Volkswagen Golf Service & Repair Manual: Refrigerant circuit with expansion valve
| 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-
evaporator, from inlet to outlet |
Vapour |
approx. 1.2 bar
→ Remark |
approx. -7°C
→ Remark |
| |
|
(approx. 1.8 bar)
→ Remark |
approx. -1°C
→ Remark |
| -2-
Air conditioning system compressor A-side |
Gas |
approx. 1.2 bar
→ Remark |
approx. -1°C |
| |
|
(approx. 1.8 bar)
→ Remark |
(approx. +1°C)
→ Remark |
| -3-
Air conditioning system compressor B-side |
Gas |
approx. 14 bar |
approx. +65°C |
| -4-
Condenser |
Gas, vapour, liquid |
approx. 14 bar |
at outlet approx. + 55°C |
| -5-
Receiver |
Liquid |
approx. 14 bar |
approx. +55°C |
| -6-
Extraction and charging valve, B side |
Liquid |
approx. 14 bar |
approx. +55°C |
| -7-Expansion
valve |
Liquid, released into
vapour |
approx. 14 bar |
approx. +55°C, reduced to -7°C |
| -8-
Extraction and charging valve, A side |
Gas |
approx. 1.2 bar
→ Remark |
approx. -7°C
→ Remark |
| |
|
(approx. 1.8 bar)
→ Remark |
approx. -1°C
→ Remark |
| 1) |
The pressure in refrigerant circuits with regulating air
conditioner compressor is held to approx. 2 bar despite changing heat
transport and 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. |
| 2) |
The temperature in refrigerant circuits with regulating
air conditioner compressor is held within the regulation range of the
air conditioner compressor despite changing heat transport and 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 temperature will increase.
→ Chapter |
| 3) |
Measured values for air conditioning systems with two
evaporators |
 Note
| Air conditioning system compressors that do not
self-regulate their load are switched off by the respective
control unit via the air conditioner compressor regulating valve
-N280- when an evaporator temperature less than 0°C is sensed. |
| In vehicles with air conditioner compressor regulating valve
-N280-, the pressure on the low-pressure side is varied by
activating the valve. |
|
|
|
WARNING
When working on the refrigerant circuit, observe
generally applicable safety rules and the Regulations
for ...
Arrows show the direction of refrigerant flow.
A- low-pressure side of the refrigerant circuit.
B- high-pressure side of the refrigerant circuit.
...
Other materials:
Removing and installing wiper blade
Caution
Risk of damage to the wiper blade.
Joint-free wipers are very flexible. To lift the
wiper blades off the rear window, touch them only in the
area in which the wiper blades a ...
Fault in the function of the automatic gearbox
First read and observe the introductory information
and safety warnings Emergency programme
There is a fault in the system if all the displays on the instrument cluster
for the selector lever positions have a light background. The automatic gearbox
is running in an emergency programme. The ...
Absorbent glass mat battery
Maintenance-free battery with a contained electrolyte and no
colour indicator
Lead-acid battery where the electrolyte is contained within
a microscopic glass mat (AGM). The battery is sealed and fitted
with valves.
...
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Pressures and temperatures in the refrigerant circuit
Refrigerant circuit with restrictor and reservoir