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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 16 de 33<br />

Note the following points when<br />

engine is running and A/C system<br />

set to maximum cooling output:<br />

- Fresh air blower running.<br />

- Coolant fan in operation or is<br />

switched on.<br />

- Recirculating/fresh air door in<br />

"recirculating air" position.<br />

- Ambient temperature greater<br />

than 15 0 C.<br />

- A/C Evaporator Temperature<br />

Switch E33 is correctly installed<br />

and its switching temperatures are<br />

OK.<br />

Checking<br />

- Switch ignition off.<br />

- Connect pressure gauge set<br />

(service station).<br />

- Take pressure gauge reading.<br />

Two results A and B can be<br />

displayed.<br />

Ambient temperature in degrees<br />

Celsius<br />

Pressure in refrigerant circuit in bar positive<br />

pressure<br />

+15 C 3.9<br />

+20 C 4.7<br />

+30 C 6.7<br />

+40 C 9.1<br />

- A- Pressure in refrigerant circuit<br />

is lower than indicated in the table,<br />

not enough refrigerant in circuit.<br />

- Localize leak using leak detector.<br />

- Pressure relief valve opened,<br />

check activation for coolant fan<br />

according to wiring diagram.<br />

Check for constricted refrigerant<br />

pipe and hose cross-sections<br />

caused by inadequate bending<br />

radii or external damage. If no<br />

malfunction can be found, flush<br />

refrigerant circuit.<br />

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

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

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