Volkswagen Passat 1995 Official Factory Repair Manual page 4157

A/C refrigerant system
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A/C refrigerant system, component
overview
Compressor
The compressor is driven via a belt on the engine
when power is applied to the the A/C clutch -N25-
(A/C "ON").
Low-pressure refrigerant gas from the evaporator is
compressed by the compressor. After compression,
the refrigerant gas (now high-pressure) flows to the
condenser.
Notes:
The compressor contains refrigerant oil that is
mixable under all temperatures with the
refrigerant.
A label on the compressor indicates that
compressor is for R-134a systems only.
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12/7/2004