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:

2-pack fine filler
Designation: 2-pack fine filler -LSP 784 002 A2- Issued 06/2011 Product description The 2-pack fine filler is a very fine, thixotropic polyester filler. ...

Assembly overview - sealing flange, belt pulley end
1 - Bolt Risk of damage to engine caused by incorrect valve timing.Do not turn crankshaft out of TDC position. Specified torque → Item 2 - Vibration damper Removing and installing →&nb ...

Safety precautions when working in the vicinity of high-voltage components
Danger to life due to high voltage The high-voltage system is under high voltage. If high-voltage components are damaged, there is a risk of severe or fatal injury due to electric shock. – Perform visual check of high-voltage components and high-v ...