Audi A2 2001 - Page 186

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Possible deviation from speci‐
fication
Possible cause of fault Corrective action
• High pressure remains con‐
stant or increases only
slightly (above pressure
with engine stopped),
• Low pressure quickly drops
to value in graph or below
• Required cooling output is
not attained
♦ Actuation of A/C compressor regulator
valve -N280- malfunctioning
♦ Not enough refrigerant in refrigerant
circuit
♦ Expansion valve malfunctioning
– Check A/C compressor reg‐
ulator valve activation.
– Extract refrigerant from re‐
frigerant circuit
• If quantity of refrigerant ex‐
tracted is substantially less
than specified capacity:
• High pressure normal
• Low pressure in line with
value in graph
• Required cooling output is
not attained
– Localize leak with leak de‐
tector and eliminate
– Charge the refrigerant circuit
– Repeat test
• High pressure normal
• Low pressure too low (see
graph)
• Required cooling output is
not attained
• If quantity of refrigerant ex‐
tracted roughly corresponds
to specified capacity:
– Replace expansion valve
– Charge the refrigerant circuit
– Repeat test
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
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