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Bentley Volkswagen.Golf.Jetta.R32.Official.Factory.Repair.Manual.1999-2005

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Pressures, checking on vehicles<br />

Página 30 de 33<br />

- High pressure normal, low<br />

pressure too low (see graph),<br />

required cooling output attained.<br />

- Activation of A/C Compressor<br />

Regulator Valve N280<br />

malfunctioning.<br />

- Expansion valve or compressor<br />

malfunctioning.<br />

- Check activation of<br />

Compressor Regulator Valve<br />

N280 .<br />

- Discharge refrigerant circuit.<br />

- Flush refrigerant circuit with<br />

compressed air and nitrogen.<br />

- Replace expansion valve and<br />

receiver.<br />

- Re-charge refrigerant circuit.<br />

- Repeat test, if function is not<br />

- A/C compressor malfunctioning. - Discharge refrigerant circuit.<br />

- Replace A/C compressor.<br />

- Re-charge refrigerant circuit.<br />

- Repeat test.<br />

Note:<br />

- For the malfunction "high<br />

pressure normal, low pressure too<br />

low" , note the following: If<br />

malfunctioning, evaporator may<br />

ice-up or cooling output is not<br />

reached.<br />

- With this malfunction, evaporator<br />

may ice up although quantity of<br />

refrigerant in circuit is OK.<br />

- Check measured values of<br />

Evaporator Vent Temperature<br />

Sensor G263 and activation of A/C<br />

Compressor Regulator Valve<br />

N280 . If measured value of High<br />

Pressure Sensor G65 is not OK,<br />

evaporator may ice up or cooling<br />

output is not attained.<br />

- If the problem is with the A/C<br />

Compressor Regulator Valve<br />

N280 (regulating valve is not<br />

actuated but compressor operates<br />

nevertheless), refrigerant circuit<br />

does not have to be flushed. It is<br />

sufficient in this case to replace<br />

the compressor (adjust quantity of<br />

http://ebahn.bentleypublishers.com/vw/servlet/Display?action=Next&type=repair&id=...<br />

13/2/<strong>2005</strong>

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