System Performance Test

Fig. 5 Air Conditioning Performance Test Chart. 1991-92 NX 1600, NX 2000 & Sentra:

1. Vehicle should be located in a shaded, well ventilated area.
2. Close all doors and leave drivers window open.
3. Open vehicle hood and connect gauge set to A/C system.
4. Insert a thermometer in the vent outlet, then determine relative humidity and ambient air temperature.
5. Position temperature lever to ``Cold,'' mode door to ``Vent,'' intake door to ``Recirc'' and fan speed to ``Max.''
6. Start engine and run at 1500 RPM for at least 10 minutes.
7. Compare discharge air temperature, high pressure reading and low pressure reading with the charts in Fig. 5.

_�f:

SIGHT GLASS INSPECTION FOR SYSTEM WITH V-S VARIABLE DISPLACEMENT COMPRESSOR.

Note: Inspection conditions:

1. Operate the engine at approximately 1,500 rpm.
2. Open the door windows.
3. Set the fan switch to the "MAX" position.
4. Turn the AUTO switch "ON".
5. Ensure that compressor discharge pressure is at least 588 kPa (6 kg/cm2, 85 psi).

Note: When discharge pressure does not reach 588 kPa (6 kg/cm25 85 psi) in areas where outside air temperature is low5 proceed as follows:

1. Set the P.T.C. to "full-hot".
2. Set the REC switch to the recirculation position.
3. lose the door windows completely.
4. Increase the compartment temperature so that discharge pressure reaches at least 588 kPa (6 kg/cm2, 85 psi).






Refrigerant charge amount checking
1. Check the refrigerant charge amount using the following table as a guide.

Note: The conditions of the bubbles in the sight glass, temperatures, and pressures are affected by ambient temperature and relative humidity.






TROUBLE DIAGNOSES FOR ABNORMAL PRESSURE
1. Whenever abnormal pressure of high and/or low sides of the system is noted, diagnosis must be conducted by using a manifold gauge. The large-line zone on the gauge scale shown in the following table refers to the standard (normal) pressure range for the corresponding pressure side (high or low). Since the standard (normal) pressure, however, differs from vehicle to vehicle, refer to the Ambient Temperature-Pressure Characteristics" chart.

Note: Pressure measurements are effective only when ambient temperature is in the range indicated under the heading "INSPECTION DATA (2) Measurement of compressor's high and low pressures