Volkswagen Golf Service & Repair Manual: Trade names and designations

Volkswagen Golf Service & Repair Manual / Air conditioning system with refrigerant R134a / General notes on air conditioning systems / Characteristics of refrigerant R134a / 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 may be used in other countries.

Among the large selection of various refrigerants, only this one may be used for vehicles. The designations Frigen or Freon are trade names. They apply also to refrigerants which must not be used in vehicles.

Colour

Like water, the refrigerant is colourless both in the vapour state and the liquid state. Gases are invisible. Only the boundary layer between gas and liquid is visible. (Fluid level in indicator tube of charging cylinder for bubbles in sight glass.) Liquid refrigerant R134a may appear coloured (milky) in a sight glass. This cloudiness is caused by partially dissolved refrigerant oil and does not indicate a fault.

Characteristics of refrigerant R134a

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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 ...

Other materials:

Removing and installing refrigerant shut-off valve for heater and air conditioner unit -N541
Removing – Observe safety precautions → Chapter „Safety precautions when handling refrigerants“. – Comply with notes → Chapter „Working on refrigerant circuit“. ...

Removing and installing baffle plate, RHD vehicles
Removing – Depending on version, remove plastic bolt or plug -2- and remove baffle plate -1-. Installing – Install in reverse order ...

Removing and installing tyre pressure sensor, Siemens tyre pressure monitoring system
WARNING After tyre sealant has been used, the tyre pressure sensor of the respective wheel must be renewed. The Siemens system does not have a micro-encapsulated bolt. ...