Note
♦
The chemical materials (stop leak additive) for sealing leaks
in the refrigerant circuit offered on the market are not approved
by Audi AG. There are no permanent- ,validity or material
compatibility tests. Therefore damage or malfunctions in the
A/C system or the A/C Service Station cannot be excluded.
♦
The stop leak additives offered on the open market have dif‐
ferent physical and chemical properties, which can impair the
function of the A/C system and the A/C Service Station and
can even shut down the system completely.
♦
Audi does not approve the use of chemicals to seal leaks in
the refrigerant circuit (leak stop additives).
♦
Chemical materials to seal leaks in the refrigerant circuit react
with air or the moisture in the air and form deposits in the re‐
frigerant circuit and the A/C service station that lead to mal‐
functions in the valves and other components that come into
contact with such chemicals. These deposits cannot be re‐
moved completely from the components, even by flushing.
♦
It is not possible to recognize chemical substances to seal
leaks in the refrigerant circuit (leak stop additive) and the label
that is supposed to come with them is usually not there. There‐
fore be careful when working with if you do not know its service
history.
♦
Accessories offer containers used to separate out these
chemicals (used to seal leaks in the refrigerant circuit). Since
Audi does not know composition and the physical and chem‐
ical properties of these materials, it is not possible to make a
statement about their effectiveness and the deposition rate of
these filters.
♦
The Filter for sealants -VAS 6592- offers a certain protection
for the A/C service station. This filter is incorporated between
the A/C service station and the Service connection on the low
pressure side of the refrigerant circuit in a vehicle (the A/C
service station may not be connection to the service connec‐
tion of the high pressure side of the refrigerant circuit for
draining, evacuating and measuring). This filter separate cer‐
tain materials that were added to seal leaks in the refrigerant
circuit. It prevents these materials from getting into the refrig‐
erant and refrigerant oil in the A/C service station unchecked
and doing damage. For the protection to work, it is necessary
that the filter be changed in regular intervals and exactly ac‐
cording to the manufacturer specifications (described in the
instructions provided). Audi does not support using chemical
materials (stop leak additives) for sealing leaks in the refrig‐
erant circuit. There are many different formulas of these chem‐
icals (stop leak additives), that are offered as “sealant for
refrigerant circuits“ and it is not possible to make a statement
about the effectiveness of the Filter for sealants -VAS 6592- .
If the refrigerant circuit gets filed with a chemical material (stop
leak additive) to seal any leaks (or if there is a suspicion of this)
and if it then necessary to perform a repair to the refrigerant cir‐
cuit, then it is necessary to inform the customer of the following:
♦ It is not possible to evacuate the refrigerant from the A/C sys‐
tem due to the stop leak additive that has been added to the
system because it will damage the A/C Service Station. It will
necessary to hire an outside company the can evacuate the
contaminated refrigerant with a suitable device and then dis‐
pose of it (for example, a local waste management company
that specializes in disposing of refrigerant).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
2. Description and Operation 81
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