Volkswagen Passat 1995 Official Factory Repair Manual page 4100

A/C refrigerant system, notes
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A/C refrigerant R-134a, properties
Commercial designation
Obtain R-134a refrigerant from a local A/C
supplier under one of the following names:
R-134a
Tetrafluoroethane
CH F CF
2 3
H-FKW 134a
SUVA TRANS A/C
ARCTON 134a
Note
R-134a refrigerant is packaged in different
containers. One variation is SUVA COLD MP
used only for commercial applications. This type
of R-134a is sold in cylinders using a 1/4 flare
fitting which will not connect to the 1/2"-16 ACME
fittings used on the vehicle and servicing
equipment. Use only R-134a which comes in
containers having the correct type of service
fitting.
Color
Refrigerant R-134a is colorless and is invisible as
a gas. R-134a when viewed through a sight glass
(if installed) may appear milky due to the mixture
of refrigerant and lubricating oil (PAG oil).
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