Volkswagen Golf Service & Repair Manual: Vapour pressure

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General notes on air conditioning systems / Characteristics of refrigerant R134a / 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:

Correct sitting position
Fig. 41 There must be a distance of at least 25 cm between the driver and the steering wheel The distance to the dash panel must be at least 10 cm in the knee area Fig. 42 Correct seat belt routing and head restraint adjustment First read and observe the introductory information and safe ...

Front view
Fig. 2 Overview of the front of the vehicle Key for : Sensor or camera window on the mirror base for: Rain sensor Main beam assist (Light Assist) Lane departure warning system (Lane Assist) Road sign recognition Windscreen W ...

Removing and installing refrigerant pressure and temperature sender -G395
Special tools and workshop equipment required Torque wrench -V.A.G 1331/- (5…50 Nm) Engine bung set -VAS 6122- Air condit ...