cooling AUDI A4 2015 User Guide

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level should be between the "MIN" and
"MAX" markings. When the engine is warm,
the level may be slightly above the "MAX"
marking .
The location of the coolant expansion tank
can be seen in the engine compartment illus­
tration
<=> page 214.
To obtain an accurate reading , the engine
must be switched
off.
The expansion 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 <=>
page 17 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 rec­
ommend 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 coolant loss, the cool­
ing system should be inspected immediately
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.
A WARNING
The cooling system is under 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
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 ap­
plying light, downward pressure on the
top of the cap .
- To avoid being burned, do not spill anti­
freeze or coolant on the exhaust system
Checking and filling 219
or hot engine parts. Under certain condi­
tions, the ethylene glycol in engine cool­
ant can catch fire.
([) Note
Do not add any type of radiator leak seal­
ant to your vehicle's engine coolant. Add- ing radiator repair fluid may adversely af­
fect the function 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 com­
partment ,
always read and heed all WARN­
INGS <=>
A in Working in the engine compart­
ment on page 212 .
Requirement: There must be a residual
amount of coolant in the expansion tank <=>(D.
.,. Turn
off the engine.
.,. Let the engine cool down.
.,. Place a thick rag over the coolant expansion
tank
<=> page 218, fig . 185 and carefully turn
the cap counter-clockwise
<=> .&_ .
.,. Add coolant mixed in the correct ratio
<=> page 218, Coolant up to the MAX mark­
ing.
.,. Make sure that the fluid level remains sta-
ble. Add more coolant if necessary.
.,. Twist the cap on again
tightly.
Replacement engine coolant must conform to
exact specifications <=>
page 218, Coolant.
We recommend using only coolant additive
G12 ++, G13 or in an emergency G12 +. Do
not
use a different additive. In an emergency use
plain water until you can get the correct addi­
tive 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 . .,.
•
•

220 Check ing and filling
Do not fill coolant above the "MAX" mark. Ex­
cess coolant will be forced out through the pressure re lief valve in the cap when the en ­
g ine becomes hot.
A WARNING
- The coo ling 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 a llow 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 co unte r-clockwise d irection while
apply ing light, downward press ure on
the top of the cap.
- To avoid being burned, do not spi ll an­
tifreeze or coolant on the exhaust sys­
tem or hot engine parts. Under certa in
conditions, the ethylene glyco l in en­
g ine coolant can ca tch f ire.
- Antifreeze is poisonous. Always store an­
t ifreeze in its original container and we ll
o ut of the reac h of children.
- If you drain the coolant, it must be
caught and safely stored in a p roper con­
ta iner clear ly ma rked "poison".
(D Note
- Do not add coolant if the expansion tan k
i s empty. A ir could enter the cooling sys­
tem and damage the eng ine. If this is
the case, do not continue driving. Seek professional assistance.
- Coolant po llutes the e nv ironment and
could cause an engine fire. Excess coo l­
ant will be forced ou t through the pres ­
su re rel ief v alve in the ca p when the en­
gine becomes hot .
- If, in an emergen cy, only water can be
added, the correct ratio be twee n wa te r
and antifr eeze¢
page 218 must be re ­
stored as soon as possib le .
{® For the sake of the environment
D rained coo lant should not be reused . A l­
ways d ispose of used coolant whi le observ­
i ng a ll environmental regulations.
Radiator fan
The radiator fan switches on automatically by
itself
T he rad iator fan is driven by the engine v ia the
V-belt. The viscous clutch regulates the spee d
of the fan acco rding to the temperature of the
coolant.
An a uxiliary electric radiator fan* sw itches on
and
off depending on coolant temperature
and othe r vehicle ope rat ing condit ions .
A ft er yo u sw itch the eng ine
off, the aux iliary
f an can continue running for up to 10 m inutes
- even wit h the ignition
off. It can even switc h
on again later by itself¢.&. , if
- t he temper ature of the engine coo lant rises
due to the heat 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 perso na l inj ury nev -
er touch the radiator fan.
- The a uxiliary electric fan is tempe rat ure
contro lled and can sw itch on sud denly
even when the engine is not running.
- The a uxiliary radiator fan switches on a u­
tomatically when the engine coo lant
reac hes a certa in temperature and will
continue to ru n until the coolant temper­
ature drops.

29 0 Index
Child restra ints
D ang er of using child restraints in th e
front seat . . . . . . . . . . . . . . . . . . . . . . . . 145
Where can I get addit ional information
about child restra ints and their use? . . 183
C hild restraint system anchors ..... .. . 179
Ch ild safety .. ................ ... ... 165
Conve rtible locking retracto r .. .. ..... 175
I mportant safety instructions fo r using
ch ild safety seats ....... .. .. .. .. .. . 168
I mportant things to know when driving
with chi ldren .. .. ..... ... .. .. .... . 165
Installing a child restraint us ing the
LATCH system . . . . . . . . . . . . . . . . . . . . . 180
Lower anchorages .......... .. .... . 180
Mount ing and releasing the anchorage
hook .. .... .......... ...... ... .. . 180
Tether anchors ............... .. ... 181
Tether st raps .......... .. .. .. .. .. . 18 1
Ch ild safety locks
Power windows . ..... .... .. .. .. .. .. 42
Rear doors . .............. ... .. .. .. 41
C hild safety seats .. ..... ... .. .. .... . 17 1
Booster se ats . . . . . . . . . . . . . . . . . . . . . 173
Convertible c hild seats .... .. .. .... . 172
Convertible locking retracto r .. .. ..... 175
Danger of us ing c hild restra ints in the
front seat . . . . . . . . . . . . . . . . . . . . . . . . 145
H ow do I proper ly install a child safety
seat in my vehicle? ...... .. .. .. .. .. . 168
I nfant sea ts ............. .. .. .. .. . 17 1
I ns tall ing . . . . . . . . . . . . . . . . . . . . . . . . 17 5
LATCH system .. .. ..... ... .. .. .... . 180
Safety instructions ..... ... .. .. .... . 168
Unused safety belts on the rear seat . . 170
C igare tte lig hte r . . . . . . . . . . . . . . . . . . . . . 65
C leaning .. .. ................ ... .. .
202
Climate controls . . . . . . . . . . . . . . . . . . . . . 78
C lima te con trol system
Automat ic recircula tion .... .. .. .. .. . . 81
Supp lementary hea ter ... .. .. .. .... . . 81
synchronizing .. . ...... ... .. .. .... .. 81
C lock ....... .......... ...... ... .. .. 12
C losing
Power windows .......... .. .. .... .. 42
Sliding/tilting sunroof ...... ..... .. .. 43
Sunshade .. ................ ... ... . 43 Closing/opening
at the lock cylinder . . . . . . . . . . . . . . . . . . 3 7
by remote control . . . . . . . . . . . . . . . . . . 34
with the centra l locking switch ... .... . 3S
with the conven ience key ........ .... . 35
Co ld tire infla tion pressure ..... ... .. .. 234
Coming home . . . . . . . . . . . . . . . . . . . . . . . 50
Compact spare ti re . ............. .... 260
also refer to Spare tire .......... .. .. 260
Compartments . . . . . . . . . . . . . . . . . . . . . . 68
Compass in the m irror ... .. ... ..... .. . 58
Compliance ..... .. .. ... ..... ... .. .. 286
Consumer Informa tio n . . . . . . . . . . 134, 283
Contacting NHTSA . ... .......... .. .. 134
Controls Cleaning . ..... .. .. ... ..... ... .. .. 204
Convenience key Indi cator lights .. ... .......... .. .. . 86
Star ting engine (S TART E NGIN E STOP
button) ... .... .. ... .. ..... ... .. .. . 85
Stopping the engine (START ENGINE
STOP button) . . . . . . . . . . . . . . . . . . . . . . 86
Switching on ignition ........... .... . 85
unlocking/lock ing ............. .... . 35
Convenience opening/clos ing ... .. .. .. . 42
Convertib le child safe ty seats ........ . 172
Convertib le locking retractor
Activating . .. .. .. ............. .. .. 177
Deact ivat ing ... .. ... .... ...... .... 178
U sing to secure a child safety seat 1.75, 177
Coolant system .... .. ... ..... ... .. .. 218
Cooling mode (automat ic climate co ntrol) 79
Cooling System Expansion tank . .. .......... ...... . 218
Cornering light .... .. .... .... ... .. .. . 49
Cru ise cont ro l
Changi ng speed .. ............. .. .. . 91
Presett ing you r speed .......... .... . 92
Switching off .... .. ... ..... ... .. .. . 92
Switching on ..... ... .. ..... ... .. .. . 91
Cruisi ng range ... .. ............. .... . 24
( u pholder .. .... .. ............. .... . 67
D
Data recorder . . . . . . . . . . . . . . . . . . . . . . 184
Date d isp lay .... .. ............. .... . 12