Checking and Filling
marking and the edge of the filler opening
(MAX) on the coolant expansion tank
ðfig. 164. When the engine is warm, the float
can also be slightly above MAX.
If the coolant level is correct, turn the cap to
the right to tighten it until you feel resistance a
second time, and then reinstall the cover below
the windshield wiper.
If you must add coolant, use a mixture of water
and coolant additive. Audi recommends mixing
the coolant additive with distilled water.
Requirement for adding coolant: there must be
a residual amount of coolant in the expansion
Note
Coolant loss that results in the coolant expan-
sion tank becoming nearly empty primarily in-
dicates that there are significant leaks in the
cooling system, which can lead to further
damage.
►
– Do not add coolant if the expansion tank is
empty. Air could enter the cooling system
and increase the risk of damage. If this is
the case, do not continue driving. See an au-
thorized Audi dealer or authorized Audi
Service Facility for assistance.
►
►
►
– If there is any coolant remaining, add addi-
tional coolant. Drive to an authorized Audi
dealer or authorized Audi Service Facility
immediately to have the malfunction cor-
rected. If the indicator light turns on
again, do not continue driving and turn off
the ignition. See an authorized Audi dealer
or authorized Audi Service Facility for assis-
tance.
tank ð
.
Add coolant in the correct mixture ratio
ðpage 245 until the float is positioned at the
edge of the filler opening on the coolant expan-
sion tank (= MAX) ðfig. 164.
Make sure that the fluid level remains stable.
Add more coolant if necessary.
Turn the cap to the right to tighten it until you
feel resistance a second time, and then rein-
stall the cover below the windshield wiper.
►
►
– If there is too much coolant in the expan-
sion tank after adding coolant, drive to an
authorized Audi dealer or authorized Audi
Service Facility as soon as possible to have
the coolant level corrected.
WARNING
– The engine/motor compartment in any vehi-
cle is a potentially dangerous area. Shut off
the engine, turn off the ignition, and allow
the engine to cool before working in the en-
gine compartment. Always follow the infor-
mation found in ðpage 237, General infor-
mation.
– Using non-distilled water increases the risk
of engine damage. Its chemical components
may cause significant corrosion damage in
the engine.
– If you had to add a large amount of non-dis-
tilled water (more than 0.5 liter), then im-
mediately drive to an authorized Audi dealer
or authorized Audi Service Facility to have
the coolant changed.
– Never open the hood if you can see or hear
steam or coolant escaping from the engine
compartment. This increases the risk of
burns. The cooling system is under pressure.
When you no longer see or hear steam or
coolant escaping, you may open the engine
compartment with caution.
Brake fluid
– When working in the engine compartment,
remember that the radiator fan can turn on
even if the ignition is turned off, which in-
creases the risk of injury.
– Coolant additive and coolant can be danger-
ous to your health. For this reason, store the
coolant in the original container and away
from children. There is a risk of poisoning.
Fig. 165 Engine compartment: cap on brake fluid reservoir
247
English 
