Volkswagen Golf 1999 Service Manual page 3916

A/C refrigerant system, servicing
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A/C refrigerant system, flushing with
compressed air and nitrogen
CAUTION!
When using compressed nitrogen always
use a pressure regulator and the proper
adaptor hoses and fittings (available locally).
During flushing, use existing
exhaust/ventilation systems to draw off the
gas mixture escaping from the A/C system.
DO NOT flush R-134a refrigerant system with
R-11. R-11 is not compatible with R-134a
refrigerant and PAG oil and will cause total
system contamination.
Flush refrigerant system with compressed air and
nitrogen if:
Refrigerant oil is dark and viscous (thick)
Too much refrigerant oil is in the system
following compressor replacement
Unclear or do not know how much refrigerant oil
is in the system
Moisture, dirt or other impurities have entered
the refrigerant system (i.e. following an
accident)
Unable to pull a constant vacuum during
evacuation of a leak-free system due to
excessive moisture in the system
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13/2/2005