Volkswagen Amarok 2011 Service & Maintenance page 29

Note
Rinsing of a refrigerant circuit is to be carried out in accordance
♦
with the operating instructions for the A/C service station.
♦
The container for old oil holds only approx. 125 cm
erant oil, depending on the type of A/C service station. If a
system has to be rinsed with a larger amount of refrigerant oil,
it may be necessary to drain the old-oil container after the first
rinsing run of a rinsing cycle.
Keep an eye on the refrigerant that flows back out of the re‐
♦
frigerant circuit. The refrigerant circuit has been cleaned only
if the refrigerant is clear and completely colourless when it
flows through the sight glass(es) of the rinsing device for re‐
frigerant circuits and into the A/C service station.
During rinsing, the entire refrigerant oil is washed out of the
♦
refrigerant circuit (except for a very small residue which can
be ignored).
If the circuit is very dirty, it may be necessary to carry out two
♦
rinsing cycles (2 rinsing cycles, each cycle consisting of 3
rinsing runs). Before the second rinsing cycle, the filter of the
rinsing device must be replaced with a new one.
Sequence of steps in a rinsing run (these steps are carried out
automatically in accordance with the program of the A/C service
station)
♦ After the station is switched on, the rinsing circuit (refrigerant
circuit with connecting hoses and the rinsing device for refrig‐
erant circuits) is first evacuated, whereby the refrigerant circuit
is checked for leaks at the same time. It may be necessary to
start the next steps manually, depending on the type of A/C
service station.
♦ A predetermined amount of refrigerant (e.g. 4 kg) is pumped
into the evacuated rinsing circuit via the high-pressure side of
the A/C service station (opposite to the direction of flow that is
normal during operation of the air-conditioning system) and
therefore at the low-pressure end of the vehicle's refrigerant
circuit. Depending on the type of A/C service station, enough
refrigerant is pumped in until the rinsing circuit has been com‐
pletely filled with liquid refrigerant. This is indicated by the fact
that refrigerant stops flowing into the circuit for a certain
amount of time, for example.
♦ After the specified amount of refrigerant has been pumped in,
the heater of the rinsing device for refrigerant circuits is switch‐
ed on, for example, depending on the type of A/C service
station and rinsing device for refrigerant circuits (only if the
refrigerant is extracted in gaseous form from the rinsing device
for refrigerant circuits).
♦ Once the refrigerant has been extracted, the heater (if there is
one) of the rinsing device for refrigerant circuits is switched off
(it is possible that the refrigerant circuit will then be briefly
evacuated again, depending on the type of equipment). After
evacuation, the refrigerant oil extracted from the refrigerant
circuit is separated by the A/C service station.
♦ The sequential procedure of filling, extracting (and evacuating)
refrigerant is repeated twice (i.e. three times altogether).
♦ After the third extraction, the rinsing circuit is evacuated, de‐
pending on the type of A/C service station.
Maintenance - Edition 10.2012
3
of refrig‐
Amarok 2011 ➤
2. General rules of cleanliness
25