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214
Che ck ing and filling
Engine
cooling
system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro -
tects the engine from freezing in the winter .
The cooling system is sealed and generally re-
quires little attention .
The cooling system has been filled at the fac-
tory with a permanent coolant which does not
need to be changed. The coolant consists of a
mixture of water and the manufacturer's
gly-
col-basedcoolant
additive G13 antifreeze with
anticorrosion add itives (50% for USA models;
60% for Canadian models). This mixtu re both
assures the necessary frost protection and
protects metal components in the engine 's
cooling system from corrosion and scaling. It
also raises the boiling point of the coolant .
Do not reduce the concentration of the cool-
ant in the summer by adding plain water . The
proportion of coolant additive must be at
least 50% but not more than 60% to main-
tain antifreeze protection and cooling efficien-
cy. If the coolant frost protection is too low,
the coolant could freeze and damage the vehi-
cle heating and eng ine cooling system .
For year-round driving, antifreeze is added at
the factory for temperatures
down to:
- - 31 ° F ( - 3 S °C) USA
- - 40 °F ( - 40 °C) Canada .
_&.
WARNING
Before yo u check anything in the engine
compartment,
always read and heed all
WARNINGS ~
A
in Working in the engine
compartment on page 207.
(D
Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in
your vehicle is sufficient to meet the cli-
mate conditions . This is especially impor-
tant if you live in a region where the win-
ter is extremely cold. If necessary, in-
crease the proportion of coolant additive
to 60%.
- When adding coolant additive to your
cooling system, remember:
- We recommend us ing on ly coolant ad-
ditive G12++ or G13 for your vehicle.
This coolant additive is availab le at au-
thor ized Audi dealers. Other types of
antifreeze can s ignificantly reduce cor-
rosion protection. The resulting corro-
sion cah cause a loss of coolant and se-
rious engine damage.
- Do not add any type of rad iator leak seal-
ant to your vehicle's engine coolant .
Adding radiator repair fluid may adverse-
ly affect the function and performance of
your cooling system and could result in
damage not covered by your New Vehicle
Limited Warranty.
· Checking the engine coolant level and
adding coolant
Be very careful when adding engine coolant.
Fig. 180
Engine compart m ent: Cover on the coo la nt
expansio n t an k
Fig. 181
Engine compart m ent: markings in t he coolant
expansion tank
ll>
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