Audi A2 2001 - Page 165

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Possible Deviation From Specifica‐
tion
Possible Cause Of Fault Corrective Action
• High pressure does not increase
or only increases slightly above
pressure with engine stopped.
• Low pressure does not drop or
drops only slightly.
• Required cooling output is not at‐
tained
♦ The A/C compressor does not
activate (the magnetic clutch).
♦ The A/C compressor is not be‐
ing driven.
– Check the A/C compressor
drive. Refer to ⇒ Heating, Ven‐
tilation and Air Conditioning;
Rep. Gr. 87 ; Diagnosis and
Testing .
♦ Constriction or obstruction in
refrigerant circuit (for example,
inside the refrigerant line be‐
tween the Service connection
“low pressure side“ and the A/
C compressor).
– Clean refrigerant circuit (flush
with refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit
Flushing With Refrigerant
R134a“, page 32 or blow
through with compressed air
and nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit
Flushing With Compressed Air
and Nitrogen “, page 29 ).
– Replace hose or pipe if kinked or
constricted
♦ A/C compressor faulty. – Replace A/C compressor.
Possible Deviation From Specifica‐
tion
Possible Cause Of Fault Corrective Action
• High pressure increases above
specification
• Low pressure quickly drops to
value in graph or below
• Required cooling output is not at‐
tained
Constriction or obstruction in re‐
frigerant circuit
– Run hand over refrigerant circuit
to check for differences in tem‐
perature
• If difference in temperature is
found at one component:
– Replace hose or pipe if kinked or
constricted
– In the event of an obstruction,
clean refrigerant circuit (flush
with refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit
Flushing With Refrigerant
R134a“, page 32 or blow
through with compressed air
and nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit
Flushing With Compressed Air
and Nitrogen “, page 29 ).
• If no malfunction can be found:
– Clean refrigerant circuit (flush
with refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit
Flushing With Refrigerant
R134a“, page 32 or blow
through with compressed air
and nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit
Flushing With Compressed Air
and Nitrogen “, page 29 ).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
4. Diagnosis and Testing 161