Volkswagen Golf 1999 Service Manual page 3917

A/C refrigerant system, servicing
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Refrigerant system has been open longer than
the time required for normal repairs (i.e.
following an accident)
Based on temperature and pressure
measurements, system is diagnosed with
moisture contamination
Compressor is replaced due to noises or
internal damage
Flushing is required after replacing certain
components in certain situations
87 .
Flushing
Use compressed air and nitrogen (available
locally) to remove moisture, impurities and old
refrigerant oil from A/C refrigerant system.
First blow out old refrigerant oil and dirt with
compressed air, then dry components with
nitrogen.
DO NOT blow compressed air and nitrogen
through the compressor or expansion valve.
Only blow compressed air and nitrogen through
disconnected, free flowing components (i.e.
disconnected hose, condenser, evaporator,
etc.)
DO NOT blow compressed air and nitrogen into
a capped off A/C component. Pressurized R-
134a refrigerant in the presence of oxygen may
form a combustible mixture.
Página 48 de 51
87-127
Page 87-
13/2/2005