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Volkswagen Polo Service & Repair Manual: Refrigerant R134a Physical Data

Vehicle air conditioning systems make use of the vaporization and condensation process. In this case, one works with a substance which boils easily, designated as refrigerant.
The refrigerant employed is tetrafluoroethane R134a, which boils at -26.5 °C (-15.7 °F) at a vapor pressure of 1 bar (14.5 psi).
   
Chemical formula CH2F–CF3 or CF3–CH2F
Chemical designation Tetrafluoroethane
Boiling point at 1 bar (14.5 psi) -26.5 °C (-15.7 °F)
Solidification point -101.6 °C (-150.88 °F)
Critical temperature 100.6 °C (213 °F)
Critical pressure 40.56 bar absolute (588 psi) equals 39.5 bar pressure (573 psi)
Refrigerant R134a
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Critical Point
Vehicle air conditioning systems make use of the vaporization and condensation process. In this case, one works with a substance which boils easily, designated as ref ...

Other materials:

Wheel cover
Fig. 163 Removing press-on wheel covers Fig. 164 Removing bolted-on wheel covers First read and observe the introductory information and safety warnings Removing and fitting press-on wheel covers Take the box spanner and wire hook from the toolkit . Insert the wire hook into o ...

Introduction
This chapter contains information on the following subjects:  → Running-in  → Accessories and parts  → Service fluids and consumables  → Repairs and technical modifications  → Repairs and faults in the airbag system  → Retrofitting two-way radios ...

Seat heating
Fig. 43 In the centre console: buttons for the front seat heating First read and observe the introductory information and safety warnings The seat cushions on the front seats can be heated electrically when the ignition is switched on. In some versions, the backrests may also be heated. D ...

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