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-
qu ires 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-based coolant additive G12++ antifreeze
with anticorrosion add itives (SO% for USA
models; 60% for Canadian models). This mix-
ture both assures t he necessary frost protec-
tion and protects metal components in the
engine's coo ling system from corrosion and
scaling. It also raises the boiling point of the
coolant.
Do not reduce the concentration of the coo l-
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 antifree ze 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, antifree ze is added at
the factory for temperatures down to:
- - 31 °F ( - 3 S°C) USA
- - 40°F ( - 40°C) Canada.
You can mix the G12 ++ coolant additive with
other addit ives (G12+ or G12). Always check
with your authorized Audi dealer.
& WARNING
Before you check anything in the engine
compartment, always read and heed all
WARNINGS ¢ .&.in Working in the engine
compartment on page 232.
(D Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in
Checkin g and fillin g 239
your vehicle is sufficient to meet the cli-
mate conditions. This is especia lly 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 using on ly coolant ad-
ditive G12 ++ (check the labe l) for your
vehicle . This coolant additive is availa-
ble at a uthorized Audi dea lers . Other
types of antifreeze can significant ly re-
duce corrosion protection. The result-
ing corrosion can cause a loss of cool-
ant and serious eng ine damage.
- Do not add any type of radiator 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
The engine coolant level can be checked with
a quick glance.
Fig. 204 Engine compartment: Coolant expansion tank
.,. Before you check anything in the engine
compartment, always read and heed all
WARNINGS ¢ .&. in Working in the engine
compartment on page 232.
.. Turn off the ignition .
.. Read the engine coolant level from the
coo lant expansion tank ¢
fig. 204 . With a
cold engine, the coolant level should be be-
tween the "MIN" and "MAX" markings .
~
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