Volkswagen Polo Service & Repair Manual: Refrigerant R134a Physical Data

Volkswagen Polo Service & Repair Manual / Refrrigerant R134a Servicing / A/C System, General Information / Refrigerant R134a / 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)

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:

Flushing Not Necessary
Note For vehicles with an electrically-driven A/C compressor, de-energize the high voltage system before removing the A/C compressor. Refer to → Electrical System Hybrid; Rep. Gr.93. – Dischar ...

EU Type Approval Number, Sales Code and Sales or Trade Name
The Additional Descriptions Only Apply to VW Vehicles. Since 01/01/1998, all passenger vehicles licensed for road use within the European Union must possess type approval according to EU guidelines . Vehicles licensed for road use with single-vehicle approval accordin ...

Possible Concerns
Note The A/C system is functioning correctly when the air flowing from the instrument panel vents has a temperature of 70C or lower. Setting on Climatronic “LO”. Setting on A/C system ...