Volkswagen Passat 1995 Official Factory Repair Manual page 4096

A/C refrigerant system, notes
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WARNING!
Keep refrigerant containers stored below
50 C (122 F) and never drop from high
places. DO NOT warm refrigerant containers
with an open flame. If refrigerant needs to be
warmed, place bottom of tank in warm water.
Keep refrigerant away from open flames
because poisonous gas will be produced if it
burns. Do not smoke when refrigerant gases
are present for the same reason.
Electric welding near refrigerant hoses
causes R-134a to decompose from ultraviolet
light. Discharge system before electric
welding.
Pressurized R-134a refrigerant in the
presence of oxygen may form a combustible
mixture. Never introduce compressed air into
any closed R-134a container (full or empty),
A/C component or piece of service
equipment.
DO NOT exceed maximum rated capacity of
refrigerant containers. Never fill a container
to more than 60% of its gross weight rating
(for example, 18 lb. in a 30 lb. container.)
Without sufficient room for expansion of R-
134a (gas cushion), the container could
explode when the temperature rises causing
serious injury.
Do not steam clean condensers or
evaporators. Use only cold water or
compressed air.
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