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:

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1 - Shim for “K 1” Determining thickness → Chapter. 2 - Large engaging lever for “K 1” With engagement bearing Removing and installing → Chapter ...

Overview of fitting locations - electrical and electronic components, electrically adjustable seat
1 - Seat rake adjustment Driver seat rake adjustment motor -V243 Front passenger seat rake adjustment motor -V244- Assembly overview → Anchor Removing and installing → Chapter 2 - Seat longitudinal adjuster ...

Is the smell coming from evaporator or the heat exchanger?
Fishy smell – Due to leak in engine's cooling system or in heat exchanger of heater and air conditioner unit. Note If the fishy smell is weaker when the temperature is set to “cold” or st ...