Audi A2 2001 - Page 174

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Note
♦ If air conditioner operation is not OK when test is repeated,
install old expansion valve, clean refrigerant circuit (flush using
refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit Flushing With Refrigerant
R134a“, page 32 or blow through using compressed air and
nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit Flushing With Compressed Air
and Nitrogen “, page 29 ). Then replace A/C compressor and
reservoir.
♦ With this malfunction, evaporator may ice up although quantity
of refrigerant in circuit is OK.
Possible Deviation From Specifica‐
tion
Possible Cause Of Fault Corrective Action
• High and low pressure normal
• Required cooling output is not
attained
To much refrigerant oil in the cir‐
cuit.
– Discharge refrigerant circuit
– Clean refrigerant circuit (flush with
refrigerant R134a, refer to
⇒ “1.4.13 Refrigerant Circuit
Flushing With Refrigerant R134a“,
page 32 or blow through with com‐
pressed air and nitrogen, refer to
⇒ “1.4.12 Refrigerant Circuit
Flushing With Compressed Air
and Nitrogen “, page 29 ).
• High and low pressure normal
• A/C compressor noise (particu‐
larly after switch-on)
• The required cooling perform‐
ance is obtained
Note
♦ Overfilling with refrigerant oil can occur if, for example, the
compressor has been replaced without adjusting the quantity
of refrigerant oil.
♦ If there is too much refrigerant oil in the circuit, the compressor
must be drained and the accumulator must be replaced. After
cleaning the refrigerant circuit (flushing with refrigerant 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 ) the correct quantity of refrigerant oil
is filled into the circuit, refer to
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
170 Rep. Gr.00 - General, Technical Data