Audi A2 2001 - Page 179

Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Possible deviation from spec‐
ification
Possible cause of fault Corrective action
♦ Constriction or obstruction in re‐
frigerant circuit (for example, in‐
side the refrigerant line between
the Service connection “low pres‐
sure side“ and the A/C compres‐
sor).
– Clean refrigerant circuit (flush with
refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit Flush‐
ing With Refrigerant R134a“,
page 32 or blow through with com‐
pressed air and nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit Flush‐
ing With Compressed Air and Nitro‐
gen “, page 29 ).
– Replace hose or pipe if kinked or
constricted
♦ A/C compressor faulty. – Replace A/C compressor.
Possible deviation from spec‐
ification
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 attained
♦ Actuation of A/C compressor reg‐
ulator valve -N280- malfunction‐
ing
♦ Constriction or obstruction in re‐
frigerant circuit
– Check the A/C compressor regulator
valve activation.
– Run hand over refrigerant circuit to
check for differences in temperature
• If difference in temperature is found
at one component:
– Replace hose or pipe if kinked or
constricted
– In the event of an obstruction, flush
refrigerant circuit with compressed
air and nitrogen.
• If no malfunction can be found:
– Clean refrigerant circuit (flush with
refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit Flush‐
ing With Refrigerant R134a“,
page 32 or blow through with com‐
pressed air and nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit Flush‐
ing With Compressed Air and Nitro‐
gen “, 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 175