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__ C _h _e_ c_ k_i_ n -= g ,.,__ a_n _d _ f_i _ l_ l i_ n_, g :,_ __________________________________________
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Engine
cooling
system
Coolant
The engine coolant performs two functions: it keeps the
engine from overheat ing and it prote cts the engine from
free zing in the winter .
The cooling system is sealed and genera lly requ ires little attention .
The cooling system has been fi lled at the factory w it h a permanent
coo lant which does not need to be changed. The coolant consists of a
mixture of water and the man ufacturer's glycol-basedcoo lant add i-
tive Gl2++ a nt ifreeze with ant i corrosion additives (50% for USA
mode ls; 60% for Canadian mode ls). This mixture bot h assures the
necessary frost protec t ion and protects metal components in the
engine's cooling system from corrosion and scaling . It a lso ra ises the
boiling point of the coolant.
Do not reduce the concentration of the coolant in the summer by
adding plain water . The proport ion of coolant additive must be at
least 50 % but not more than 60 % to maintain ant ifreeze protection
and coo ling efficiency. If the coolant frost protect ion is too low, the
coo lant could freeze and damage the veh icle heating and eng ine
cooling system .
For year-ro und d riving, antifreeze is added at t he factory for t emper-
atures down to:
•
- 31°F( -3 5°C)USA
•
- 40 °F ( - 40 °C) Canada .
You can mix the G12 ++ coo lant additive with other add it ives (G12 + or
G12) . Always check with yo ur a utho rized Audi dea ler .
&
WARNING
Before you check anything in the engine compartment, always
read and heed all WARNINGS=>
&
in "Working in the engine
compartment " on
page
203.
0
Note
•
Before winter sets in, have the coolant checked to see if the
coo lant additive in you r vehicle is sufficient to meet the climate
condi t ions. This is especially important if you live in a region where
the winter is extreme ly cold. If necessary, increase the proport ion of
coo lan t add it ive t o 60%.
• When adding coolant additive to your cooling system, remember:
- We recommend using only coo lant add it ive G12++ (check the
label) for your vehicle . This coolant additive is available at autho-
rized Aud i deale rs. Othe r ty pes of antifreeze can s ignifica ntly
reduce corrosion protection. The resulting corrosion can cause a
loss of coolant and serious engine damage .
•
Do not add any type of radiator leak sealant to you r vehicle's
eng ine coolant. Adding rad iator repair fl uid may adversely affect the
function and performa nce of your coo ling system and could resu lt in
da mage not covered by your New Vehicle Limited War ranty. •
Checking
the engine
coolant
level
The engine coolant level can be checked with a quick
glance .
Fig. 140 Engine
compa rtm ent: coola nt
expansio n t ank
..
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