Audi 100 1991 Repair Manual page 41

Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Note
Perform flushing procedure according to operating instruc‐
♦
tions of the A/C service station.
Depending on version of A/C service station, old oil container
♦
holds only approximately 125 cm
a system with a larger quantity of refrigerant oil must be flush‐
ed, it may be necessary to drain the old oil container after the
first flushing process of one flushing cycle.
Observe the refrigerant which flows back into the A/C service
♦
station from the refrigerant circuit, only when the refrigerant
streams clear and completely colorless through the viewing
glass of refrigerant circuit flushing device into the A/C service
station is the refrigerant circuit cleaned.
While flushing, all the refrigerant oil is washed out of the re‐
♦
frigerant circuit (up to a very small amount, for example, in the
evaporator, however this can be disregarded).
If contamination is especially severe, it may be necessary to
♦
perform the flushing procedure twice (two flushing cycles with
three flushing operations each).
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Sequence of Flushing Procedure (sequence occurs automatically
according to the A/C service station program)
♦ After switching on, the flushing circuit (refrigerant circuit with
connecting hoses and flushing equipment for refrigerant cir‐
cuits) is evacuated first and the refrigerant circuit is checked
for leaks during this. (depending on A/C service station ver‐
sion, it is possible that manually switching to advance the
program is required).
♦ A prescribed quantity of refrigerant (such as 5 kg) is filled into
the evacuated refrigerant circuit via the high pressure side of
the A/C service station (in opposite direction of normal flow
when A/C system is in operation and also on the low pressure
side of the vehicle refrigerant circuit), or, as much refrigerant
is filled until refrigerant circuit and viewing glasses of refriger‐
ant circuit flushing device are completely filled with fluid re‐
frigerant (depending on version of A/C service station,
recognized, that is, that refrigerant no longer flows from behind
over a certain time period).
♦ After the prescribed quantity of refrigerant has been filled, for
example, the heater for the refrigerant circuit flushing device
is switched on (only in the event the refrigerant is extracted in
gaseous form from the refrigerant circuit flushing device), de‐
pending on version of A/C service station and refrigerant
circuit flushing device.
♦ After the refrigerant was extracted, the heating of the flushing
device for refrigerant circuits is switched off (if present), it may
occur that the refrigerant circuit is shortly evacuated again,
depending on its version. After evacuation, the refrigerant ex‐
tracted from the refrigerant circuit is deposited by the service
station.
♦ The sequence of filling refrigerant, extracting (and evacuating)
is repeated twice (performed a total of three times).
♦ After the third extraction, the flushing circuit is evacuated de‐
pending on the version of the A/C service station.
Refrigerant R134a Servicing - Edition 01.2011
3
refrigerant oil, in the event
37
1. General Information