VW Golf manuals

Volkswagen Golf Service & Repair Manual: Checking

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.
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.


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.
Test prerequisites
Radiator and condenser must be clean (clean them if necessary). The V-belt for air conditioner compressor and alternator is correct ...

Checking systems with a restrictor and reservoir and air conditioner compressor regulating valve -N280- (with externally regulated air conditioner compressor)
  Note Connecting air conditioner service station → Chapter. Observe the test prerequisites → Cha ...

Other materials:

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Without needing to purge refrigerant circuit of contaminants (cleaning), e.g. in cases of external damage after an accident
Drain refrigerant circuit. –  Remove air conditioner compressor.   Note If a different air conditioner compressor with other refrigerant oil is fitted, purge the refrigerant circuit with R134a r ...

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