Skoda Citigo 2012 Workshop Manual page 92

Citigo 2012 ➤ , Fabia 2000 ➤ , Fabia II 2007 ➤ , Fabia II 2009 ➤ , Fab ...
Air conditioning system with refrigerant R134a - Edition 10.2014
Possible deviation from the specified value Possible cause of fault
• High pressure is normal,
• Low pressure is too low (see diagram),
• the required cooling capacity is
reached.
Note
In the event of the error "High pressure normal, low pressure
♦
too low" please observe the following: If this fault occurs, it can
happen that the evaporator ices up although the volume of
refrigerant in the circuit is O.K.
If the fault occurs on the regulating valve for compressor of air
♦
conditioning system - N280- (the regulating valve is not actu‐
ated and the AC compressor however keeps running) it is not
required to clean the refrigerant circuit (flush with refrigerant
R134a or blow through with compressed air and nitrogen). If
this fault occurs, it is sufficient to replace the AC compressor
(adapt the volume of refrigerant oil in the new AC compressor
⇒ "10.4 Replace AC compressor", page 93
If the expansion valve is defective (it is closed constantly or it
♦
does not open up wide enough) the regulating valve for com‐
pressor of air conditioning system - N280- is actuated to
maximum performance and the low pressure drops to the di‐
agram value or lower (the AC compressor suctions the refrig‐
erant out of the low pressure side). As no refrigerant can flow
through the expansion valve, the cooling capacity is not
reached, perhaps the high pressure does not rise or only rises
slightly because no energy turnover exists.
Due to a fault on the evaporator vent temperature sender -
♦
G263- the refrigerant circuit can also ice up. Also observe the
measured value of this sender ⇒ Vehicle diagnostic tester
88
Rep. gr.00 - Technical data
♦ The actuation of the regu‐
lating valve for compressor
of air conditioning system -
N280- is incorrect.
♦ Expansion valve or AC
compressor defective.
).
Rectifying fault
– Check the actuation of the
regulating valve for com‐
pressor of air conditioning
system - N280- .
– Clean the refrigerant circuit.
⇒ "7 Removing contami‐
nants from the refrigerant
circuit", page 52 , if neces‐
sary replace expansion
valve and fluid reservoir
with dessicator or only des‐
sicator (specifically de‐
signed for vehicles) see
notes.
– Repeat the test after refill‐
ing the circuit.
– If the function is N.O.K., re‐
place A/C compressor.