Engine cooling system
Coolant
The engine coolant performs two functions: it
keeps the engine from overheating and it pro-
te cts 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 coolan t additive G12++ ant ifreeze
with a nticorrosion add itives (SO% fo r USA
models; 60% for Canad ian models). This mix-
ture bot h assu res t he ne ces sary frost protec-
tion and protects metal components in the
engine's cooling system from corrosion and
scaling. It also raises the boiling po int of t he
coolant.
Do not red uce t he concentration of the coo l-
ant in the summe r by adding plain water .
The
proportion of coolant addit ive must be at
least 50% but not mo re than 60 % to ma in-
tain antifree ze protection and cooling efficien-
cy. If the coolant frost protect ion is too low,
the coolant could freeze and damage the veh i-
cle heating and eng ine cooling system .
For year-round driving, antifree ze is added at
the factory for temperatures down to:
- - 3 1 °F ( - 3 S°C) USA
- - 4 0°F ( - 4 0°C) Canada.
You ca n mix t he G12 ++ cool a nt ad d itive with
ot her addit ives (G12+ or G12). Always che ck
wit h your author ized Audi dealer.
& WARNING
Before you check any t hing in the engine
compartment, always read and hee d a ll
WARNINGS c:> .&. in Working in the engine
compartment on page 232.
(D Note
- Before wint er se t s in, have t he coolan t
checked to see if the coolant addit ive 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 reg ion where t he win-
ter is extreme ly cold. If necessary, in-
crease t he propo rtion of coo lant add itive
t o 60% .
- Whe n add ing coolant additive to your
cooling system , remember :
- We re comme nd usin g o nly cool a nt ad-
dit ive G12++ (check t he labe l) for your
vehi cle . This coolan t addi t ive is availa-
ble at a uthorized Audi dea lers. Othe r
types of ant ifreeze can significant ly re-
d uce corrosi on protection. The res ult-
ing corrosion can cause a loss of cool-
ant and ser ious eng ine damage .
- Do not add any type of rad iator leak seal-
ant to you r vehicle's eng ine coolant .
Adding radiator repair fl uid may adverse-
ly affect t he function and performance of
your cooling syst em and could resu lt in
damage not covered by yo ur New Vehicle
Limit ed War ran t y.
Checking the engine coolant level
The engine coolant level can be checked with
a quick glan ce.
Fig. 210 Engine compartment: Coolant expansion tank
Before you check a nyt hing in the eng ine com -
partment, always read and heed all WARN-
INGS c:> & in Working in the engine compart-
ment on page 232 .
.. Turn off the ignition .
.. Read the engine coolant level f rom the coo l-
ant expansion tank
c:>fig. 210. Wit h a cold
eng ine, the coo lant level shou ld be between
the "MIN" a nd "MAX" markings. When the .,..
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