Skoda Citigo 2012 Workshop Manual page 85

Note
If problems arise due to humidity in the refrigerant circuit, only
♦
after a longer operating time or only occasionally (the low
pressure drops below the specified value and the evaporator
ices up), it is adequate to replace the dessicator (the volume
of refrigerant oil must be adapted). Subsequently the refriger‐
ant circuit must be evacuated for at least 3 hours.
First of all, it is not required to clean the refrigerant circuit for
♦
this complaint (to flush with refrigerant R134a or to blow
through with compressed air and nitrogen), as normally only
a small amount of humidity is present in the system which can
be removed through a longer period of evacuation.
Possible deviation from the specified value
• High pressure is normal or too high,
• Low pressure is too high (see diagram),
• The required cooling capacity is not
reached,
• the AC compressor makes noises (es‐
pecially after switching it on).
Note
If the function of the air conditioning system is not O.K. when re‐
peating the test, re-exchange expansion valve and clean refrig‐
erant circuit
⇒ "7 Removing contaminants from the refrigerant circuit",
page 52 . Subsequently replace AC compressor and fluid reser‐
voir with dessicator or only dessicator (specifically designed for
vehicles).
Citigo 2012 ➤ , Fabia 2000 ➤ , Fabia II 2007 ➤ , Fabia II 2009 ➤ , Fab ...
Air conditioning system with refrigerant R134a - Edition 10.2014
Possible cause of fault
♦ Too much refrigerant in the
circuit.
♦ Expansion valve or AC
compressor defective.
9. Check the pressure in the refrigerant circuit (with the A/C service station)
Rectifying fault
– Drain the refrigerant from
the refrigerant circuit.
• The volume of refrigerant
suctioned out corresponds
approximately to the speci‐
fied filling capacity:
– Replace expansion valve.
– Newly filling the refrigerant
circuit.
– Repeat check.
• The volume of refrigerant
suctioned out is considera‐
bly more than the specified
filling capacity:
– Newly filling the refrigerant
circuit.
– Repeat check.
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