Volkswagen Golf Service & Repair Manual: Effects on metal

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

Securing child seats using lower anchoring points (ISOFIX, LATCH)
Fig. 78 On vehicle seat: different markings identifying the lower anchoring points for child seats Fig. 79 On the vehicle seat: protective caps for the inner anchoring point First read and observe the introductory information and safety warnings Two retaining rings, also known as lower ...

Trade names and designations
Refrigerant R134a is currently available under the following trade designations: H-FKW 134a SUVA 134a KLEA 134a Note Other trade designations ...

Removing and installing radiator grille
Removing Note On vehicles with a flap for the charging bay in the radiator grille, the connector must be disconnected first. – Remove bolts -2-. – Release catc ...