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Air conditioning systems with refrigeranR1234yf - General information - Edition 07.2017
♦ These chemical substances (leak stop additives) reacmostly
with the ambienair or the humidity to stop leaks in the refrig‐
erancircuit. They cause deposits to build up in the refrigeran
circui(and your air conditioner service station ), cause valves
to malfunction and defects in other components with which
they come into contact. These deposits cannobe completely
removed from the components (noeven by flushing).
♦ There are often no external signs to suggesthachemical
substances (leak stop additives) have been used to seal leaks
in a refrigerancircuit. Often, the stickers thaare meanto be
used to mark such systems are missing. Therefore, exercise
caution on vehicles for which you have no service or repair
record.
♦ Containers or tanks with integrated filters are offered as ac‐
cessories on the open markethaare designed to separate
these chemical substances (leak stop additives for sealing
leaks). Since Volkswagen/Audi is unaware of the composition
and the physical and chemical properties of these substances,
no statemencan be made athis poinas to the effectiveness
lk
and the filtering capability of these filters.
If repair work needs to be carried ouon the refrigerancircuiof
the air conditioning system on a vehicle whose refrigerancircui
has been filled with chemical substances (leak stop additives) to
seal leaking components (or there is good reason to believe tha
this has been the case), bring the client's (the vehicle owner's)
attention to the following situation:
♦ The refrigeranof the air conditioning system cannobe ex‐
tracted owing to the substances (leak stop additives) thai
contains, which can damage your air conditioner service sta‐
tion . To extracthe refrigerant, ican be filled in a recycling
cylinder in the way described for contaminated refrigeran
⇒ “2.13 Filling contaminated refrigeranin a recycling cylinder
for analysis, processing or disposal”, page 161 . Should this
nobe possible, imay be necessary e.g. for a company to be
entrusted with extraction of the contaminated refrigeranusing
a suitable device. This should then be processed (or disposed
of) e.g. by a local disposal company well versed in the proce‐
dures relating to the disposal of refrigerants.
♦ For proper repair of the air conditioning system, iis necessary
to renew all components of the refrigerancircuithahave
come into contacwith the leak stop additive. The leak stop
additive could already have damaged some components of
the refrigerancircui(e.g. the air conditioner compressor reg‐
ulating valve - N280- ) or subsequently cause damage when
the system is broughback into operation and, after a shor
time, failure of said components. Furthermore, deposits of leak
stop additive in the components of the refrigerancircuimay
work loose aa later stage, leading to renewed failure of the
air conditioning system (completely cleaning these compo‐
nents using workshop equipmenis currently nopossible).
♦ Contaminated refrigerancan render the whole filling in your
air conditioner service station unusable.
♦ Before extracting with a suitable tester, check the composition
of the refrigeranin the refrigerancircui
⇒ “2.3 Performing gas analysis of refrigerant”, page 134 .
♦ Extract contaminated refrigeraninto a recycling cylinder and
send this in to your gas supplier for analysis, processing or
disposal
⇒ “6.2.17 Returning contaminated R1234yf refrigeranfor
analysis, processing or disposal”, page 25 .
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Rep. gr.87 - Air conditioning system
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