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:

Locking the front passenger door and rear doors manually
Fig. 210 In the end face of the right-hand door: manual lock covered by a rubber seal Fig. 211 Manually locking the vehicle with the vehicle key First read and observe the introductory information and safety warningsThe front passenger door and the rear doors can be locked manually. This ...

Removing and installing air distribution housing
Note The illustration shows a left-hand drive vehicle. The removal and installation procedure is identical for both versions. Removing – Remove heater ...

Checking charge air system for leaks
Special tools and workshop equipment required Charge air system tester -V.A.G 1687- Procedure – Relea ...