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:

Vehicles with torsion beam axle
1 - Rubber mounting Renew if damaged 2 - Bolt 20 Nm 3 - Mounting Renew if damaged 4 - Rear silencer In initial equipmen ...

Instructions for work on underbody and stone chip protection
Note The structure of the underbody and stone chip protection is to be reconstructed to conform to the original condition in appearance and thickness. Water drainage holes must remain clear. ...

Introduction
This chapter contains information on the following subjects: → Drink holders in the front centre console → Drink holders in the rear centre armrest → Drink holder in the rear side trim Bottle holder Bottle holders are located in the open stowage areas of t ...