2010 AUDI A5 CABRIOLET light

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The expansion tank in your vehicle is equipped with an electric coolant
level sensor.
When the coolant level is too low, the warn ing light in the Auto-Check
System ~
page 29 will blink until you add coolant and the level has
been restored to normal. Even though there is an electric coolant
level sensor, we still recommend you check the coolant level from
time to time.
Coolant loss
Coolant loss may indicate a leak in the cooling system. In the event of
coo lant loss, the cooling system should be inspected immed iate ly by
your authorized Audi dealer .
It is not enough merely to add coolant.
In a
sealed system, losses can occur only if the boiling point of the
coolant is exceeded as a result of overheating.
& 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 it to 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 antifreeze or coolant on the
exhaust system or hot engine parts. Under certain conditions, the
ethylene glycol in engine coolant can catch fire.
0 Note
Do not add any type of radiator leak sealant to your vehicle's engine
coo lant. Adding radiator repair fluid may adverse ly affect the func­
tion and performance of your cooling system and could result in
damage not covered by your New Vehicle Limited Warranty.•
Adding coolant
Be very careful when adding engine coolant.
Before you check anything in the engine compartment,
always read and heed all WARNINGS::::::> & in "Working in
the engine compartment" on
page 280.
-Turn off the engine .
- Let the engine cool down.
- Place a thick rag over the coolant expansion tank
=> page 287, fig. 223 and carefully turn the cap counter­
clockwise ::::,
&.
- Add coolant .
- Twist the cap on again
tightly.
Replacement engine coolant must conform to exact specifications
~ page 286, "Coolant". Even in an emergency, if coolant additive
G12 ++, G12+ or G12 is not available, do not use a different additive.
Use plain water instead until you can get the correct additive and can
restore the correct ratio. This should be done as soon as possible .
If you have lost a considerable amount of coolant, then you should
add cold antifreeze and cold water only when the engine is cold.
Always use
new engine coolant when refilling.
Do not fill coolant above the ''MAX" mark. Excess coolant will be
forced out through the press ure re lief va lve in the cap when the
eng ine 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 it to cool down. _.,

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& WARNING (co ntinued )
-Protect your face , hand s and arms from e scaping fluid and
steam by covering the cap with a large, thick rag.
- Tu rn the cap slowl y and very carefully in a counter-clockwi se
direction wh ile applying light, downward pre ssure on the top
of the cap .
- To avoid be ing burned , do not spill antifreeze or coolant on
the exhau st sy stem or hot engine parts . Under certain condi­
tions, the ethylene glycol in eng ine coolant can catch fire .
• Antifreeze i s poi sonou s. Alway s store antifreeze in it s original
container and well out of the reach of children.
• If you drain the coolant, it must be caught and saf ely stored in
a proper container clearly marked "poison ".
0 Note
• Coolant pollutes t he environment and could cause an engine fire.
E xcess coo lan t w ill be forced o ut through the pressure rel ie f va lve in
t he cap when the engine becomes hot .
• If, in an eme rgency, o nly w ate r can be ad ded , the co rrec t rat io
between water and antifreeze::::;,
page 286 must be restored as soon
as possi ble.
~ For the sake of the environment
Dr ained coolant sho uld no t be reused. A lways dispose of used coo lan t
wh ile observ ing all environmental regula tions. •
Radiator fan
The radiator fan switches on autom atically by itself.
Th e radiator fa n is d rive n by the engine via t he V-bel t. The v iscous
cl utch reg ulates t he spee d of the fan accord ing to the tem perature of
t he coolan t.
Safety first
An auxiliary e lectric rad iator fa n* switches o n and off depending on
co olan t tempe rature and ot her vehicle ope rating condi tions.
After you sw itch the engine off, the aux iliary fan can continue running
for up to 10 m inutes -even with the ignition
off. It can even switch on
again la ter by itself ::::;, & , if
• the temperature of the eng ine coolant rises due to the heat build­
up from the eng ine in the engi ne comp artment, o r
• the engine compartment heats up because the veh icle is parked in
in tense s unlight.
LJ}. WARNING
• To reduc e the risk of personal injury never 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 sw itches on automat ically when the
engine coolant rea ches a certain temperature and will continue to
run until the coolant temperature drops .•
Vehicle care Technical data

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Brake fluid
Checking brake fluid level
The brak e flu id l evel c an be checke d with a quick gl ance.
F ig . 2 24 Engi ne
comp artme nt: Br ak e
fluid re ser voi r
Before you check anythi ng in the eng ine compart ment ,
always read and heed all WARNINGS~ & in "Working i n
the e ngine compar tment" on
page 280 .
- Read the bra ke flu id level from the bra ke fluid reservoir
~ page 29 0, fig . 224. The bra ke fluid level must be
between the "MI N" and " MAX" m ark ings.
T he bra ke fluid reservoir is located at the rear partition of the engine
compartmen t on the left side=> page 281 .
The flu id level may drop slightly after some time due to the auto­
m atic adjus tment o f th e br ake pad s. This is no t ca use for alarm.
If the b ra ke fl uid leve l falls considerably below the "MIN" mark, t he
brake warn ing/i nd icator light ( U.S. models:
BRAKE , Canadia n models:
«D> ) will come on=> page 17 and=> page 28 . Do not continue to
operate t he vehicle. The complete brake system should be thoro ughly
c hec ked by an au thor ized Aud i deale r or q ualified works hop a nd the
cause corrected.
If the b rake fluid level is too low, the brake wa
rning/ind icator light will illum inate. Contact a n author ized Aud i
de aler
immediately .
W Tips
The b rake fl uid reservo ir is located un derneath the cover .•
Changing brake fluid
Hav e th e b rake fluid chang ed by an experi enc ed techni ­
c ia n.
Br ake flui d ab sorbs mois ture from the air. If the wate r cont en t in the
brake flu id is too hig h, corros ion in the brake system may result after
a period of time. The boil ing po int of the brak e fl uid w ill also de cre as e
considera bly and d ecrease b raking performance .
T herefo re, the brake f lu id m ust be c hanged
every two years . Always
use new br ake fluid w hich confo rm s to Federal Motor Veh icle Sta n­
dard "F MVSS 116 DOT 4".
T he bra ke fl uid r eserv oir ca n be diffi cult t o rea ch, there fore, we
recommend that you have the brake f lu id changed by yo ur autho rized
Audi dealer. Your dealer has the correct tools , the rig ht bra ke fl uid
and the k now -how to do t his for you .
& WARNING
• Brake fluid is poisonous. It must be stored only in the closed
original container out of the reach of children!
• Brake failure can result from old
or inappropriate brake fluid.
Observe these precautions:
-Use only brake fluid that meets SAE specification
J 1703 and
conform s to Federal Motor Vehicle Standard 116 . Always che ck
with your authorized Audi dealer to make sure you are using
the correct brake fluid. The correct type of brake fluid is also indicated on the brake
fluid reservoir . ~

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& WARNING (co ntinued )
-The brake fluid mu st be new. Heavy use of the brake s can
cause a vapor lock if the brake fluid i s left in the sy stem too
long. This can seriously affect the efficiency of the brakes as
well as your safety . This could result in an accident.
0 Note
B rake fluid will damage the pain t of your ve hicle.
c£> For the sake of the environment
Because of the p rob lem of proper d isposal of b rake fl uid as we ll as
the spec ia l too ls requ ired and the necessary expert ise , we recom­
mend th at yo u have the brake fl uid ch anged by your authori ze d Audi
dealer. •
Battery
General information
Under normal operating cond itions, t he battery in your Audi does not
need any maintenance. W ith
high o uts ide temperatures or long daily
dr ives we recomme nd that yo u have the electro lyte level ch ecked by
an a utho rized Audi dealer o r q ua lified workshop. The e lectrolyte leve l
sho uld also be che cked ea ch t ime the battery i s ch arge d=>
page 293 .
Have t he battery checked when yo u take you r vehicle in for serv ice .
You a re well a dvised to rep lace a batte ry that is o lde r than 5 years.
With certa in ty pes of a irbag deployment, the ba tte ry is disconnected
from the vehicle e lectr ica l system for safety reasons=>
& in "Repair,
c are and disposal of the air bags " on
page 214.
Safety first
Disconnecting the battery terminals
Some vehicle f unctions ( power w indow reg ulators, for examp le) are
lost if the batte ry termina ls a re disconnected . These funct ions have
to be re learned after the battery terminals are connected again . To
prevent this, the battery should only be disconnected from the
vehicle electr ica l system when absolute ly necessary for repairs.
Vehicles not driven for long periods
If yo u do not drive your ve hicle over a period of severa l days o r wee ks,
elect rical compo nents are g radually cut bac k or swi tched off. This
re du ces ene rgy consumption and maintains start ing capability over a
longer period=>
page 2 47.
Take into consideration that when you unlock your vehicle, some
c onvenie nce func tions, such as the master key remote func tion o r
power seat adjustme nt, may not be avai lable. The convenience func­
tions will be available again w he n you t urn on the ign it ion and sta rt
the engine .
Winter operation
During the winter months , battery capacity tends to decrease as
t empe ra tu res drop . This is beca use more power is a lso cons umed
wh ile starting, and the headlights, rear w indow defogger , etc ., are
used more o ften .
Avoid unne cessa ry powe r consum ption, part icu larly in city traffic o r
when traveling only short distances. Let your authori zed Audi dealer
che ck t he capa city of the vehicle b atte ry befo re w inte r sets in
=>
page 293 . A well charged battery will not only prevent start ing
pro blems when t he we ather is co ld, bu t w ill also last l onge r.
[ i ] Tips
If yo ur vehicl e is lef t standi ng fo r seve ral weeks at extremely low
temperatures, the veh icle battery should be removed and stored
whe re it will no t free ze . This will preven t it from being dam aged and
having to be replaced .•
Vehicle care Technical data

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Working on the battery
Be especially careful when working on or near the
battery.
The battery is located in the luggage compartment under the
floor. Before you check anything in the lu~gage compart­
ment, read and heed all WARNINGS=>
&-
Always heed the safety warnings, when working on the vehicle
battery or the vehicle electrical system to prevent injury.
The following WARNINGS are very important when
working on the battery:
Always heed the following WARNING SYMBOLS and safety pre­ cautions when working on the battery.
@
®
Always wear eye protection.
Battery acid contains sulfuric acid. Always wear
gloves and eye protection.
No
- sparks
- flames
- smoking .
When a battery is charged, it produces hydrogen
gas which is explosive and could cause personal
injury.
Always keep the battery well out of reach of chil­
dren .
& WARNING
Whenever working on the battery or on the electrical system,
there is the risk of injury, accident and even fire. Read and heed
the following WARNINGS:
& WARNING (continued)
• Always wear eye protection. Do not let battery acid or any lead
particles get on your skin or clothing. Shield your eyes. Explosive
gases can cause blindness or other injury.
• Battery acid contains sulfuric acid. Sulfuric acid can cause
blindness and severe burns.
-Always wear gloves and eye protection. Do not tilt the
battery because acid could leak out of the ventilation open­
ings.
- If you get battery acid in your eyes or on your skin, immedi­
ately rinse with cold water for several minutes and get medical
attention.
- If you should ingest any battery acid, seek medical attention
immediately.
• Do not expose the battery to an open flame, electric sparks or
an open light.
• Do not smoke.
• Do not interchange the positive and negative cables.
• When working on the battery, be sure not to short-circuit the
terminals with tools or other metal objects. This would cause the
battery to heat up very quickly, which could lead to damage or
explosion and personal injury.
• When a battery is charged, it produces hydrogen gas which is
explosive and could cause personal injury.
• Always keep the battery well out of the reach of children.
• Before work is done on the electrical system, disconnect the
negative ground cable.
• Before performing any work on the electrical system, switch
off the engine and ignition as well as any electrical equipment.
The negative cable on the battery must be disconnected. If you are
just going to replace a light bulb, then it is enough to switch off the lights. ..,_

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If it is not poss ible to use a ba ttery of this type, the new battery must
h ave the same capacity, voltage (12 volts), amperage, const ruct ion
and plug sealing .
When installing the battery, make sure the ignition and all electrical
consumers are turned off .
0 Note
Make sure the vent ilation hose on the side of the battery is
connected, otherwise fumes or battery acid can leak out.
c£' For the sake of the environment
Because of the problem of proper disposal of a battery, we recom­
mend you r author ized Audi dealer change the battery fo r you .
Batteries contain sulfuric acid and lead and must always be disposed
of properly in compliance with all env ironmenta l regu lations.
Disposing of vehicle batteries improperly is very dangerous to the
environment. •
Windshield/headlight washer
container
Fig. 226 Engin e
c o mpa rt m ent : W in d­
s hiel d an d hea dlight*
wa sh er fl uid containe r
Vehicle OP-eration
The washer fluid container is marked with the symbol¢, on
i t s cap.
- Before you check anything in the engine compartment,
always read and heed all WARNINGS ~ & in "Working
in the engi ne compar tment" on
page 280 .
-Lift the filler cap tongue to add washer fluid. You can fill
the container to the top.
- Press the cap back onto the filler neck after filling the
co ntainer.
You can find the reservoir capacit y in the table in=> page 342.
To prevent lime res idue from build ing up on the sp ray jets, use
distilled water when refilling . Always add a glass cleaner solution
(with frost protection in the winter) .
0 Note
Do not mix engine coo lant antifreeze or any other additives to fill up
the windsh ield washer reservo ir. •
Vehicle care Do-it-yourselt service iTechnical data

________________________________________________ T_i_r _e _s _ a_n _ d_ w_ h_ e _ e_l_s __ _
gauge a nd keep chec king the press ure until you reach t he press ure
th at i s cor rect fo r t he lo ad ( pass en ge rs and l uggage) and kind of
dr iving you plan to do .
If the press ure i n any t ire is too low, note the difference betwee n th e
pressu re in t he cold tire a nd the pressure you need and add the air
that you need to reach the correct pressure for t he ve hicle load
( pass enge rs and lugg age) f or th e tires on yo ur vehicle as l ist ed on t he
on your vehicle and in this manua l and the kind of driving you p lan to
do.
Never exceed the maximum inflation pressure listed on the tire
sidewall for any reason.
Remember that the ve hicle m anufac tur er, no t the tire manufa cture r,
determines t he correct tire press ure for the t ires on your veh icle.
It is important to check the tire pressure when the t ires a re co ld .
• Read the requ ired t ire pr essure from t he t ire pr essure lab el. T he
tire pressure labe l is located on the dr ive r's side B-p illar.
• Turn t he valve stem cap co unter-clockw is e t o remove it from the
tire valve.
• Place th e air press ure gauge on the valve .
• Th e tire p res su res sho uld on ly be che cked and adju sted whe n the
tires are cold . The slightly raised press ures of warm tires must not be
re duc ed .
• Adjust the tire press ure to the load you are carry ing.
• Re install the valve s tem cap o n the valve.
When should I check the tire pressure?
Th e correct tir e press ure is especially import ant a t hi gh s peeds. The
pressu re s ho ul d t herefore be chec ke d at least once a mont h and
a lways before sta rt ing a jou rney. Do not fo rget to check the tire pres­
sure for the spare w heel.
When should I adjust the tire pressures?
Adjust t he tire pressure to the loa d you are ca rry ing . After ch ang ing a
w hee l
or replac ing wheels yo u have to adjus t th e t ire press ures on all
Safety first
wheels . In add itio n, you m ust t hen store the new tire pressu res in the
tir e press ure m oni torin g sy stem* =>
page 316.
& WARNING
Incorrect tire pressures and/or underinflation can lead sudden tire
failure, loss of control, collision , serious personal injury or even
death.
• When the warning symbol appears in the instrument
cluster, stop and inspect the tires .
• Incorrect tire pressure and/or underinflation can cause
increa sed tire wear and can affect the handling of the vehicle and
stopping ability.
• Incorrect tire pressures and /or underinflation can also lead to
sudden tire failure, including a blowout and sudden deflation ,
causing loss of vehicle control.
• The driver is responsible for the correct tire pressures for all
tires on the vehicle. The applicable pressure values are located on
a sticker on the driver's side B·pillar.
• Only when all tires on the vehicle are filled to the correct pres­
sure , the ti re pressure monitoring system* can work correctly.
• The use of incorrect tire pressure values can lead to accidents or
other damage. Therefore it is essential that the driver observe the
specified tire pressure values for the tires and the correct pres­
sures for the function of the tire pressure monitoring system*.
• Always inflate tires to the recommended and correct tire pres­
sure before driving off.
• Driving with underinflated tires bend more, letting them get
too hot resulting in tread separation, sudden tire failure and loss
of control.
• Excessive speed and/overloading can cause heat build-up,
sudden tire failure and loss of control.
• If the tire pressure is too low or too high, the tires will wear
prematurely and the vehicle will not handle well.
Vehicle care Technical data

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The tire pressure monitor ing must be reset via rad io or MMI* each
t ime t he press ures are adjusted (e.g. w hen sw itching be tween p artial
and full load pressure) o r after changing or replac ing a tire on yo ur
vehicle => page
316. You ca n find t he recommen ded tire pressures
for your veh icle on the labe l on driver's s ide B-pilla r => page
300.
Tire tread circ umference and vibrat ion characteristics can change and
c a u se a tir e pressure war ning if:
• the t ire pressure in one or more tires is too low,
• t he tire ha s structur al dam age,
• the tire press ure was changed, wheels rotated or rep laced but the
TPM S was no t reset=> page
316.
Warning symbols
1..1' Loss of press ure in at least one tire=> &. Check the tire or tires
and replace or repair if necessary. The indicator light (• in the instru­
me nt cluste r a lso illuminates=> page
12. Check/correct the p res­
sures o f all four tires and reset TPMS via rad io or MMI *.
rr :; (T ire Pressu re M on itor ing System) Tire pres sure! System
malfunction.
If T ,.;> appears after switching the ignition on or w hile
dr iv ing => page
315, fig. 23 3 and the indica to r lig ht 'in th e instr u­
me nt clus ter b links for approx ima tely one m inute and the n stays on,
there is a system ma lf u nct io n. See your authorized Audi dealer as
soon as poss ible.
& WARNING
• If the tir e pres sure indicator appears in the instrument cluster
display, one or more of your tires i s significantly under-inflated.
Reduce your speed immediately and avoid any hard steering or
braking maneuvers. Stop as soon a s possible and check the tires
and their pressures . Inflate the tire pressure to the proper pres­
sure as indicated on the vehicle 's tire pressure label=>
page 300.
Driving on a significantly under -inflated tire causes the tire to
overheat and can lead to tire failure. Under -inflation also is likely
to impair the vehicle's handling and stopping ability.
& WARNING (co ntinued )
• The driver is re sponsible for maintaining the correct tire pres­
sures . You must check the tire pres sures regularly .
• Under certain conditions (such as a sporty driving style , winter
conditions or unpaved roads) , the pressure monitor indicator may
be delayed.
• Ask your authorized Audi dealer if run-flat tires may be used on
your vehicle . Your vehicle registration becomes invalid if you u se
the se tires when not permitted. Damage to your vehicle or acci­
dents could also result.
[ i ] Tips
• T he tire pressure monito ring system stops working when there is
an ES P/ABS malf u nctio n.
• Using snow cha ins may res ult in a system ma lf u n ct ion .
• The tire pressure mon itor ing system on your Au di was calibrated
using t ires with the "AO" or "RO " id ent ificat ion . We re comme nd
using these tires. •
Applies to vehicles: with tire p ressure monito ring sys tem
Reset tire pressure monitoring system
I f the tire pressure is adjus ted, wheels are rotated or
changed, th e TPfvf S must b e re set via radio or fv1fv1 I*.
- Turn on the ign it ion .
- Sele ct: Fu nct ion bu tton
[C AR]> Tire pressure monitoring
> Store now.
[ i ] Tips
Before resett ing the TPMS, the current pressures of all four t ires
mus t co rrespo nd to the specifie d val ues. A djust the tire pre ssure and
~