Passat (B3)
| Refrigerant circuit with restrictor and reservoir |
| Arrows show the direction of refrigerant flow. |
| A- low-pressure side of the refrigerant circuit. |
| B- high-pressure side of the refrigerant circuit. |
| Component | Overall state of the refrigerant | Pressure (in bar) | Temperature in degrees Celsius |
| -1- Air conditioning system compressor B-side | Gas | up to 20 bar | to + 70 °C |
| -2- Condenser | from gas through vapour to liquid | up to 20 bar | to + 70 °C |
| -3- Restrictor | from liquid to vapour | B-side up to 20 bar, A-side greater than 1.5 bar | B-side up to +60 °C, A-side warmer than -4 °C |
| -4- Evaporator | from vapour to gas | greater than 1.5 bar | warmer than 4 °C |
| -5- Reservoir | Gas | ||
| -6- Air conditioning system compressor A-side | Gas |
| The pressures on the A-side are held at approx. 2 bar by the „regulating“ air conditioner compressor even at differing engine speeds. This applies however only within the rated range of the air conditioner compressor ; if the rated range of the air conditioner compressor is exceeded, the pressure will increase → Chapter. |
Note| In vehicles with air conditioner compressor regulating valve -N280-, the pressure on the low-pressure side is varied by activating the valve. |