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 factory
with a permanent coolant which does not need to
be changed . The coolant consists of a mixture of
specially condit ioned water and the manufactur -
er's glycol-based coolant additive Gl3 antifreeze
with anticorrosion additives (SO% for USA mod-
els; 60% for Canadian mode ls). This mixture
both assures the necessa ry frost protection and
protects metal components in the engine's cool-
ing system from corrosion and scaling .
It also
raises the boiling point of the coolant.
Do not reduce the concent ration of the coolant in
the summer by adding plain water.
The propor-
tion of coolant addit ive must be at least 50 %
but not more than 6 0 %
to mainta in antifreeze
protection and cooling efficiency. If the coolant
frost protection is too low, the coolant could
freeze and damage the vehicle heating and en-
gine cooling system .
For year-round driving, antifree ze is added at the
factory for temperatures down to :
- - 31° F ( - 3S°C)USA
- - 40 °F ( - 40 °C) Canada.
If you must add coolant, use a mixture of water
and coolant addit ive. Mixing the coolant additive
with distilled water is recommended .
_& WARNING
Before you check anythi ng in the engine com-
partment, always read and heed all WARN-
INGS
¢ .&.in Working in the engine compart-
ment on page 220 .
(D Note
- Before winter sets in, have the coolant
checked to see if the coolant additive in your
vehicle is sufficient to meet the climate con-
Ch e ck ing an d Filling
ditions. This is especially important if you
live in a region where the winter is extreme-
ly cold. If necessary, increase the proportion
of coolant additive to 60%.
- When adding coolant additive to your cool-
ing system, remember :
- We recommend using only coolant add i-
tive Gl2+ + or Gl3 for your vehicle. This
coolant addit ive is availab le at aut horized
Audi dealers . Ot her types of antifree ze can
significantly reduce corrosion protect ion.
The resulting corrosion can cause a loss of
coolant and serious engine damage.
- Do not add any type of radiator leak sealant
to your vehicle's engine coolant. Adding ra-
diator repair fluid may adversely affect the
function and performance of your cooling
system and could resu lt in damage not cov-
ered by your New Vehicle Limited Warra nty.
Checking the engine coolant level
The engine coolant level can be checked with a
quick glance.
Fig. 201 Engin e com par t men t : cover on t he coo lant expan -
sion ta nk
Before you check anything in the engine compart-
ment,
always read and heed all WARNINGS
¢ A in Working in the engine compartment on
page 220 .
Park your vehicle on a level surface .
.,. Switch off the ignition.
.,. Read the engine coolant level from the coolant
expansion tank
¢ fig. 201, ¢ page 222. With a
cold engine, the coolant level should be be-
tween the "min" and "max" markings. When .,.
227
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