Volkswagen Passat 1995 Official Factory Repair Manual page 4098

A/C refrigerant system, notes
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.HA01.87.1
CAUTION!
Always use separate refrigerant
recovery/recycling/recharging servicing
equipment for R-12 and R-134a systems. DO
NOT use one piece of equipment for both R-
12 and R-134a systems. The residual traces
of refrigerant will contaminate and damage
the equipment. Servicing equipment includes
recovery/ recycling/recharging unit, charging
station, vacuum pump, manifold gauges, etc.
DO NOT use R-12 servicing equipment on R-
134a systems or R-134a equipment on R-12
systems or damage to both the vehicle A/C
system and servicing equipment may result.
Use only equipment designed to meet
Society of Automotive Engineers (SAE)
standards.
R-134a and R-12 systems use different size
service fittings. NEVER use adaptors to
convert an R-12 fitting to R-134a size or R-
134a fitting to R-12 size.
R-134a and R-12 A/C components including
compressor, hoses, O-rings, evaporator,
condenser, receiver-drier, etc. are NOT
interchangeable. Components of the R-134a
system are identified by lettering "R-134a" or
by a green label (or stripe). In addition, a
label on the evaporator housing (below
plenum tray) identifies which type of
refrigerant is used. Use only the correct
system component for each refrigerant type.
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