Volkswagen Passat 1995 Official Factory Repair Manual page 4102

A/C refrigerant system, notes
http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Goto&type=repair&id=VW.B4.HA01.87.1
Airborne properties
Escaped refrigerant gases are heavier than air
and will gather first in low places, like under the
car. R-134a refrigerant gas displaces oxygen and
may cause suffocation in low areas of poor air
circulation.
Effects on the environment
Because R-134a does not contain chlorine
atoms, the major catalyst in ozone depletion, R-
134a has no ozone depletion potential.
R-134a does not cause smog and has a
considerably lower global warming potential
(greenhouse effect) than R-12 refrigerant.
Nonetheless, do not release R-134a into the
environment and always recover/recycle using
approved service equipment.
Effects on plastics
Refrigerant R-134a will deteriorate some plastics.
When system temperature drops, these plastics
can be deposited at the expansion valve or
restrictor causing blockage. Therefore, when
making system repairs, use only genuine Audi
replacement parts which are specified for use
with R-134a refrigerant.
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