Volkswagen Passat 1995 Official Factory Repair Manual page 4160

A/C refrigerant system
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.HA01.87.4
Receiver drier
The receiver drier accumulator acts as a refrigerant
reservoir for the system. Any moisture in the
refrigerant system is absorbed by drier desiccantr.
Note:
Replace the receiver drier each time the refrigerant
circuit is opened.
CAUTION!
The receiver drier may be identified with a green
R-134a label and MUST NOT be used in R-12
systems (the drier desiccant inside is only
compatible with R-134a refrigerant). Likewise,
NEVER use an R-12 receiver drier in an R-134a
system.
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12/7/2004