♦ UV-absorbing safety goggles -VAS 6201/6-
♦ Sticker -VAS 6201/7-
♦ Filler tube
VAS 6201/8
♦ Protective Gloves -VAS 6201/9-
Note
♦
Certain leaks cannot or only with difficulty be found using an
electric leak detection unit. Leak detection can be performed
using leak detection system VAS 6201 for determining these
leaks.
♦
Refrigerant and refrigerant oil escape when there is a leak in
the refrigerant circuit. Generally, this oil remains in the vicinity
of the leaking area. A small amount of fluorescent fluid must
be added into refrigerant circuit so that this oil becomes visible
under UV light. This fluid (PAG oil with an additive that lights
up under UV light) is added into the refrigerant circuit and dis‐
tributes itself with the refrigerant oil when the A/C system is
switched on.
♦
A/C system must be operated for a minimum of 60 min. so that
the additive distributes itself in the entire refrigerant circuit
(compressor must be running). Depending on the size of the
leak, it may become visible under UV light within that time.
♦
Refrigerant oil with additive that lights up under UV-light can
be added directly with an open circuit or be pumped into a filled
circuit via service connection on the low pressure side using
hand pump VAS6201/1 (from leak detection system VAS
6201).
♦
If the leak detection additive is added to a filled refrigerant cir‐
cuit via service connection on the low pressure side, a small
amount of leak detection additive remains in the service con‐
nection. Carefully remove this residual amount so a leaking
area is not detected erroneously upon a later leak detection.
♦
If a component in which leak detection additive has been add‐
ed is being replaced on a circuit, always clean connection
areas to other components thoroughly after assembling re‐
frigerant circuit. This residue may be detected erroneously as
leaking areas upon later leak detection.
♦
Refrigerant oil and with it leak detection additive reaches into
service station when evacuating a refrigerant circuit. Refriger‐
ant oil is separated from refrigerant in oil collector of service
station and removed from service station via draining device.
The refrigerant oil drained off must not be poured back in. It
must be replaced with new refrigerant oil.
♦
If leak detection fluid was filled already in a refrigerant circuit
for an earlier repair, note the following: only add new leak de‐
tection additive if the refrigerant oil will be replaced. If only a
portion of refrigerant oil was replaced, only top-off with a cor‐
responding amount of leak detection fluid as well. For exam‐
ple, if 100 ml of refrigerant oil was replaced in a vehicle with
250 ml, add only 1 ml (cm
3
) of leak detection additive.
♦
Certain materials and their connections (for example, oxida‐
tion products on aluminum components, corrosion protection
growth, etc.) also light up under UV-light.
♦
Depending on the version of the A/C Service Station, stop leak
additive can also be added directly at the top. Refer to the
Operating Instructions that come with the A/C Service Station.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
4. Diagnosis and Testing 145
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