Volkswagen Golf 1999 Service Manual page 4061

Pressures, checking on vehicles
- High pressure normal, low
pressure too low (see graph),
required cooling output attained.
Note:
- For the malfunction "high
pressure normal, low pressure too
low" , note the following: If
malfunctioning, evaporator may
ice-up or cooling output is not
reached.
- With this malfunction, evaporator
may ice up although quantity of
refrigerant in circuit is OK.
- Check measured values of
Evaporator Vent Temperature
Sensor G263 and activation of A/C
Compressor Regulator Valve
N280 . If measured value of High
Pressure Sensor G65 is not OK,
evaporator may ice up or cooling
output is not attained.
- If the problem is with the A/C
Compressor Regulator Valve
N280 (regulating valve is not
actuated but compressor operates
nevertheless), refrigerant circuit
does not have to be flushed. It is
sufficient in this case to replace
the compressor (adjust quantity of
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- Activation of A/C Compressor
Regulator Valve N280
malfunctioning.
- Expansion valve or compressor
malfunctioning.
- A/C compressor malfunctioning. - Discharge refrigerant circuit.
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- Check activation of
Compressor Regulator Valve
N280 .
- Discharge refrigerant circuit.
- Flush refrigerant circuit with
compressed air and nitrogen.
- Replace expansion valve and
receiver.
- Re-charge refrigerant circuit.
- Repeat test, if function is not
- Replace A/C compressor.
- Re-charge refrigerant circuit.
- Repeat test.
13/2/2005