Cabrio GL L4-2.0L (ABA) (2001)
Refrigerant: Vehicle Damage Warnings
Effects on Plastics
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 VW replacement parts which are specified for use with the R-134a
refrigerant.
Effects on Metal
Effects 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), which could lead to blockage, leaks or deposits on the compressor piston. Therefore, when making system
repairs, use only genuine VW replacement parts that are specified for use with R-134a refrigerant.
Water Solubility
Water solubility
Liquid R-134a refrigerant will absorb only very minute quantities of moisture. However, R-134a vapor can absorb large amounts of moisture.
Water in the system forms ice in the expansion valve or restrictor causing the system to stop cooling. In addition, moisture combines with the refrigerant
to form acids which will damage the system.
Refrigerant Containers
Refrigerant containers
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.
Flammability
Flammability
R-134a refrigerant is not flammable. In fact, it tends to inhibit combustion and has a fire extinguishing effect. However, a flame or glowing hot surface,
as well as ultraviolet light (from electric welding), will decompose the refrigerant into poisonous gases (hydrogen fluoride, carbonyl fluoride and
fluorine). These gases give adequate warning of their presence since they cause irritation of the mucous membrane (throat).
R-134a can become flammable at pressures above ambient pressure in conjunction with air concentrations greater than 60% by volume.