Volkswagen Golf 1999 Service Manual page 3857

A/C refrigerant system
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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.
Refrigerant R-134a is not poisonous in any
state (liquid or gas) and is safe when used
properly.
Affects on plastic
Refrigerant R-134a will deteriorate some
plastics. Therefore, when making system
repairs, use only genuine VW replacement
parts which are specified for use with R-
134a refrigerant.
Affects on metal
In its pure state, refrigerant R-134a is
chemically stable and will not attack iron,
copper, brass or aluminum. However, the
mixture of R-134a and PAG oil may
deteriorate certain metals (copper).
Therefore, when making system repairs,
use only genuine VW replacement parts
which are specified for use with R-134a
refrigerant.
Water solubility
Liquid R-134a refrigerant will absorb only
very minute quantities of moisture.
However, R-134a vapor can absorb large
amounts of moisture.
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13/2/2005