AIR CONDITIONER — Checking Refrigerant Charge / Checking Refrigerant Pressure

G-53prose procedure

REC/FRESH and mode controls differ between wire type and logic type A/C control panels.

1
Install the manifold gauge set. (Refer to page G-50.)
2
Check the refrigerant pressure reading with the engine stopped.
3
Verify that the high- and low-pressure-side readings of the manifold gauge are at 493-788 kPa {5.02-8.04 kgf/cm2, 72-114 psi}. If the pressure readings are lower than specified, recharge the refrigerant amount. (Refer to page G-50.) If the pressure readings are within specification but there is insufficient cooling, go to the next step. If the pressure readings are within specification and there are no leaks, the refrigerant amount is OK.
4
Start the engine and run it at a constant 2,000 rpm.
5
Turn the A/C switch on, set the fan switch at MAX-HI, and set the air intake mode at recirculate.
6
If the A/C compressor is short-cycling, note the low-pressure-side reading at which the magnetic clutch kicks out.
7
If the pressure is 170 kPa {1.7 kgf/cm2, 24 psi} or lower, evacuate and recharge the refrigerant system with the proper amount of refrigerant. (Refer to page G-50.) If the pressure is 210 kPa {2.1 kgf/cm2, 30 psi} or higher, inspect the thermoswitch. (Refer to page G-69.)

1
Install the manifold gauge set. (Refer to page G-50.)
2
Shut all doors and windows.
3
Warm up the engine and run it at constant 1,500 rpm.
4
Set the fan switch at the fourth position.
5
Turn the A/C switch on.
6
Set the REC/FRESH lever (wire type) or REC/FRESH switch (logical type) at recirculate.
7
Set the mode lever (wire type) or mode switch (logic type) at VENT.
8
Set the temperature control lever at MAX COLD.
9
Measure the ambient temperature and the high- and low-pressure side readings of manifold gauge.
10
If the high- and low-pressure-side readings are in the shaded zones shown in the figure, the refrigerant system is normal.

Specification	Value
High- and low-pressure-side reading (engine stopped)engine stopped	493-788kPa {5.02-8.04 kgf/cm2, 72-114 psi}

High- and low-pressure-side reading (engine stopped)engine stopped

493-788kPa {5.02-8.04 kgf/cm2, 72-114 psi}

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