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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:

Additional Information Sources
Technical Service Handbook outlining action to be taken to rectify current problems. For the repair manual for model-specific repair work. Refer to → Heating, Ventilation and Air Conditioning; Rep. Gr.87. ...

Sealing and inflating tyres
First read and observe the introductory information and safety warnings Sealing a tyre Unscrew the cap from the tyre valve. Use the valve core extractor to screw the valve core out of the tyre valve. Place the core on a clean surface. Shake the tyre filler bottle vigorously up ...

Refrigerant Circuit Repair Information
  WARNING When performing work on refrigerant circuit, observe all generally applicable safety precautions and pressure vessel regulations.   Cautio ...

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