VW Golf manuals

Volkswagen Golf Service & Repair Manual: Vapour pressure

In an enclosed container that is not completely full, refrigerant evaporates as vapour at the surface in a quantity sufficient to form an equilibrium between vapour and liquid. This equilibrium develops under pressure and is often called vapour pressure. The vapour pressure is temperature-dependant → Chapter.
   
Physical properties of R134a
Because the vapour pressure curves of R134a and other refrigerants are in part very similar, unique identification on the basis of pressure alone is not possible.
The air conditioner compressor used for R134a is lubricated with special synthetic refrigerator oils, such as PAG oils (polyalkylene glycol oils).
Trade names and designations
Refrigerant R134a is currently available under the following trade designations: H-FKW 134a SUVA 134a ...

Effects on metal
In its pure state, refrigerant R134a is chemically stable and does not attack iron or aluminium. However, impurities such as chlorine compounds in th ...

Other materials:

Removing and installing Bowden cable
Removing   WARNING It is not permissible to loosen bolts other than those specified. Also, it is not permissible to perform any repair work other than described ...

Removing and installing control unit for daytime running light and side light -J860-/-J861-
  WARNING Risk of death due to high voltage! Risk of injury and environmental pollution! Observe operation and safety notes for gas discharge bulbs → Chapte ...

Blowing through refrigerant circuit with compressed air and nitrogen
Use compressed air to force moisture and other contaminants out of the refrigerant circuit and use nitrogen to force moisture out of the refrigerant circuit. The method of blowing through the refrigerant circuit with compressed air ...

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