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:
Rain/light sensor
Fig. 75 Windscreen wiper lever: setting
the rain/light sensor Ⓐ
Fig. 76 Sensitive surface of the rain/light
sensor
First read and observe the introductory information
and safety warnings
When the rain/light sensor is activated, it automatically controls the frequency
of the wiper inte ...
Cleaning wheels
First read and observe the introductory information
and safety warningsCleaning steel wheels
An industrial cleaner is needed to remove accumulated brake dust. Steel wheels
should therefore be cleaned regularly with a separate sponge.
Any damage to the paint on steel wheels should be touched u ...
Introduction
This chapter contains information on the following subjects:
→ Warning lamp
→ Checking the electrolyte level of the vehicle battery
→ Charging, replacing, disconnecting and connecting the vehicle battery
The vehicle battery is a component of the electrical system in t ...
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Test Requirements
Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve
-N280-, Externally Regulated A/C Compressor