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:

Removing and installing connecting Bowden cable
Removing –  Remove backrest cover and backrest padding → Chapter.     –  Swing mounting bracket for backrest release mechanism -1- upwards as far as ...

Front brakes
    Item PR No.   1ZF 1 Brake caliper FS III (15”) 2 Brake pad, thickness mm 12 Brake pad, wear limit without backplate mm 2 3 Brak ...

After purging refrigerant circuit of contaminants, e.g. due to moisture intrusion (because refrigerant circuit has stood open for a length of time) or due to dirt
The reservoir or receiver or cartridge of the dryer bag need not be renewed under the following circumstances: After an accident in which there was no damage to the reservoir or receiver. Repairs are performe ...

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