2015 AUDI TT ROADSTER cooling

172 Checking and filling
Checking the engine coolant level
The engine coolant level can be checked with
a quick glance.
F ig. 132 Eng ine compartme nt: cover on the coo lant
expansion tank
Before you check anything in the engine com­
partment,
a lway s read and he ed a ll WARN­
ING S o .A in Working in the engine compart­
ment on page 164.
., Park your vehicle on a level surface.
., Switch the ign ition
off .
., Read the coolant level at the coolant expan­
sion tank
opage 166, fig . 128. With a cold
engi ne, it must be above the "min" mark.
With a hot engine, it can be a l ittle above
the indicated range.
The location of the coolant expans ion tank
can be seen in the engine compartment illus­
tration
o page 166.
To obtain an accurate read ing, the eng ine
must be sw itched
off.
The expans ion tank in your vehicle is equipped
with an electric coolant level sensor.
When the coolant level is too low, the warning
light in the Auto-Check System
opage 17will
illum inate until you add coolant and the level
has been restored to normal. Even thoug h
there is an electric coolant level sensor, we
still recommend you check the coolant leve l
from time to t ime.
Coolant lo ss
Coolant loss may indicate a leak in the cooling
system. In the event of coolant loss, the cool­
ing system should be inspected immediately by your authorized Audi dea
ler .
It is not
enough merely to add coo lant .
In a
seal ed system, losses can occu r on ly if
the boi ling po int o f the coo lan t is exceeded as
a res ult of overheating.
(D Note
Do n ot add any type o f radiator leak se al­
ant to your veh icle's engine coo lant. Add ­
i ng radiator repa ir fl uid may adverse ly af ­
fect the functio n and performance of you r
cooling system and could result in damage
not cove red by your New Veh icle l imited
Warranty.
Adding coolant
Be very careful when adding engine coolant.
Before you check anyth ing in the engine com ­
partment,
a lways read and heed all WARN­
INGS o .A in Working in the engine compart­
ment on page 164.
Req uirement: There m ust be a res idual
amount of coo lant in the expansio n tank
o (D .
., Tur n off the engi ne .
., le t t he eng ine cool down.
., Place a thick rag ove r the coolant expansion
tank
o page 172, fig. 132 and carefully
twist the cap counter-clockwise o _A .
., Add coolant m ixed in the correct ratio
o page 171, Coolant up to the MAX mark­
ing.
.. Make sure that the flu id level remains sta-
b le. Add more coo lant if necessary.
., Twi st the cap o n aga in
tightly.
Replacement engine coo lant must conform to
exact spec ificat ions
o page 171, Coolant .
We recommend using only coolant addit ive
Gl2++, Gl3 or in an emergency Gl2+. Do
not
use a different add itive . In an emergency use
plain water until you can get the co rrect addi­
t ive and can resto re the correct ratio. This
sho uld be done as soon as poss ib le.

If you have lost a consi derable amount of
coolant, then you should add co ld antifreeze
and cold water only when the engine is co ld .
Always use
new engine coolant when refi lling.
D o not fi ll coolant above the "MAX " mark . Ex­
cess coolant will be forced out th rough the
p ress ure rel ief valve in the cap when the en­
g ine becomes hot .
A WARNING ,_________
- The cooling system is under press ure and
can get very hot . Reduce the risk of
sca ld ing from hot coo lant by following
these steps.
- Tur n
off the eng ine and a llow itto cool
down.
- P rotect your face, hands and arms from
escap ing f lu id a nd steam by cover ing
the cap wi th a la rge, thick rag.
- Turn the cap slow ly and very ca refully
in a cou nte r-clockw ise d irect ion while
a pply ing ligh t, downw ard p ress ure on
the to p of the cap.
- T o avo id being burned, do no t sp ill an­
tifreeze or coolan t on the exhaust sys­
tem or hot engine parts . U nder certa in
conditions, the ethylene glyco l in en­
gine coolant can catc h fire .
- Antifreeze is poisonous . Always store an ­
tifreeze in its original container and we ll
o ut o f the reach of children.
- If you drain the coolant , it must be
caught and safely stored in a proper con­
tainer clearly marked "poison".
@ Note
- Do not add coolant if the expansion tank
i s empty . Ai r could enter the cooling sys­
tem and damage the engine. If this is
the case, do not continue driving. Seek professional assistance.
- Coolant po llutes the env ironment and
could cause a n engine fire. Excess coo l­
ant wi ll be f orced out through the pres­
su re re lief valve in the cap when the en ­
gine becomes hot.
Checkin g and fillin g 173
- If, in an eme rgency, on ly wate r can be
added, the co rrect ratio between water
and antifreeze ¢
page 171 must be re­
stored as soon as possible.
@) For the sake of the environment
Drained coolant sho uld not be reused. A l­
ways d ispose of used coolant while observ­
i ng a ll environmental regulations.
, Radiator fan
The radiator fan switches on automatically by
itself .
The electric radiator fan is controlled by ther­
moswitches that switch on and
off depending
on coo lant and eng ine compartment tempera­
tures.
An a uxiliary electric radiato r fan* sw itches on
and
off depending on coolant temperature
and othe r vehicle ope rat ion conditions .
After yo u switch the eng ine off, the aux iliary
f an can continu e running for up to 10 m inut es
- even with the ignition off. It can even switch
on again later by itself¢ & , if
- t he temperatu re of the engine coo lant rises
due to the hea t build -up from the engine in
the engine compa rtment, or
- the engine compa rtment heats up because
the vehicle is parked in intense sunlig ht.
A WARNING ~
- To reduce the risk of persona l in ju ry nev-
er touch the radiator fan .
- The a uxiliary electric fan is tempe rat ure
contro lled and can switch on suddenly
even when the engine is not running.
- The a uxiliary radiator fa n sw itches on a u­
tomatically when the engine coo lant
reaches a certai n temperature and will
continue to ru n until the coo lant temper­
ature drops. •
•

_______________________________ ___:I~n ~d ~e:.::x 231
Temperature ... ... .... ... .. .. .. .... 68
Venti lation ..... .. .... ... .. .. .. .... 67
C lock ..... ................... .. ....
11
Clutch overheating . . . . . . . . . . . . . . . . . . . 86
Cold tire inflat ion pressure ... .. .. .. .. .
184
Com ing home .............. ... ... ... 49
Compass m irror . ....... ... .. .. .. .. .. 58
Comp lian ce .. ............. .. .. .. ... 228
Consumer Info rmat ion . . . . . . . . . . . 98, 225
Contact ing NH TSA . ..... ... .. .. .. .. .. 98
Controls Cleaning . .. .. ........... .. .. .. ...
156
Controls and d isp lays ....... .. .. .. .. .. . 8
Convenience close/open feat ure
Powe r top . . . . . . . . . . . . . . . . . . . . . . . . .
43
Windows . ..... ...... ... .. .. .. .... 40
Conve rtible c hild safety sea ts .. .. .. .. .
134
Convertible locking retractor
Activating . . . . . . . . . . . . . . . . . . . . . . . .
139
Deactivating ................ .... .. 139
Using to secure a ch ild safety seat 137, 139
Convertible top . ........... .. .. .. .. .. 41
Au tomatic convertible top .. .. .. .. .. .. 43
Emergency operation ........... .... . 44
Ge ne ral i nfo rmation .......... ... ...
41
manual conve rtib le top .. ... . .. ... ... 42
War ning/ indic to r l igh ts .... .. .. .. .. ..
1 7
W ind deflecto r ........... .... .. .. .. 44
Cooling system . . . . . . . . . . . . . . . . . . . . .
1 71
Expansion ta nk ... ... ... .. .. .. .. .. . 172
Cornering light ............ .... .. .. .. 49
Cruise control . . . . . . . . . . . . . . . . . . . . . . . 77
Changing spee d . . . . . . . . . . . . . . . . . . . . 7 8
Presetting your speed . . . . . . . . . . . . . . . 78
Sw itching
off .... ..... ... .. .. .. .... 78
Sw itching on . . . . . . . . . . . . . . . . . . . . . . . 77
War ning/ indicator lights ... .. .. .. .. ..
21
Cup holder . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Current fuel m ileage
23
D
Damping
refer to Audi magnetic ride ... .. .. .. .. 79
D ata recorder . ..... .... ... .. .. .. ... 14 1
Date display . . . . . . . . . . . . . . . . . . . . . . . . 11
Daytime running lights .... .. .. .. .. .. .. 48
Decla rat ion of compliance
Ce ll phone package .. ... .... ... .. .. 228
E lectronic immob ilizer .. ..... ... .. .. 228
Homelink universal remote control . .. 228
Remo te contro l key ... ............. 228
Decorative deca ls
Cleaning . ... .... ... .. .. ..... ... ..
156
Decorative pa rts/tr im
Cleaning .. .. .. .. .... .............
156
def
What does this mea n when it appears in
the tr ip odometer display? ...........
12
Defective light bulb warning . ....... .. . 20
Defrost ing the w indows . .... ..... .. .. . 70
Determ ining correct load limit ........
189
Digital clock . . . . . . . . . . . . . . . . . . . . . . . . 11
D . · l 1g1ta compass . . . . . . . . . . . . . . . . . . . . . 58
Dimens ions . .. .. .. .... ............. 223
D imming the rearview m irror .. ... .. .. . 53
D ipst ick
Reading the d ipst ick properly ........
169
Displays
Cleaning
156
Distance ... .. .. .... . ... ...... ... .. . 23
Driver informat io n system
Boost ........ .. .. ... ....... ...... 26
E ngine oi l tempera ture .. ..... .. .. .. . 26
Menu but to n .. .. ... ..... ..... .. .. . 25
Menu disp lay . . . . . . . . . . . . . . . . . . . . . . 24
Open door or front lid warning ... .. .. . 22
Outsid e temperature disp lay . . . . . . . . . . 22
Serv ice inte rval display . . . . . . . . . . . . . . 28
Se tting ... .. .. .. .... ...... ....... . 25
Sound system display ... .... ... .. .. .
22
T' np compute r .. .. .. ................ 23
Dr iver seat
refer to Seating position . ..... .. .. .. . 92
Drivi ng
Run -flat t ires . ..... . .. .. ..... ... .. 20 2
Drivi ng safely ...... ........... ......
91
Driving throug h wate r .. .. .. .. ... .. .. 150
D upli cate key . .. .. .... ... .... ...... . 32
Dus t fil ter . . . . . . . . . . . . . . . . . . . . . . . . . . 68
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232 Index
E
Efficiency program ....... .. .. .. .... .. 27
F ue l economy messages ... .. .. .... .. 27
Memory levels . . . . . . . . . . . . . . . . . . . . . 23
Other equipment .. ......... .. .. .. .. 2 7
E lapsed time ... .... ....... .. .. .. .. .. 23
Electro -mechanical power assist . . . 17 , 145
Elect ronic differential lock (EDL) . . . . . . . 141
Warn ing/ indicato r lights ... .. .. .... .. 18
E lect roni c immobili ze r . . . . . . . . . . . . 12, 33
Electronic power co ntrol
EPC warning/ind icator light .. .. .. .... 19
Electronic speed limiter . . . . . . . . . . . . . . . 30
E lect ron ic S tabilization Control ( ESC) .. . 141
War ning/ indica tor l ights . .. .. .. .. .. .. 17
E mergency flasher . . . . . . . . . . . . . . . . . . . 51
War ning/ indicator lights . ...... .. .. .. 21
Emergency locking . . . . . . . . . . . . . . . . . . . 3 7
E mergency opera tion
Conve rtible top .......... .. .. .. .. .. 44
Rear lid . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
E mergency sta rting .. ... ... .. .. .. .. . 216
Emergency towing ......... .. .. .. .. . 218
Ene rgy management ....... .. .. .. .. . 14 6
B att ery power . . . . . . . . . . . . . . . . . . . . 148
D river notification . . . . . . . . . . . . . . . . . 148
Eng ine
C he ckin g and fill ing locations . .. .. .. . 166
Coolan t .. .. ............. .... .. .. . 17 1
D ata .... .. ... ... .... ... .. .. .... . 224
Hood . ..... ... . ...... ... .. .. .... . 164
Starting . . . . . . . . . . . . . . . . . . . . . . 72, 73
Starting with jumper cab les .. .. .... . 216
Stopping . ................. ...... .. 74
E ng ine compartmen t ....... .. .. .. .. . 166
Safety instructions ... ... .. .. .. .... . 164
Working in the engine compa rtment .. 164
E ng ine cooling system ...... .. .. .. .. . 17 1
A dding coolant ........... .. ...... . 17 2
Chec king the eng ine coolan t leve l .. .. . 172
M alfunc tion . . . . . . . . . . . . . . . . . . . . . . . 17
Radiato r fan . .. .. ..... ... .. .. .... . 173
Temperature ga uge .. ... .. .. .. .... .. 11
E ng ine hood
C losing .. ............... .... .... . 164
H ow to release the hood ... .. .. .... . 164 E
ngine oi l .. .... .. ... .. ..... .... . .. 166
Adding ... .... .. .. ... ..... ... .. .. 169
Additives . ... .. .. ... .. ..... ... .. .. 169
Changi ng ..... .. ............. .... 170
Checking the engine oil level ..... .... 169
Indications and conditions requir ing ex -
tra checking ... .. ... .. .. ... ..... .. 169
Oil consumpt io n .. .......... ...... . 168
Oil g rades . .. .... ............. .. .. 166
Recommende d oi l c he ck interv als . .. .. 169
Spec ifi cat ion an d viscosity .. ... .. .. .. 166
T emperature display . .. ..... .... . .. . 26
En gine o il level .. .. ................ .. 19
Engine oi l pressure (ma lfunction) .. .. .. . 16
En gine oi l sensor defective . . . . . . . . . . . . 20
Engine oil temperature indicator ........ 26
Engine speed limitation .. ..... ... .. .. . 19
En vironment
Br eak-in per io d ... ............. .. .. 149
Catalytic converter . .. .. ..... ... .. .. 150
Disposing of your veh icle ba ttery ... .. 175
Driving at high speeds . . . . . . . . . . . . . . 152
Driving to minimi ze po llution and noise 151
Fuel ...... .... .. .. ............... 162
Fuel economy .... ................. 151
Leakage from your vehicle ..... ... ... 164
L etting the vehicle stand a nd warm up . 152
Proper disposal of d rained brak e flu id . 174
P roper d isposal of d rained eng ine cool-
an t ...... .... .. ................. 172
Proper disposal of d rained eng ine
oi l . . . . . . . . . . . . . . . . . . . . . . . . . 169, 170
Recycling used engine oil ..... ... .. .. 169
Un leaded fuel .. .. ............. .. .. 160
What shou ld I do with an o ld battery? . 175
EP C
refer to Elect ronic power co ntrol ... .. . 19
E SC (Electronic Stab ilizat io n Control)
Warning/ind icator lights ........ .. .. . 17
Event Data Recorder (EDR) ........ .... 141
E xhaust tail pipes
Cleaning . ..... .. ... .. ..... .... . .. 156
E xpansion tank . . . . . . . . . . . . . . . . . . . . . 172
Exterior m irrors
Adjust ing . .... .. ............. .... . 52
Dimming ...... .. ..... ....... ... .. . 53
Heating ....... .. ..... ....... ... .. . 52

Electronic Stabilization Control (ESC) . . . 17
Generator .. .......... ... ... ... .... 16
Malfunct ion Indicator Lamp (MIL) ... .. 19
Parking brake ............ .... .. .... 14
Rear spoiler . . . . . . . . . . . . . . . . . . . . . . .
21
Red symbols in the center disp lay ...... 13
Safety belt .... .. .. ..... ... .. .. .. .. 16
Safety systems .................. ... 15
Tu rn signa ls ............. .. .. .. .. ..
21
Yellow symbols in the center disp lay . .. 13
Warranty coverages .................
225
Washer reservoir .. ..... ... .. .. .. ... 179
Wear ind icator ............ .... .. ... 190
Weights ... .. .. .. ........... .......
222
W hat happens if you wear your sa fety belt
too loose? ... .. .... .... ... .. .. .. ... 104
What happens to unbelted occupants? .. 101
What impairs driving safety? . . . . . . . . . . . 92
What should
I do after chang ing a
wheel? .... .. .. .. .. .. .... ... .. .. ... 187
What should I do after replacing wheels? 187
Wheel bolts Torque ..... ................. .. ... 197
Wheels ... .. .. .. ........ ... .. .. .. . 180
C hecking tire pressure .. ... .. .. .. .. . 18 6
C leaning ... .. .... .... ... .. .. .. ... 156
Cold tire inflat ion pressure . .. .. .. .. . 184
General notes . . . . . . . . . . . . . . . . . . . . . 180
Glossary of tire and load ing termino lo-
gy ...... ...................... .. 181
New tires and wheels ...... .. .. .. .. . 19 1
Tires and vehicle load lim its ......... 188
When must the airbag system be inspect-
ed? ... .... .. .. ............. .. .. ... 118
When shou ld I ad ju st the tire p ressu res? 187
When should I check the tire pressures? . 187
Where can I find the tire pressures for my
car? ...... .. ................. .. ... 186
W hy safety belts? . . . . . . . . . . . . . . 100, 10 1
W ind deflector ............. ...... ... 44
C lea ning ......................... 156
W indows
C leaning/remov ing ice .............. 156
Conven ience close/open feature ... .. .. 40
Defrost .. ...................... ... 70
W indshield was he r fl uid . ... .. .. .. .. .. 20
Inde x 239
Windshie ld wipers
Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Fo lding up . ... .. .. . .. ... .... ... .. . 57
Rep lacing windsh ield wiper b lades .. .. . 57
Serv ice position . . . . . . . . . . . . . . . . . . . . 56
Washer fluid reservo ir ............. . 179
Winter operation Battery ... .. .. .. .. .. .. ...... ... .. 175
Car washes . . . . . . . . . . . . . . . . . . . . . . . 154
Cooling system . . . . . . . . . . . . . . . . . . . . 171
Defrost ing windows . ................ 70
Heated seats (cl imate control) ..... .. . 71
Removing ice from windows ......... 156
T ires ....... .. .. ................. 146
Winter tires . .. .. .. ................. 195
All-wheel drive .... ................ 195
Wiper and washer system ..... ... .. .. . 54
Intermittent wiping . . . . . . . . . . . . . . . . . 54
One-tap wiping . .. .... ............. . 54
X
Xenon-Lights . ....... . .. .. ..... ... .. 215
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