Audi A2 2001 - Page 171

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Possible Deviation From
Specification
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
♦ Constriction or obstruction in refrig‐
erant circuit
♦ Expansion valve malfunctioning
– Run hand over refrigerant circuit to
check for differences in tempera‐
ture
• 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 refrig‐
erant 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 and replace expan‐
sion valve if necessary).
• 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 and replace expan‐
sion valve if necessary).
– Repeat test
Note
If operation is not OK after cleaning refrigerant circuit (flushing
with R134a, refer to
⇒ “1.4.13 Refrigerant Circuit Flushing With Refrigerant R134a“,
page 32 or blowing through using compressed air and nitrogen,
refer to
⇒ “1.4.12 Refrigerant Circuit Flushing With Compressed Air and
Nitrogen “, page 29 ), expansion valve must be replaced.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
4. Diagnosis and Testing 167