VW Golf manuals

Volkswagen Golf Service & Repair Manual: 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 the refrigerant do attack certain metals and plastics. This can lead to blockages, leaks and deposits on the air conditioner compressor piston.
   
Critical temperature and critical pressure
Up to a gas pressure of 39.5 bar positive pressure (corresponding to a temperature of 101°C) the refrigerant R134a remains chemically stable; however, above this temperature the refrigerant decomposes (see Combustibility).
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 a ...

Water content
Only very small amounts of water are soluble in liquid refrigerant. On the other hand, refrigerant vapour and water vapour mix in any proportion. ...

Other materials:

Air conditioner service and recycling equipment
At present, various manufacturers offer air conditioner service devices on the market for evacuating, cleaning and charging refrigerant in vehicle air conditioning systems.     ...

Button for the driver assist systems
Fig. 18 On the turn signal and main beam lever: button for driver assist systems First read and observe the introductory information and safety warnings You can switch the driver assist systems listed in the Assistant menu on and off with the button on the turn signal and main beam lever ...

Separating brake pedal from brake servo
Special tools and workshop equipment required     Release tool -T10159- –  Remove footwell cover on driver side → General body repairs, interior; Rep ...

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