Volkswagen Polo Service & Repair Manual: Checking
| – |
Connect pressure gauge battery (A/C service station). |
| – |
Take pressure gauge readings. There are two possible results
A and B. |
|
|
|
| Ambient
Temperature in °C (°F) |
Pressure in
Refrigerant Circuit in Bar (psi) Positive Pressure |
| 15 (60) |
3.9 (57) |
| 20 (68) |
4.7 (68) |
| 30 (86) |
6.7 (97) |
| 40 (104) |
9.1 (132) |
| A- The pressure in the refrigerant circuit is lower than the
pressure specified in the table. There is not enough refrigerant
in the circuit. |
| - Search for leak with leak detection device. |
| - The pressure release valve is open, check coolant fan
activation according to the wiring diagram. |
| Check refrigerant pipes and hoses to see if they are bent
too sharply (cross-section constrictions) or have external
damage. If no malfunction is found, flush refrigerant circuit. |
| B - The pressure in the refrigerant circuit matches the
table or is higher. |
| – |
Set A/C system to maximum cooling output. |
| – |
Open vents in instrument panel. |
| The A/C compressor is driven by the engine via the magnetic
clutch using the ribbed belt. |
 Note
| If the A/C compressor is not driven, check A/C Clutch -N25-
voltage supply. |
| If the voltage supply is OK, repair the magnetic clutch. |
| If the A/C compressor is driven, check refrigerant circuit: |
| – |
Bring engine speed up to 2000 RPM. |
| – |
Observe manometer battery: |
|
|
|
| Increasing from pressure with engine not running to a
maximum of 20 bar (290 psi). |
| Decreasing from pressure with engine not running down to 1.3
bar (18.9 psi). |
|
Radiator and condenser are clean (clean if necessary).
The ribbed belt for the A/C compressor and alternator
tensioned correctly.
...
Note
Connecting service station. Refer to
→ Chapter „Connecting Service Station“.
Observe test requirements ...
Other materials:
Cleaning and caring for the deck stripes
First read and observe the introductory information
and safety warningsDeck stripes are a design feature and are made up of soft
polyvinyl chloride (PVC).
In the areas of the vehicle where there are deck stripes, the underlying paint
layer is protected from weather and environmental condition ...
Autogas
Fig. 133 In the upper section of the centre
console: switch for Autogas
First read and observe the introductory information
and safety warnings When the vehicle is restarted, the last
manually selected operating mode will be adopted automatically. If, for example,
autogas mode was activa ...
Evaporator Vent Temperature Sensor -G263- or Evaporator Temperature Sensor
-G308
Function:
The Evaporator Vent Temperature Sensor -G263- or Evaporator
Temperature Sensor -G308- determines the temperature behind the
evaporator. This value goes to the air conditioning control
module and serves as a reference signal for ...
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Test Requirements
Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve
-N280-, Externally Regulated A/C Compressor