Workshop Manual

HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
1A–25
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:
B Run the engine at idle
B Air conditioning switch is “ON”
B Run the blower motor at “HIGH” position (5 positions)
B Temperature control set to “MAX COLD” (65°F)
B Air source selector at “CIRC”
B Open the engine hood
B Close all the doors
Normal Pressure:
B At ambient temperature: approx. 25–30°C
(77–86°F).
B At low-pressure side: approx. 147.1–294.2 kPa
(21.3–42.7 psi).
B 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.
HFC-134a Pressure-Temperature Relationship
Pressure Temperature
(kPa) (psi) (°C) (°F)
36 5.3 –20 –4.4
67 9.7 –15 5
104 15 –10 14
147 21 –5 23
196 28 0 32
255 37 5 41
314 45 10 50
392 57 15 59
471 68 20 68
569 82 25 77
677 98 30 86
785 114 35 95
912 132 40 104
1059 154 45 113
1216 176 50 122