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Cooling
system
Coolant
The engine cooling system is filled with a mixture
of pur ified water and coolant additive at the fac-
tory. This coo lan t must not be not changed.
The coolant level is monitored through the .
in-
dicator light
¢ page
26. However , we do recom-
mend occasionally check ing the coo la nt level
manually.
If you must add coolant, use a m ixture of water
and coolant addit ive. Mixing the coolant additive
with distilled water is recommended.
Coolant additive
The coolant additive is made of anti-freez ing and
corros ion protection agents. Only use the follow-
ing coolant addit ives . These additives may be
mixed with each other.
Coolant additive
Specification
G13
TL 774
J
G12++
TL 774 G
The amount of coo lant add itive that needs to be
mixed with water depends on the climate where
the vehicle will be operated. If the coolant addi-
tive percentage
is too low, the coolant can freeze
and damage the engine.
Coolant
Freeze protec-
additive
tion
Warm
min. 40%
m in. -13 °F
regions
max. 45%
(-25 °C)
Cold
min. 50%
max . -40 °F
regions
max. 55%
(-40 °C)
(D
Note
- Before the start of winter, have your author-
ized Audi dealer or authorized Audi Service
Facility check if the coolant additive in your
vehicle matches the percentage
appropriate
for the climate . This is especially important
when driving in colder climates .
- If the appropriate
coolant additive is not
available in an emergency, do not add any
other additive . You could damage the en-
Checking
and Filling
gine. If this happens, only use water and re -
store the correct mixture ratio with the
specified coolant add it ive as soon as possi-
ble.
- Only refill with new coolant .
- Radiator sealant must not be mixed with
the coolant.
Adding coolant
Fig. 198 Engine compartment:
coo lant expansio n ta nk
cover
Checking the engine coolant level
.,. Park your vehicle on a level surface.
.,. Switch the ignit ion off.
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.,. Read the coolant level on the coolant expansion
tank
¢ page
219,
fig.
196.
The coolant level
must be between the MIN and MAX mark ings
when the engine in cold . When the engine is
warm it can be slightly above the MAX marking.
Adding coolant
Requirement: there must be a residual amount of
coolant in the expansion tank
¢ (D.
.,. Let the engine cool down.
.,. Place a cloth over the coolant expansion tank
cap and unscrew the cap counterclockw ise
¢ _&.
.,. Add coo lant mixed in the correct rat io
¢ page
223
up to the MAX marking .
.,. Make sure that the fluid leve l remains stable.
Add more coolant if necessary .
.,. Close the cap securely.
Coolant loss usually indicates there is a lea k. Im-
mediately dr ive your vehicle to an authorized
Audi dealer or authorized Audi Service Facility
and have the cooling system inspected. If the
223
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