Audi A2 2001 - Page 170

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Possible Devia‐
tion From
Specification
Possible Cause Of
Fault
Corrective Action
• High pres‐
sure does
not increase
or only in‐
creases
slightly
above pres‐
sure with
engine stop‐
ped.
• Low pres‐
sure does
not drop or
drops only
slightly.
• Required
cooling out‐
put is not at‐
tained
♦ The A/C com‐
pressor does not
activate (the
magnetic clutch).
♦ The A/C com‐
pressor is not be‐
ing driven.
– Check the A/C com‐
pressor drive. Refer
to ⇒ Heating, Venti‐
lation and Air Condi‐
tioning; Rep. Gr. 87 ;
Diagnosis and Test‐
ing .
♦ Constriction or
obstruction in re‐
frigerant circuit
(for example, in‐
side the refriger‐
ant line between
the Service con‐
nection low pres‐
sure side and the
A/C compres‐
sor).
– Clean refrigerant cir‐
cuit (flush with refrig‐
erant R134a, refer to
⇒ “1.4.13 Refrigerant
Circuit Flushing With
Refrigerant R134a“,
page 32 or blow
through with com‐
pressed air and nitro‐
gen, refer to
⇒ “1.4.12 Refrigerant
Circuit Flushing With
Compressed Air and
Nitrogen “, page 29 ).
– Replace hose or pipe
if kinked or constric‐
ted
♦ A/C compressor
faulty.
– Replace A/C com‐
pressor.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
166 Rep. Gr.00 - General, Technical Data