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Note
♦
For the malfunction “high pressure normal, low pressure too
low“ With this malfunction, evaporator may ice up or the Low
pressure switch -F73- turns off the A/C compressor, although
quantity of refrigerant in circuit is OK.
♦
On the Audi 100, Audi A6 (up to model year 1997) and Audi
V8, this fault may result in compressor being shut off by control
head (if temperature at fresh-air blower drops below -3 °C) ⇒
Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ; Diag‐
nosis and Testing .
Possible Deviation From Specifica‐
tion
Possible Cause Of Fault Corrective Action
• High pressure normal or too high
• Low pressure too high (see
graph)
• A/C compressor noise (particu‐
larly after switch-on)
• Required cooling output is not at‐
tained
To much refrigerant in the circuit. – Extract refrigerant
from refrigerant cir‐
cuit
• If quantity of refriger‐
ant extracted roughly
corresponds to
specified capacity:
– Replace A/C com‐
pressor.
• If quantity of refriger‐
ant extracted is sub‐
stantially greater
than specified ca‐
pacity:
– Charge the refriger‐
ant circuit
– Repeat test
Possible Deviation From Specifica‐
tion
Possible Cause Of Fault Corrective Action
• High and low pressure normal
• Required cooling output is not at‐
tained
To much refrigerant oil in the circuit. – Discharge refriger‐
ant circuit
– Clean refrigerant
circuit (flush with re‐
frigerant R134a, re‐
fer to
⇒ “1.4.13 Refriger‐
ant Circuit Flushing
With Refrigerant
R134a“, page 32 or
blow through with
compressed air and
nitrogen, refer to
⇒ “1.4.12 Refriger‐
ant Circuit Flushing
With Compressed
Air and Nitrogen “,
page 29 ).
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
4. Diagnosis and Testing 163
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