Volkswagen Polo Service & Repair 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
...
Indicators on pressure gauge
1 -
Temperature scale for refrigerant R134a CF3–CH2F or
CH2F–CF3.
2 -&nb ...
Other materials:
Switching the TCS on and off
Fig. 116 In the centre console: button
for switching the TCS on and off manually
First read and observe the introductory information
and safety warnings The electronic stability control (ESC) only
functions when the engine is running. It consists of ABS, EDL and TCS.
When the engine is r ...
Checking the electrolyte level of the vehicle battery
Fig. 141 In the engine compartment: removing
the vehicle battery cover
First read and observe the introductory information
and safety warningsThe electrolyte level of the vehicle battery should be
checked regularly in high-mileage vehicles, in hot countries and in older vehicle
batteries. ...
Introduction
This chapter contains information on the following subjects:
→ services
→ Applications (apps)
Information on the mobile online services Car-Net and applications (apps) can
be transmitted directly to your vehicle and integrated.
Information on Car-Net services and application ...
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Refrigerant Circuit with Expansion Valve
Pressure Gauge, Tests and Measurements