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.
...
Other materials:
Frequently asked questions
If you suspect that there is a fault in the vehicle or if your vehicle has
been damaged, read and observe the following information before
contacting a Volkswagen dealership or qualified workshop. You may also find
useful information in the index under the headings Things to note or Checklist. ...
Introduction
This chapter contains information on the following subjects:
→ Fuses in the vehicle
→ Changing a blown fuse
At the time of print we are unable to provide an up-to-date overview of the
locations of the fuses for the electrical consumers. This is because the vehicle
is under co ...
A/C Service Station, Emptying
Caution
If it is suspected that chemicals were added to the
refrigerant circuit to seal leaks, do not connect the
A/C service station and do not extract the refrigerant.
...
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Refrigerant Circuit Pressures and Temperatures
Refrigerant Circuit with Restrictor and Reservoir