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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
13 - Charging hose of flushing device for refrigerant circuits
❑ From connection to high pressure side of air conditioner compressor on refrigerant circuit (smaller di‐
ameter) to inlet of flushing device for refrigerant circuits.
14 - Flushing device for refrigerant circuits
❑ Different versions and different design of flushing devices for refrigerant circuits ⇒ Electronic parts cata‐
logue (Tools; Workshop equipment/tools; Air conditioning/heating)
❑ With filter, sight glass, safety valve, heating, refrigerant tank, etc. (depending on version).
❑ Depending on the design of the air conditioner service station and the flushing device for refrigerant
circuits, there may be a non-return valve installed at the outlet of the flushing device for refrigerant circuits
(to assure the correct direction of refrigerant flow during flushing).
❑ Depending on the flushing device there may be a 5/8 -18 UNF external thread, a connection for R134a
or a R1234yf high pressure service coupling at the outlet to the air conditioner service station
lk
Note
♦ To ensure that the flushing de‐
vice can be connected to the air
conditioner service station ,
flushing devices with a 5/8 -18
UNF external thread or a con‐
nection for an R134a low pres‐
sure service coupling require an
additional adapter to facilitate
connection of the R1234yf low
pressure service coupling or the
charge hose to the air condition‐
er service station (with an M12 x
1.5-6G external thread in ac‐
cordance with SAE J639) at the
outlet of the flushing device.
♦ The charge hose of the air con‐
ditioner service station has an
M12 x 1.5-6G external thread in
accordance with SAE J639. De‐
pending on the type of service
connection, there may be a low
pressure service coupling in ac‐
cordance with SAE J639 for the
R1234yf refrigerant, an M12 x
1.5-6G internal thread in accord‐
ance with SAE J639, a service
connection for an R134a low
pressure service coupling or a
5/8 - 18 UNF external thread on
the flushing device for refrigerant
circuits. To ensure that both
components can be connected
to each other, an additional
adapter may be necessary ⇒
Electronic parts catalogue .
♦ Since refrigerant is only drawn in
by the air conditioner service sta‐
tion at a low flow speed, the low
pressure service coupling can be
used here.
15 - Refrigerant hose of air conditioner service station
❑ From the low pressure side of the air conditioner service station (normally coloured blue) to the outlet of
the flushing device for refrigerant circuits.
16 - Adapter to seal outlet to second evaporator
❑ Only required on certain vehicles with “second evaporator” (optional equipment)
❑ From adapter case VW/Audi passenger vehicle set
1. Refrigerant circuit
101
GETth
English 
