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:
Battery Charger -VAS5095A- Maintenance Charging
WARNING
Risk of injury. Follow all Warnings and Safety
Precautions. Refer to
→ Chapter „Warnings and Safety Precautions“.
WARNING ...
Wheel, Balancing on Stationary Balancing Machine
Before beginning balancing, the following requirements must
be fulfilled.
The tire pressure must be OK.
The tire profile must not be worn on one side. The tire
profile must be at least 4 mm.
...
Hill Hold Assist
First read and observe the introductory information
and safety warnings The Hill Hold Assist function actively holds
the vehicle when pulling away on an incline.
The Hill Hold Assist function is automatically activated if the following conditions
are met
Cond ...
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Test Requirements
Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve
-N280-, Externally Regulated A/C Compressor