radiator cap AUDI TT ROADSTER 2015 Owners Manual

Instrument s and warnin g/indic ator ligh ts 17
-L Engine cooling system
A malfunction in the engine cooling system
must be repaired as soon as possible.
When the. symbol in the display flashes,
then either the eng ine coolant
temperature is
too high, or the coolant
level is too low . In ad ­
d ition to the symbol, the following message
a lso appears in the display:
S witc h off engin e and ch eck c ool ant l evel
~ Pull off the road and stop the vehicle.
~ Turnoff the engine.
~ Check coolant level ¢ page 172.
~ Add coolant if necessary¢ page 172.
~ Conti nue driving only after the eng ine cool ­
ant warn ing/ indicator l ight goes out .
~ Contact you r authorized Audi dea le r fo r as-
s istance if necessary.
If the engine coolant level is correct, then the radiator fan may be the cause of the malf unc­
tion .
If the generator warning/ind icator light
should also illuminate¢
page 16, then the
fan belt may be damaged .
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
¢ page 51, Emergency
flasher.
-
- 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 coo lant escaping.
- The engine compartment of any veh icle
is a dangerous area. Before you perform
any work in the engine compartment,
turn
off the engi ne and allow it to cool.
Follow the wa rning sticke rs.
(D Note
Do not continue driving if the. symbo l
illuminates . There is a malfunct ion in the engine cooling system
-you could damage
your engine.
~ Electro-mechanical power assist
If the indicator light i lluminates while you are
driv ing, there is a malfunction in the electro­
mechan ica l steer ing. If the indicator light is
showing £~ ). there may be a reduction in pow ­
er steeri ng assist . If the indicator light is
showing ., there may be a total loss of pow­
er steeri ng assist. The steer ing must be in ­
spected immed iately by a qualified wo rkshop
Q & . With the engine not running (e.g. when
the car is being towed), there is a lso no power
assist available .
A WARNING
-
If there is a malf u nction, the indicator
light for the electro-mechanical power as­
sist illuminates. Seek professional assis­
tance.
~ Convertible top
The warning/indicator light monitors the con­
vertible top function.
The l!1 warning/indicator light illuminates
when you switch on the ignition for about 2
seconds as a check and then goes out. The
warning/indicator light has the following
funct ions:
- The light illuminates when the folding top opens or closes.
- It flashes if one of the conditions for auto­
matically lowering or ra is ing the convertible
top is not met and the switch to actuate the
convert ible top is pressed.
- The light illuminates when the convert ible
top is opened or closed
incompletely.
!;.! ~ Electronic Stabilization Control
(ESC)
If the GJ ind icator lamp b lin ks wh ile d riving,
the ESC or ASR (Anti-Slip Reg ulation) is active-
ly reg ulating .
IJI,-

-Apply the parking brake.
- Move selector lever to "P" (Park).
- Always let the engine cool down. Hot
components will burn skin on contact.
- To reduce the risk of being burned, never
open the hood if you see or hear steam
or coolant escaping from the engine
compartment. Wa it 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:
Checking and filling 165
- First, fully apply the parking brake,
move selector lever to "P" (Park) .
- 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 wear no clothing that will hang or droop into the engine.
- Minimize exposure to emission and
chemical hazards~&. .
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.
Q) 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. •
•

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. •
•

F
Fan ... .. .. .. .. .... .. .... ... .. .. .... 68
Radiator ... .. ... .. ..... ... .. .. ... 173
F astening
Booste r seats ............ .. .. .. .. . 136
Conve rtible c hild s afety sea ts . .. .. .. . 134
I nfant sea ts
Flat t ire 134
Changing .. .. .............. ... ... 208
F loor mats . . . . . . . . . . . . . . . . . . . . . . . . . . 96
F og lights . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Foldi ng master key w it h remote contro l . . 32
F oot pedals . . . . . . . . . . . . . . . . . . . . . . . . . 96
F or the sake of the environmen t
Gasoline fumes and the environment . . 16 2
L e tt ing yo ur engine warm up ... .. .. .. 73
Refueli ng .. .. .. .. .. .... ... .. .. ... 162
Saving fue l by early upshifting . ... .. .. 1 0
Fr ont airbags
D escr ipt io n ... .. ......... .. .. .. ... 1 12
H ow they work . .. ..... ... .. .. .. .. . 11 7
Fronta l co llisions and the laws of physics 10 1
Front seats . . . . . . . . . . . . . . . . . . . . . . . . . 59
Adjusting .. ............. .... .. .... 93
Adjusting the manual seats . .. .. .. .. .. 60
Ch ild restra ints in the front seat ... .. . 109
Fu el
Additives ... .. .. .. .. .... ... .. .. ... 160
Blended gasoline ......... .. .. .. .. . 160
Current fuel mileage . . . . . . . . . . . . . . . . 23
F iller neck ................ ... ... .. 161
Fuel gauge . . . . . . . . . . . . . . . . . . . . . . . . 12
Fue l supp ly too low . . . . . . . . . . . . . . . . . 20
Gasoline . .. .. .. ......... .. .. .. ... 160
Gasoline additives ........ .. .. .. .. . 16 1
Octane rating ............ .. .. .. .. . 160
Recommenda tion . ..... ... .. .. .. .. . 160
Refue lling . ... .... .. .... ... .. .. ... 162
Reserve .... .. .. .. .. .... ... .. .. .... 1 2
Tank capacity . ........... .. .. .. .. . 223
Unlock ing the fue l filler f lap by ha nd . . 163
F ue l economy messages (eff iciency pro -
g ram) ..... .. .. .. .. .. .... ... .. .. .... 27
F use arrangement ......... .. .. .. .. . 213
Inde x 233
G
Garage door opener ( Home link) ... .. .. . 88
Gas d ischarge lamps .. . .. .. .. ... ... .. 215
Ga uges
Engine coolant temperature . . . . . . . . . . 11
Fuel gauge . . . . . . . . . . . . . . . . . . . . . . . . 12
Tachometer . . . . . . . . . . . . . . . . . . . . . . . 10
General i llustration
Instruments and controls .... ... .. .. .. 8
Generator (warning/ indicator ligh ts) . .. . 16
G lossary of tire and loading term inology 181
G love compartme nt . . . . . . . . . . . . . . . . . . 65
G ross Vehicle We ight Rating (GVWR) ... 222
H
Head lights ....... .. ..... ........... 48
adaptive light .. .. .. . .. .... .... .. .. . 49
Cleaning .. .. .... ... .. ... ... .... .. 155
defective . . . . . . . . . . . . . . . . . . . . . . . . . . 20
F ron t fog lights . . . . . . . . . . . . . . . . . . . . 50
Switching off . ..... . .. .. ..... ... .. . 48
Switching on ... .... . ... ...... ... .. . 48
Washer system . . . . . . . . . . . . . . . . . . . . . SS
Xenon headlights . .. ........... .... . 48
Hea d restr aints .. .... ... .......... .. . 94
Adjus ting ... .... .. . .. .. ..... ... .. . 94
Heated exter io r mir ro rs . . . . . . . . . . . . . . . . . . . . 52
fron t seats ( climate co ntrol) ..... .. .. . 71
re ar w indow ..................... .. 70
Heated seats .. .. .. .. . .. .... .... .. .. . 71
Heated washer jets Wiper and washer system .... ... .. .. . 54
Hea ting .... .. .. .. .... ............. . 67
Hig h beam . . . . . . . . . . . . . . . . . . . . . . 48, 50
Hig h voltage warning label .... ... .. .. 222
Hill Descent Assist . .. .. .. ...... .... .. 84
Hill ho ld assist
Start ing on hills .. ................. . 75
Homelin k unive rsal remote con trol . .... 88
Hood Open ing .. .. .. .. .... ............. 164
Re lease leve r .. .. ... ............ .. 164
Hor n .... .. .. .. .. .. ............... .. 8
How many airbags does my vehicle have? 114
•
•