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4 Refrigerant circuit
4.1 Important repair notes on air condition‐
ing
• Air conditioning systems designed for refrigerant R12 must not
be charged with refrigerant R134a until specific conversion
measures have been performed ⇒ page 45 .
• The refrigerant oils specifically developed for R134a refriger‐
ant circuits must never be mixed with the refrigerant oils spe‐
cifically developed for R12 refrigerant circuits.
• Air conditioner service stations that come into contact with re‐
frigerants may be used only for the refrigerant for which they
are intended.
• Components for R134a refrigerant circuits are identified with
a legend or a green label, or are so designed (e.g. with different
threads), that they cannot be confused with components for
R12 refrigerant circuits.
• 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.
• Different refrigerants must never be mixed together.
Note
When working on the refrigerant circuit please refer to the infor‐
mation listed under “Safety precautions” ⇒ page 13 and “Basic
procedures for working on refrigerant circuits” ⇒ page 14 .
4.2 Retrofitting refrigerant circuit from R12
refrigerant to R134a refrigerant
Chlorofluorocarbon (CFC) is no longer used as a refrigerant in the
automotive sector.
R12Converting refrigerant circuits from refrigerant R12 to refrig‐
erant R134a and repairing the converted circuits.
⇒ Repair manual for air conditioning systems with refrigerant R12
parts 2 and 3 . This workshop manual is only available as a hard
copy.
Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
46 Rep. gr.00 - Technical data
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