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:
Indicator lamp for the tyre monitoring system
First read and observe the introductory information
and safety warnings
Lit up
Possible cause
Solution
The
tyre pressure of one tyre or several tyres has decreased considerably in
comparison to the tyre pressure set by ...
Masking or switching over headlights for driving abroad (travel mode)
First read and observe the introductory information
and safety warnings
If you have to drive a right-hand drive vehicle in a left-hand drive country,
or vice versa, the asymmetric dipped beam headlights may dazzle oncoming traffic.
Therefore, the headlights must be masked or switched over if ...
Tire Pressure Sensor and Metal Valve, Removing and Installing
Special tools and workshop equipment
required
Torque Wrench 1410 -VAG1410- and Torque Wrench 1331 5-50Nm
-VAG1331-
–
Place metal valve with rubber seal through rim from inside.
...
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Refrigerant Circuit with Expansion Valve
Pressure Gauge, Tests and Measurements