Isuzu 1999 RODEO Workshop Manual page 64

1A–36 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Checking The Refrigerant System With
Manifold Gauge
Since Refrigerant-134a (HFC-134a) is used in the air
conditioning system in this vehicle, be sure to use
manifold gauges, charging hoses and other air
conditioning service tools for HFC-134a when
checking the refrigerant system.
Conditions:
f Run the engine at Idling
f Air conditioning switch is "ON"
f Run the blower motor at "HIGH" position
f Temperature control lever set to "MAX COLD"
f Air source selector lever at "CIRC"
f Open the engine hood
f Close all the doors
Normal Pressure:
f At
ambient temperature:
(77–86°F).
f At low-pressure side: approx. 147.1–294.2 kPa
(21.3–42.7 psi).
f At high-pressure side: approx. 1372.9–1863.3 kPa
(199.1–270.2 psi).
Refer to the table on the refrigerant pressure-temperature
relationship.
approx. 25–30°C
Connect The Manifold Gauge
Low-pressure hose (LOW) — Suction side
High pressure hose (HI) — Discharge side
HFC-134a Pressure-Temperature Relationship
Pressure
(kPa) (psi)
36 5.3
67 9.7
104 15
147 21
196 28
255 37
314 45
392 57
471 68
569 82
677 98
785 114
912 132
1059 154
1216 176
Temperature
(°C) (°F)
–20 –4.4
–15 5
–10 14
–5 23
0 32
5 41
10 50
15 59
20 68
25 77
30 86
35 95
40 104
45 113
50 122
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