Initial Inspection and Diagnostic Overview
Refrigerant System InspectionPossible refrigerant system problems can be located by checking the refrigerant amount and refrigerant pressure.
Checking Refrigerant Amount
1. Install the manifold gauge set.
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.
- 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 REC.
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.
If the pressure is 210 kPa (2.1 kgf/cm2, 30 psi) or higher, inspect the thermoswitch.
Checking Refrigerant Pressure
1. Close the front windows.
2. Install the manifold gauge set.
3. Start the engine and run it at 1,500 rpm.
4. Turn the A/C switch on and set the fan switch to the forth position.
5. Press the REC switch and VENT switch on.
6. Set the temperature control lever to MAX COLD.
7. Verify that the pressure readings of the manifold gauge are in the shaded zones.
8. If the pressures are not as specified, refer to the following table and repair the system.
9. If the pressures are normal, inspect the control system.
