
If you plan to tow a tra iler, p lease remember
that the addit ional load will affect durab ility,
economy and performance .
T railer towing not on ly places more stress on
the vehicle, it also calls for more concentra­
tion from the driver.
F or this reason, a lways fo llow the operating
and driving instructions provided and use
common sense.
Technical requirements
Traile r hitch
Use a weight-carrying hitch conforming to the
gross trailer we ight. The hitch must be suita­
b le for your veh icle and trailer and must be
mounted secure ly on t he veh icle's chassis at a
technically sound location . Use only a t railer
h itch w ith a removab le ball moun t. A lways
check with the tr ailer hitch man ufac tur er to
make sure that you are using the correct
hitch.
Do not use a bumper hitch.
T he hitc h must be installed in such a way that
it does not inte rfe re with the impac t-absorb­
i ng b umper syst em. No modifica tions should
be made to the vehicle exhaus t and b rake sys­
tems . From t ime to time, check that a ll hitch
mo unt ing bolt s remain securely fas tened.
W hen you are not tow ing a trailer, remove the
trai le r hi tch ball moun t. T h is prevents the
hi tch from causing damage sho uld your ve hi­
cle be str uck from be hind
¢ &. .
Trailer brakes
If yo ur tra iler is equ ipped w it h a braking sys­
tem, check to be su re that it conforms to a ll
r eg ulat io ns.
Trailer towin g 201
The trailer hyd ra ulic bra ke system must not be
direct ly connected to the vehicle's hydraulic
brake system
¢ &. .
Safety chains
Alw ays use s afety chains between your ve hicle
and t he tra ile r.
Trailer lights
Tra ile r lights m ust meet all reg ulations . Be
su re to check w ith your authorized Audi dealer
fo r c orrec t w iri ng, sw itches, and relays.
Mirrors
If you a re unable to see the traffic behind you
u sing the regula r outside m irrors, then you
must insta ll ext ended mir ro rs. It is important
t h at you
always have clea r vis io n to the rear .
.8, WARNING
- If a trai ler has elec trica l br ake s plea se
no te th at t hese bra kes are not activat ed
by the fa ctory -fit ted control unit -risk of
accident!
- After removing the t railer hi tch, do no t
s to re it in yo ur vehicle . In case of sudden
brak ing, the hitch could fly fo rward and
in ju re you or yo ur passenge rs .
Operating instructions
Maximum traile r we ight
-
A trai ler fo r you r vehicle is limited to a typical
class 1 or class 2 tra iler.
Trailer load distribution
B e sure the lo ad in the tra iler is h eld secure ly
i n p lace to p reven t it from shifting fo rward,
backward or sideways.
Never allow a passenger to ride in a trailer
¢ &. in Driving instru ctions on page 20 2.
Engine cooling system
Towing a t railer ma kes t he engine wor k hard ­
er . It is impo rta nt that the cooling system's
perfo rman ce is up to the additional load.
Make sure tha t the coo ling sys tem h as enough
f lu id . .,..
•
•

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
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 specially conditioned water and the
manufacturer's glycol-based coolant addi-
tive G13 antifreeze with anticorros ion 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 coo l­
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 antifree ze 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, antifree ze is added at
the factory for temperatures down to:
- -31°F(-35°C)USA
- -40 ° F ( - 40 °C) Canada.
I f you must add coo lant, use a mixture of wa­
ter and coolant addit ive. Mixing the coolant
additive with distilled water is recommended.
& WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS
c::;, .&. in Working in the engine
compartment on page 214.
(D Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in
Checkin g and fillin g 221
your vehicle is sufficient to meet the cli ­
mate conditions. This is especia lly impor­
tant if you live in a region where the win­
ter is extremely co ld. 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 Veh icle
Limited Warranty.
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance.
Fig. 185 En gin e compar tment: Cover on the coo la n t
expansio n tan k
"' Before you check anything in the engine
compa rtme nt,
always read and heed all
WARNINGS c::;, .&, in Working in the engine
compartment on page 214.
"'Park your vehicle on a level su rface .
.,. Turn off the ignition .
.,. Read the engine coolant level from the cool­
ant expansion tank
i=> fig . 185, c::;, page 216,
fig . 182. With a cold engine, the coolant Iii>

222 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 216.
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 the 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 sealed 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 214 .
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 221 , fig. 185 and carefully turn
the cap counter-clockwise
c:> .&_ .
.,.. Add coo lant m ixed in the correct rat io
c:> page 221, 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 221, 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 . .,.