Audi A2 2001 - Page 189

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Possible deviation from spec‐
ification
Possible cause of fault Corrective action
• High pressure increases
above specification
• Low pressure quickly
drops to value in graph
• Required cooling output is
not attained
♦ Actuation of A/C compressor reg‐
ulator valve -N280- malfunction‐
ing
♦ Constriction or obstruction in re‐
frigerant circuit
♦ Expansion valve malfunctioning
– 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, clean
refrigerant circuit (flush with refriger‐
ant 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 ).
– Charge the refrigerant circuit
– Repeat test
• 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 )
– Charge the refrigerant circuit
– Repeat test, if function is not OK:
– Replace expansion valve and re‐
ceiver
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
4. Diagnosis and Testing 185