VW Polo manuals

Volkswagen Polo Service & Repair Manual: Checking

–  Turn off the ignition.
–  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.
–  Start the engine.
–  Set A/C system to maximum cooling output.
–  Open doors.
–  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:
   
Specified Values
High-pressure side:
Increasing from pressure with engine not running to a maximum of 20 bar (290 psi).
Low-pressure side:
Decreasing from pressure with engine not running down to 1.3 bar (18.9 psi).
Test Requirements
Radiator and condenser are clean (clean if necessary). The ribbed belt for the A/C compressor and alternator tensioned correctly. ...

Checking with Restrictor, Reservoir and A/C Compressor Regulator Valve -N280-, Externally Regulated A/C Compressor
  Note Connecting service station. Refer to → Chapter „Connecting Service Station“. Observe test requirements ...

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