Volkswagen Golf Quiz
Air conditioning system with refrigerant R134a

Checking

In this manual: Air conditioning system with refrigerant R134a
General body repairs, exterior — 230General body repairs, interior — 279General information, paint — 133Vechile- specific paint information — 27Heating, air conditioning — 156Auxiliary heater — 58Air conditioning system with refrigerant R134a — 1297- speed dual clutch gearbox 0CW — 544- cylinder injection engine(1.4 1 direct inction. turbocharger) — 182Fuel supply system - Petrol engines — 59Running gear, axles, steering — 221Brake system — 92Wheels and Tyres guide — 12Guide for using trailers — 11Wheels and Tyres Guide - General Information — 121Brake system (hybrid) — 73Electrical system — 326Communication — 65Electrical system, general information — 111
~2min read

Switch off ignition.

  • Connect manifold gauge (air conditioner service station).
  • Read pressure gauge. It may display two results, A and B.
Ambient temperature in degrees centigrade Pressure in the refrigerant circuit in bar positive pressure
+15 °C 3.9
+20 °C 4.7
+30 °C 6.7
+40 °C 9.1
A- The pressure in the refrigerant circuit is less than shown in the table, (insufficient refrigerant in the circuit).

- Check for leaks using leak detector.

- The high-pressure safety valve has opened; check the activation for the radiator fan referring to the current flow diagram. Check refrigerant pipes and refrigerant hoses for bends that have too tight radius (restrictions in cross-section) and for external damage. If no faults are found, purge the refrigerant circuit. B- The pressure in the refrigerant circuit is greater than or equal to the value in the table.
  • Start engine.
  • Set air conditioning system to maximum cooling power.
  • Open doors.
  • Open vents in dash panel.
The air conditioner compressor is driven by the engine, via the V-belt and magnetic clutch. Note If the air conditioner compressor is not being driven, check the power supply for the air conditioning system magnetic clutch -N25- in accordance with the current flow diagram.

If power supply is OK, repair magnetic clutch.

If the air conditioner compressor is not being driven, check the refrigerant circuit:
  • Raise engine speed to 2,000 rpm.
  • Observe the manifold gauge.

Specifications

High-pressure side:

Increasing from the pressure when the engine is stopped to a maximum of 20 bar positive pressure.

Low-pressure side:

Decreasing from the pressure when the engine is stopped to 1.3 bar positive pressure.

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