Golf L4-2.0L (AEG) (1999)
Refrigerant: Description and Operation
The following designations are used and appear on component labels and factor tags:
-
R-134a
-
Tetrafluoroethane
-
CH2F CF3
-
H-KW 134a
-
SUVA(R) 134a
-
ARCTON(R) 134a
Color
Refrigerant R-134a is colorless and is invisible as a gas. R-134a when viewed through the sight glass may appear milky due to the mixture of refrigerant
and lubricating oil (PAG oil).
Temperature/pressure relationship
R-134a in an enclosed container will have a specific temperature/pressure relationship.
Temperature in °C (°F)
Pressure in bar (psi)
-30 (-22)
0.0 (0.0)
-20 (-4)
0.3 (4.4)
-10 (14)
1.0 (14.5)
0 (32)
1.9 (27.5)
10 (50)
3.1 (45.0)
20 (68)
4.7 (68.2)
30 (86)
6.7 (97.2)
40 (104)
9.1 (132.0)
50 (122)
12.2 (177.0)
60 (140)
15.8 (229.2)
70 (158)
20.2 (293.0)
Refrigerant oil
A special Polyalkylene Glycol (PAG) synthetic oil is used in R-134a systems. This oil is NOT compatible with mineral based oils used in R-12 systems.
See: Heating and Air Conditioning/Service Precautions
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 WV 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 WV 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.
Flammability
R-134a refrigerant is not flammable.
Refrigerant containers