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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:

Special Tools
Special tools and workshop equipment required     Torque Wrench 1331 5-50Nm -VAG1331- Crimping Pliers, Complete -VAS1978/1A-   ...

Driving with an open tailgate
First read and observe the introductory information and safety warnings Driving with an open tailgate is particularly dangerous. Ensure that the open tailgate and any objects are secured properly, and take appropriate measures to reduce the quantity of toxic exhaust fumes entering the vehicle ...

Introduction
This chapter contains information on the following subjects: → Controls for the air conditioning system    → Controls for the heating and fresh air system    → Information on the air conditioning system    → Vents    → Air recirculation mode   ...

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