Volkswagen Touran Service Manual: Refrigerant Circuit with Restrictor and Reservoir
Arrows point in direction of refrigerant flow. |
A-Low pressure side of refrigerant circuit. |
B-High pressure side of refrigerant circuit. |

Component |
Aggregate state of refrigerant |
Pressure bar (psi) positive pressure |
Temperature
in degrees Celsius (Fahrenheit) |
-1-
A/C compressor B-side |
Gas |
up to 20 (290 psi) |
up to 70 (158) |
-2-
Condenser |
From gas to vapor to
fluid |
up to 20 (290 psi) |
up to 70 (158) |
-3-
Restrictor |
From fluid to vapor |
B-side to 20 (290 psi),
A-side greater than 1.5 (21.8 psi) |
B-side up to 60 (140 psi),
A-side warmer than -4 (25) |
-4-
Evaporator |
From vapor to gas |
Greater than 1.5 (21.8
psi) |
Warmer than -4 (25) |
-5-
Reservoir |
Gas |
|
|
-6-
A/C compressor A-side |
Gas |
|
|
Pressures on A-side are maintained at approximately 2 bar (29 psi)
by "regulating" A/C compressor also at various engine speeds. However,
this applies only within the performance range of the A/C compressor; if
the performance limits of the A/C compressor are exceeded. Refer to
→ Chapter "Pressures, Checking". |

Note
In vehicles with A/C Compressor Regulator Valve -N280-, the pressure
is modified on the low pressure side by the valve. |
A-Low pressure side of refrigerant circuit.
B-High pressure side of refrigerant circuit.
Component
A ...
Indicators on pressure gauge
1 -
Temperature scale for refrigerant R134a CF3CH2F or
CH2FCF3.
2 -
...
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