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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:

Lifting the vehicle with the jack
Fig. 224 Jacking points Fig. 225 Vehicle jack at the rear left-hand side of the vehicle First read and observe the introductory information and safety warningsThe jack may be applied only at the jacking points shown (markings on the body) . Always use the jacking point closest to the wheel ...

Removing and installing tail light in rear lid
  Note Removal and installation are described for the left side. Removal and installation on the right side are carried out in the same way. If the event of a defective LED, the entire tail light needs to be rene ...

Changing bulbs in xenon headlights
Fig. 235 In the engine compartment: ① cover in left-hand xenon headlight, ② cornering light, ③ turn signal, ④ side light and daytime running light First read and observe the introductory information and safety warningsThe front headlight does not need to be removed when changing bu ...

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