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Air conditioning systems with refrigerant R1234yf - General information - Edition 07.2017
Note
♦ The following replacement parts (air conditioner compressor,
receiver, evaporator and condenser) could be filled with nitro‐
gen gas, though this filling is not always guaranteed. There‐
fore, little or no pressure equalisation may be perceived when
the sealing plugs of the replacement part are unscrewed.
♦ Depending on the storage location and storage period, it is
possible on components filled with nitrogen ex-works that
barely any pressure equalisation - if at all - is perceptible and,
as such, nothing can be said about the leak-tightness of the
component. This means, for example, that the nitrogen gas
filling could escape through the shaft seal of a replacement air
conditioner compressor in the course of time, even though the
air conditioner compressor is leak-tight.
♦ Since spare parts are sometimes stored for long periods in
various places, there is a good chance that gas may escape
from some parts when first opened but not from others (even
of the same part number). Therefore, be careful when un‐
screwing the sealing plugs from the replacement part connec‐
tions and allow the nitrogen gas to escape slowly.
♦ One or 2 expansion valves and a receiver or desiccant con‐
tainer are installed in the refrigerant circuit ⇒ Heating, air
conditioning; Rep. gr. 87 ; Refrigerant circuit; System over‐
view - refrigerant circuit .
♦ Renew the desiccant cartridge or components with desiccant
bag (receiver) after cleaning the refrigerant circuit (flush with
R1234yf refrigerant
⇒ “1.6 Cleaning refrigerant circuit”, page 92 ). When doing
so, keep the circuit closed for as long as possible to keep the
ingress of moisture as low as possible.
♦ Seal open connections and pipes (to prevent absorption of
moisture).
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Note
Contaminated refrigerant oils are to be disposed of as used oil of
unknown origin (observe local regulations) ⇒ VW / Audi Service‐
Net .
1.5.2
Renewing leaking or damaged compo‐
nents of empty refrigerant circuit (apart
from air conditioner compressor and re‐
ceiver)
The refrigerant circuit was completely empty (e.g. larger leaks or
ruptured hose line)
♦ Observe the general information about renewing components
⇒ “1.5.1 General information about renewing components”,
page 79
1. Refrigerant circuit
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