Audi A2 2001 - Page 168

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Possible Deviation From Specifica‐
tion
Possible Cause Of Fault Corrective Action
• 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 .
4.4.6 Checking Pressures On Vehicles With
Expansion Valve and Fluid Reservoir -
Internally 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 .
– Refrigerant circuit, checking pressure with service station, re‐
fer to
⇒ “4.4.1 Checking Pressure with Service Station“, page 153 .
The pressures with the ignition turned off meet the specifications.
– Start the engine.
– Set engine speed to 2000 RPM.
– Observe pressure gauge of service station.
Note
♦ Switching pressures and design of refrigerant circuit switches
are vehicle-specific.
♦ Pressures must be measured at service connections; compo‐
nent locations of these connections are vehicle-specific. Refer
to ⇒ Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ;
Diagnosis and Testing (vehicle-specific repair manual).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
164 Rep. Gr.00 - General, Technical Data