Audi A2 2001 - Page 182

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Possible deviation from spec‐
ification
Possible cause of fault Corrective action
• High and low pressure
normal.
• A/C compressor noise
(particularly after switch-
on).
• The required cooling per‐
formance is obtained
– 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 ).
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 .
4.4.10 Checking Pressures On Vehicles with
Restrictor, Accumulator and A/C Com‐
pressor Regulator Valve - Externally
Regulated Compressor
Note
♦ Connecting service station. Refer to
⇒ “2.4 A/C Service Station“, page 79 .
♦ Observe test requirements. Refer to
⇒ “4.4 Pressures, Checking“, page 153 .
♦ If a malfunction occurs at only one evaporator in vehicles with
two evaporators, also check pressures in the refrigerant cir‐
cuit, are these OK? Check line connection between evapora‐
tor in question and exit of line connection at distribution point
of refrigerant lines (for constriction). If no malfunction can be
detected, discharge refrigerant circuit and charge it with the
specified refrigerant quantity. Then check pressures and cool‐
ing performance of A/C system again; if the malfunction occurs
again, replace the expansion valve which is prematurely
switched by the malfunctioning evaporator. Refer to ⇒ Heat‐
ing, Ventilation and Air Conditioning; Rep. Gr. 87 ; Diagnosis
and Testing (vehicle-specific repair manual).
– Refrigerant circuit, checking pressure with service station, re‐
fer to
⇒ “4.4.1 Checking Pressure with Service Station“, page 153 .
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
178 Rep. Gr.00 - General, Technical Data