Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...
Air conditioner with refrigerant R134a - Edition 11.2018
5
Refrigerant circuit
⇒ “5.1 Important repair notes for air conditioning systems”,
page 78
⇒ “5.2 Converting refrigerant circuits from refrigerant R12 to re‐
frigerant R134a ”, page 78
⇒ “5.3 Working with the air conditioner service station”,
page 79
⇒ “5.4 Blowing out refrigerant circuit with compressed air and ni‐
trogen ”, page 95
⇒ “5.5 Cleaning (flushing) refrigerant circuit with refrigerant
R134a”, page 100
⇒ “5.6 Tracing leaks in refrigerant circuit ”, page 169
5.1
Important repair notes for air condition‐
ing systems
•
Air conditioners for refrigerant R12 may only be filled with re‐
frigerant R134a if certain prerequisites are satisfied
⇒ page 77 and ⇒ Workshop Manual: Air conditioner with re‐
frigerant R12 Part 2 and 3 . This Workshop Manual is only
available in hardcopy form.
•
•
•
The refrigerant oils specifically developed for R134a and R12
refrigerant circuits are never to be mixed.
Air conditioner service stations which come into contact with
the refrigerant should only be used for the intended refrigerant.
The components of an R134a refrigerant circuit are accord‐
ingly labelled, marked with green stickers or designed (e.g. a
different thread) such that interchange with components for
refrigerant R12 is not possible.
•
•
Within the engine compartment, on the bonnet catch striker
plate or in the plenum chamber there is an information plate
which states what refrigerant is used.
Never mix different refrigerants.
Note
When working on the refrigerant circuit, always pay attention the
information given in the Sections on “Safety measures”
⇒ page 18 and “Basic rules for working on refrigerant circuit”
⇒ page 22 .
5.2
Converting refrigerant circuits from re‐
frigerant R12 to refrigerant R134a
CFC refrigerants are no longer used in the automotive industry.
For conversion of refrigerant circuits from R12 to R134a and
servicing converted circuits, refer to
⇒ Workshop Manual: Air conditioner with refrigerant R12 Parts 2
and 3 (this Workshop Manual is only available in printed form).
78
Rep. gr.87 - Air conditioning system
English 
