VW Polo manuals

Volkswagen Polo Service & Repair Manual: Commercial Names and Designations

Refrigerant R134a is currently available under the following trade names:
H-FKW 134a
SUVA 134a
KLEA 134a
  Note
Different trade names may be used in other countries.
Of the wide range of refrigerants available, this is the only one which may be used for vehicles. The designations Frigen and Freon are trade names. They also apply to refrigerants which may not be used in automotive vehicles.
   
Color

Like water, refrigerants are colorless in both vapor and liquid form. Gas is invisible. Only the boundary layer between gas and liquid is visible. (Liquid level in tube of charging cylinder or bubbles in sight glass). Refrigerant R134a fluid may appear colored (milky) in a sight glass. This cloudiness is caused by partially dissolved refrigerant oil and does not indicate a malfunction.

Vapor Pressure
In a partially filled, closed vessel, the quantity of refrigerant evaporating from the surface equals the quantity returning to the liquid state as vapor particles condense. This state of equilibrium occurs under the influence of pressure and is often called vapor pressure. Vapor pressure is dependent on temperature. Refer to → Chapter „Refrigerant R134a Vapor Pressure Table“.
   

R134a Physical Characteristics

The vapor pressure curves of R134a and other refrigerants are sometimes very similar, therefore it is not possible to make a certain distinction solely by pressure.
With R134a, the A/C compressor is lubricated with special synthetic refrigerant oils, for example. PAG oils (polyalkylene glycol oils).
   

Affect on Metal

In its pure state, refrigerant R134a is chemically stable and does not corrode iron or aluminum.
Refrigerant impurities such as chlorine compounds however cause corrosion of certain metals and plastics. This can lead to blockage, leaks or deposits on the A/C compressor piston.
Critical Temperature/Pressure
The refrigerant R134a remains chemically stable up to a gas pressure of 39.5 bar (572.9 psi) (corresponding to a temperature of 101 °C (213 °F). Above this temperature, the refrigerant decomposes. Refer to → Chapter „Combustibility“.
   
Refrigerant R134a Characteristics
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Water Content
Only very small amounts of water are soluble in liquid refrigerant. On the other hand, refrigerant vapor and water vapor mix in any ratio. Only ...

Other materials:

Introduction
This chapter contains information on the following subjects:  → Information stickers and plates  → Using the vehicle in other countries and continents  → Radio reception and aerials  → Volkswagen repair information  → Declaration of conformity  → ...

Paint System for Plastic Parts
This universal painting system enables you to safely and simply paint all plastic parts which can be usually found on the exterior. (Plastic types: PP, EPDM, ABS, PC, PPO, PBTP, UP-GF, PA, PVC, R-TPU, PUR) This technical reference material does not apply ...

Controls for the heating and fresh air system
Fig. 127 In the centre console: rotary controller of the heating and fresh air system with controls First read and observe the introductory information and safety warnings  Button, control Additional information. Heating and fresh air system   ...

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