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:

Conducting a road test before balancing wheels
If a customer brings a vehicle to the workshop complaining about “vibration”, a road test is essential prior to balancing the wheels. This will give you information about the nature of the vibration. ...

Mobile telephone preparation, Bluetooth car phone online
The Bluetooth car phone is integrated in control unit 1 for information electronics -J794-. Connection to mobile telephone -R54- is established via Bluetooth. Aerial for Bluetooth -R152- is integrated into control unit ...

Removing and installing immobiliser reader coil -D2-, vehicles with keyless access locking and starting system
Removing –  Move steering wheel to rearmost and lowest position. Use the entire range of adjustment of the steering column for this purpose. –  Remove lower steering column trim →&nb ...

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