Volkswagen Polo Service & Repair Manual: Refrigerant Circuit with Expansion Valve
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-
Evaporator, from input to output |
Vapor |
Approximately 1.2 (17.4)
→ Note |
Approximately -7 (20)
→ Note |
|
|
(Approximately 1.8
(26.1))
→ Note |
Approximately -1 (30)
→ Note |
-2-
A/C compressor A-side |
Gas |
Approximately 1.2 (17.4)
→ Note |
Approximately -1 (30) |
|
|
(Approximately 1.8
(26.1))
→ Note |
Approximately -1 (30)
→ Note |
-3-
A/C compressor B-side |
Gas |
Approximately 14 (203.1) |
Approximately 65 (149) |
-4-
Condenser |
Gas, vapor, fluid |
Approximately 14 (203.1) |
Approximately 55 (131) at
outlet |
-5-
Receiver |
Fluid |
Approximately 14 (203.1) |
Approximately 55 (131) |
-6-
Extraction and filling valve, B-side |
Fluid |
Approximately 14 (203.1) |
Approximately 55 (131) |
-7-
Expansion valve |
Fluid, released as vapor |
Approximately 14 (203.1) |
Approximately 55 (131),
reduced to -7 (20) |
-8-
Extraction and filling valve, A-side |
Gas |
Approximately 1.2 (17.4)
→ Note |
Approximately -7 (20)
→ Note |
|
|
(Approximately 1.8 (26.1))
→ Note |
Approximately -1 (30)
→ Note |
1) |
Pressure in refrigerant circuits is maintained at
approximately 2 bar (29 psi), regulated by A/C compressor, even though
heat transfer changes and engine speeds vary. However, this applies only
within the performance range of the A/C compressor; if the performance
limits of the A/C compressor are exceeded, the pressure increases. Refer
to
→ Chapter „Pressures, Checking“. |
2) |
Within the control range of the A/C compressor,
temperature in the refrigerant circuits is maintained, regulated by A/C
compressor, even though heat transfer changes and engine speeds vary.
However, this applies only within the performance range of the A/C
compressor; if the performance limits of the A/C compressor are
exceeded, the temperature increases. Refer to
→ Chapter „Pressures, Checking“. |
3) |
Measured values for A/C systems with two evaporators |
Note
A/C compressors which do not regulate their performance are
switched off by the respective control module via the A/C
Compressor Regulator Valve -N280- at an evaporator temperature
below 0 °C (32 °F). |
In vehicles with A/C Compressor Regulator Valve -N280-, the
pressure is modified on the low pressure side by the valve. |
|
|
|
WARNING
When performing work on refrigerant circuit, observe
all generally applicable safety precautions and pressure
...
Arrows point in direction of refrigerant flow.
A-Low pressure side of refrigerant circuit.
B-High pressure side of refrigerant circuit.
...
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