Volkswagen Polo Quiz
Refrrigerant R134a Servicing

Checking

In this manual: Refrrigerant R134a Servicing
General Paint Information — 128Towing Guide — 10Whels, Tires, Whel Alignment — 126Battery, Starter, Generator, Cruise Control — 65Windshield Wiper/ Washer System — 9Exterior Lights, Switches — 1Interior Lights, Switches — 7Wiring — 51Refrrigerant R134a Servicing — 134
~1min read

  • 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).

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