Amarok 2011 ➤ , Beetle 2012 ➤ , Bora 1999 ➤ , CC 2010 ➤ , CC 2012 ➤ , ...
Air conditioning system with refrigerant R134a - Edition 10.2014
With the engine running and the air conditioning system set to full
power, check the following points:
•
•
•
•
The fresh air blower is running
The radiator fan is running or is switched on.
The fresh air and air recirculation flap is set to “recirculate”.
o
The ambient temperature is more than 15 C.
•
The temperature switch for evaporator - E33- is correctly fitted
and its switching temperatures are correct.
10.4.2
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 de‐
grees centigrade
Pressure likn the refrigerant cir‐
cuit in bar positive pressure
+15℃
+20 ℃
+30 ℃
+40 ℃
3.9
4.7
6.7
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.
142
Rep. gr.00 - Technical data
English 
