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 ...

Other materials:

Introduction
This chapter contains information on the following subjects:  → The dangers of assuming an incorrect sitting position  → Correct sitting position  → Mechanical controls on the front seats  → Adjusting the head restraints  → Removing and fitting head restra ...

Special Tools
Special tools and workshop equipment required     Battery Charger -VAS5903-   Battery Tester -VAS6161-   ...

Searching for Refrigerant Circuit Leaks with Compressed Air or Nitrogen
  Note This repair manual describes different methods for detecting leaks in the refrigerant circuit. These methods have been tested and result in success when used correctly. If when searching for compressed air / Nit ...

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