2015 AUDI A4 radiator

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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.

292 Index
Starting with jumper cab les . ....... . 274
Stopping . . . . . . . . . . . . . . . . . . . . . . 84, 86
E ng ine compartment
Safety instructions ...... .. .. .. .. .. . 212
Working the engine compartment 212
Eng ine coolant
Indicator light . . . . . . . . . . . . . . . . . . . . . 17
E ngine coolant system ...... .. .. .... . 218
Adding coolant ........... .. .. .. .. . 219
Checking coolant level ..... .. .. .. .. . 218
Check ing the eng ine coolant level .. .. . 218
Radiator fan .............. ... .. .. . 220
E ngine coolant temperature
Temperature gauge ....... .. .. .... .. 10
Engine hood
C losing ......... ......... ... .... . 212
How to release the hood ............ 212
E ng ine oil . .... ........... ........ . 214
Adding .. .. ............. .. .. .. .. . 216
Addit ives ... ................ ..... . 216
Changing . ................. ..... . 217
Check oil level ............ ... .... . 216
Consumption ............ .. .. .. .. . 216
Indicator light . . . . . . . . . . . . . . . . . 17, 21
Oil consumption ............ .. .... . 215
Oil grades .. ................ ... .. . 214
Pressure malfunction ...... .. .. .. .. . . 17
Sensor defective . . . . . . . . . . . . . . . . . . . . 21
Specification and viscos ity .. .. .. .... . 214
Engine speed limitation ......... .... .. 20
Environment Break- in period ............ ... .... . 193
Cata lytic converter ............ .. .. . 194
Disposing of your vehicle battery ..... 225
Driving at high speeds ..... .. .. .. .. . 195
Driving to minimize pollution and noise 195
Fuel ..... .. ..... ........... ... .. . 210
Fuel economy ............. ... .. .. . 195
L eaks under your veh icle . .. .. .. .. .. . 212
L ett ing the vehicle stand and wa rm up . 196
Proper disposal of drained brake fluid . 221
Proper disposal of drained engine coo l-
ant ..... .. ................ ..... . 219
Proper disposal of dra ined engine
oil .. .. .. ................. .. 216,217
Recycling used engine oil ... .. .. .. .. . 216
Roof rack . . . . . . . . . . . . . . . . . . . . . . . . . 70 Unleaded fuel
.... ................ . 207
What shou ld I do with an o ld battery? . 22S
EPC
refer to E lectronic power control . . . . . . 20
Ethyl alcohol (Fuel) . .. .. ...... ... .. .. 208
Event Data Recorder (EDR) ............ 184
Exhaust tail pipes
Cleaning .. .... .. ............. .... 203
Expansion tank .... ............. .... 218
Exterior lighting ... ................ .. 49
Exterior m irrors
Adjust ing . .. .. .. .. ........... .. .. . 52
Dimming .. .... .. ............. ..... 53
Heating . .. .. .. . .............. .. .. . 52
F
Fan
Radiator 220
Fastening Booster seats . . . . . . . . . . . . . . . . . . . . . 173
Convertib le child safety seats .. ... ... 172
Infant seats ... .. ... .......... .... 171
Fa stening eye s
refer to Tie-downs .. .... .... ... .. .. . 74
Flat tire Changing ..... .. ................ . 263
flexib le fue l ....... ............. .... 208
Floor .. .... .... .. ................. . 76
Floor mats . ..... .. ................ . 131
Fog lights/rear fog light(s) ......... ... . 49
Folding the rear seats ............ .... . 71
Foot pedals . .... .. ............. .... 131
For the sake of the environment Gasoline fumes and the env ironment .. 210
Letting the engine warm up . . . . . . 82, 85
Refueling . .. .. .. ... .......... .... 210
Sav ing fuel by early upshifting . .. .. .. . 11
Front airbags Description . . . . . . . . . . . . . . . . . . . . . . . 148
How they work . .. .......... ...... . 153
Frontal collisions and the laws of physics 137
Front passenger's door emergency lock ing 37
Front seats Adjusting ... .. .. ....... ...... .. .. 128
Child restraints in the front seat .. .. .. 145

29 6 Index
Parking system ........... ... .. .... . 118
Rear .. .... ................ ..... . 118
Rear, with rear v iew camera ... .. .... . 120
Park ing system (rear) ................ 118
Ad justing the warning tones .. .. .... . 119
Parking system (rear, w ith rear view cam-
era) Park ing mode 1 ................... 122
Parking mode 2 ................... 123
Safety precautions ................. 120
Switching on/off ............. .... . 121
Switching rear view camera on/off ... . 124
Part it ion net . . . . . . . . . . . . . . . . . . . . 72, 73
Parts replacement .................. 285
Pass-t hrough ............... ... .... .. 75
PASSENGER AIR BAG OFF light ... .. .. . 155
Passive safety system ........... .... . 126
Pedals .. .. .. ................ ... .. . 131
Physical principles of a frontal collision 137
P lastic parts
C leaning ... ................ ..... . 204
Polishing .. .... .............. ...... 204
Pollutant filter (automatic A/C system) .. 78
Power seat adjustment . . . . . . . . . . . . . . . . . . . . 62
Power locking system . . . . . . . . . . . . . . . . . 31
E mergency locking .................. 37
Power windows .................... 42
Rear lid . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Selective unlock feature .... ..... .. .. 36
Settings ... ................ ..... .. 36
Sliding/tilting sunroof ............... 42
Power steering
refer to Electro-mechanical power as-
sist .. ... ................ ... .... . 190
Power window
Conven ience opening/closing . .. .... .. 42
Power windows .............. .. .... .. 42
Child safety locks .............. ..... 42
Malfunct ions ............. .... ..... 43
Pregnant women
Special considerations when wearing a
safety belt ............... ... .. .. . 141
Proper occupant seating positions .... . 127
Proper safety belt pos it ion . . . . . . . . . . . . 140 Proper
seating position
Front passenger .. ................ . 128
Occupants ... .. .. .. .............. . 127
Rear passengers .. ............. .... 129
Protecting ......................... 204
Protective liner . . . . . . . . . . . . . . . . . . . . . . 76
Q
Quartz clock . . . . . . . . . . . . . . . . . . . . . . . . 12
quattro
refer to all-wheel drive .......... ... 190
Question What happens to unbelted occupants? 137
Why safety belts? . . . . . . . . . . . . . . . . . 136
R
Radiator fan .. .. .. ............. .... 220
Rain/light sensor
Headlights ...... ............ .... .. 49
Intermittent (windshield w ipers) ...... 55
Sensor defective . . . . . . . . . . . . . . . . . . . . 22
Reading lights . . . . . . . . . . . . . . . . . . . . . . . 52
Rear door sun shade . . . . . . . . . . . . . . 54, 55
Rear fog lights .. .. ... .... ........ .. . 49
Rear lid Automatic operation ................ 39
Emergency re lease . . . . . . . . . . . . . . 40,
41
Escape handle ... ............. ..... 41
Opening and closing .............. .. 38
Rear light Defective . . . . . . . . . . . . . . . . . . . . . . . . . 21
Rear view camera
Parking mode
1 ................... 122
Parking mode 2 .. ................ . 123
Rear view mirror ................... .. 53
Rear window heating ............ ..... 80
Rear window sun shade . . . . . . . . . . . . . . . 55
Rear window washer system ......... .. 55
Recircu lation mode (automatic climate
control) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Refuell ing ......................... 210
Release lever for hood ............... 212
Remote contro l
Garage door opener (Home link) ...... . 45