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1B-12 AIR CONDITIONING (OPTIONAL)
Performance diagnosis table
NOTE:
If ambient temperature is approximately 30 °C (86 °F), it is possible to diagnose A/C system in detail
referring to "DETAILED DIAGNOSIS TABLE (AMBIENT TEMPERATURE AT 30°C (86°F))" under "A/C
System Performance Inspection" in this section.
9) Check for each pressure of low side and high side if it is
within shaded range of left graph.
If each gauge reading is out of specified pressure, correct
defective part referring to following Test Diagnosis table.
NOTE:
Pressure registered on gauge varies with ambient tem-
perature. Therefore, use left graphs when determining if
pressures are normal or not.
Example:
Gauges should read as follows when ambient tempera-
°
°F
ture is 30
C (86
)
Pressure on high pres-
sure gauge (HI):
Pressure on low pressure
gauge (LO):
10) Check inlet port temperature-to-outlet port temperature rela-
tionship using graph at the left.
For example, if evaporator inlet port temperature is 25 ° C (77
° F) and center duct air outlet temperature is 8 ° C (46.4 ° F),
their crossing point is within acceptable range as shown in
graph at the left.
In this case, cooling performance is satisfactory and proper.
11) If crossing point is out of acceptable range, diagnose trouble
referring to following Test Diagnosis table.
1400 – 1750 kPa
14.0 – 17.5 kg/cm
2
230 – 350 kPa
2.3 – 3.5 kg/cm
2
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