Volkswagen Golf Service & Repair Manual: Checking
| – |
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. |
| – |
Set air conditioning system to maximum cooling power. |
| – |
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
| Increasing from the pressure when the engine is stopped to a
maximum of 20 bar positive pressure. |
| Decreasing from the pressure when the engine is stopped to
1.3 bar positive pressure. |
|
Radiator and condenser must be clean (clean them if
necessary).
The V-belt for air conditioner compressor and alternator is
correct ...
Note
Connecting air conditioner service station
→ Chapter.
Observe the test prerequisites
→ Cha ...
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Test prerequisites
Checking systems with a restrictor and reservoir and air conditioner
compressor regulating valve -N280- (with externally regulated air conditioner
compressor)