Audi 100 1991 Repair Manual page 27

Note
As parts are sometimes stored for lengthy periods and at dif‐
♦
ferent locations within the spare parts organization, it is en‐
tirely possible that gas will escape from some parts and not
from others on initial opening (even in the case of identical
spare part numbers). Sealing caps at replacement part con‐
nections are therefore to be removed carefully and the nitro‐
gen gas allowed to escape slowly.
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not The refrigerant circuit is equipped either with a restrictor and
♦
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
accumulator or with an expansion valve and receiver.
with respect to the correctness of information in this document. Copyright by AUDI AG.
Dryer cartridge or components with desiccant bag (accumu‐
♦
lator, receiver) are always to be replaced after cleaning refrig‐
erant circuit (flushing with refrigerant R134a, refer to
⇒ "1.4.13 Refrigerant Circuit Flushing With Refrigerant
R134a", page 32
and nitrogen
⇒ "1.4.12 Refrigerant Circuit Flushing With Compressed Air
and Nitrogen ", page 29
as possible to minimize absorption of moisture.
Dryer cartridge or components with desiccant bag (accumu‐
♦
lator, receiver) are to be replaced if required for certain repair
manual operations or if the refrigerant circuit has been open
for a lengthy period and moisture has penetrated (such as fol‐
lowing an accident). Refer to
⇒ "5.1 Leaking or Damaged Components Except A/C Com‐
pressor, Accumulator or Receiver - Circuit Empty of Refriger‐
ant", page 191 .
The period of time which a refrigerant circuit may be left open
♦
without having to replace a component with desiccant bag
(accumulator, receiver) depends on ambient influences to a
large extent. Given a high ambient temperature and a high
humidity level or if the vehicle, for example, has been standing
in the open or driven (in wet, foggy weather conditions), the
period will be considerably shorter than for a vehicle which has
been standing in a heated dry area. The size of the opening
through which moisture may enter into the circuit also influen‐
ces the period for which a refrigerant circuit can be left open
without having to replace the component with desiccant bag.
Refer to
⇒ "5.1 Leaking or Damaged Components Except A/C Com‐
pressor, Accumulator or Receiver - Circuit Empty of Refriger‐
ant", page 191 .
Seal open connections and pipes (to prevent absorption of
♦
moisture).
Always replace restrictor.
♦
Caution
♦ Dispose of dirty or used oils of unknown origin. Refer to
Audi ServiceNet, Handbooks, HSO Environment.
♦ Leaking or damaged components except a/c compressor, ac‐
cumulator or receiver, refer to
⇒ "5.1 Leaking or Damaged Components Except A/C Com‐
pressor, Accumulator or Receiver - Circuit Empty of Refriger‐
ant", page 191 .
♦ Leaking or damaged components except a/c compressor, ac‐
cumulator or receiver, refer to
⇒ "5.2 Leaking or Damaged Components Except A/C Com‐
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
or blowing through using compressed air
); in doing so, leave sealed as long
Refrigerant R134a Servicing - Edition 01.2011
23
1. General Information