Audi A2 2001 - Page 178

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Possible deviation from
specification
Possible cause of fault Corrective action
• High pressure remains
constant or increases on‐
ly slightly (above pres‐
sure with engine stop‐
ped),
• Low pressure quickly
drops to value in graph or
below
• Required cooling output
is not attained
♦ Actuation of A/C compressor reg‐
ulator valve -N280- malfunction‐
ing
♦ Not enough refrigerant in refrig‐
erant circuit
– Check the A/C compressor regulator
valve activation.
– Localize leak with leak detector and
eliminate
– Charge the refrigerant circuit
• High pressure normal
• Low pressure too low
(see graph)
• Required cooling output
is not attained
• High pressure normal
• Low pressure too low
(see graph)
• Required cooling output
is not attained
Note
If no fault is found with this complaint, clean refrigerant circuit
(flush using refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit Flushing With Refrigerant R134a“,
page 32 or blow through using compressed air and nitrogen, refer
to
⇒ “1.4.12 Refrigerant Circuit Flushing With Compressed Air and
Nitrogen “, page 29 ).
Possible deviation from spec‐
ification
Possible cause of fault Corrective action
• High pressure does not in‐
crease or only increases
slightly above pressure
with engine stopped.
• Low pressure does not
drop or drops only slightly.
• Required cooling output is
not attained
♦ The A/C compressor is not acti‐
vated ( A/C compressor regulator
valve -N280- )
♦ The A/C compressor is not being
driven.
– Check the A/C compressor drive.
Refer to ⇒ Heating, Ventilation and
Air Conditioning; Rep. Gr. 87 ; Di‐
agnosis and Testing .
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
174 Rep. Gr.00 - General, Technical Data