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

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General information on refrigerant circuit<br />

Página 16 de 21<br />

.<br />

Note:<br />

- Installed in VW vehicles with A/C compressor driven via<br />

ribbed belt<br />

Evaporator Vent Temperature Sensor G263<br />

Function:<br />

Evaporator Vent Temperature Sensor G263 determines<br />

temperature behind the evaporator. This value is sent to<br />

A/C system control module and serves as a reference<br />

signal for A/C compressor regulation.<br />

Pressures and temperatures in refrigerant<br />

circuit<br />

Warning!<br />

When performing work on refrigerant circuit, observe<br />

all generally applicable safety precautions and<br />

pressure vessel regulations.<br />

The pressures and temperatures in refrigerant circuit are<br />

dependent on the current operating conditions (e.g. engine<br />

RPM, coolant fan stage 1, 2 or 3, engine temperature, A/C<br />

compressor on or off) as well as on the effects of ambient<br />

influences (e.g. ambient temperature, humidity, requested<br />

cooling output).<br />

In vehicles with A/C Compressor Regulator Valve N280 ,<br />

pressure is modified on the low pressure side by the valve.<br />

For this reason, values indicated in the following table are<br />

valid only as reference points. They are attained at an<br />

engine speed of 1500 to 2000 RPM and an ambient<br />

temperature of 20 C after about 20 minutes.<br />

The connections for the pressure gauge set intended for<br />

the pressure measurement are indicated on the vehicle<br />

specific refrigerant circuit.<br />

<strong>Repair</strong> Manual, Heating & Air Conditioning, <strong>Repair</strong><br />

Group 87 ,<br />

At 20<br />

C with the engine not running, the pressure in the<br />

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

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

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