Volkswagen Golf 1999 Service Manual page 3868

A/C refrigerant system
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A/C refrigerant system, replacing
components
Replacement A/C compressors, evaporators
and condensers supplied by the Parts
Department are filled with Nitrogen. If gas
(Nitrogen) does not escape when the
component is first opened, the component
may be faulty (leaking) and must not be
installed.
Replacement A/C compressors are filled
with the total refrigerant oil quantity needed
for the entire refrigerant system.
Always replace the receiver drier whenever
the refrigerant system has been left open.
Install immediately after opening to prevent
moisture contamination of drier desiccant.
Moreover, keep refrigerant system and other
replacement components sealed for as long
as possible to minimize the chance of dirt
and moisture contamination.
Always plug open refrigerant line
connections to prevent dirt and moisture
contamination.
If the system has been discharged because
of a damaged or leaking component
(refrigerant hose/line, compressor,
evaporator, condenser, etc.), flush the
refrigerant system first with compressed air,
then with Nitrogen (available locally) and
collect the oil that runs out. This will remove
the refrigerant oil which may be saturated
with moisture.
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13/2/2005