Refrigerant Pressure Check

1. Install the manifold gauge set.
2. Open all the doors and all the windows.
3. Warm up the engine and run it at a constant 1,500 rpm.
4. Turn the A/C switch on.
5. Set the fan switch at the 4th position.
6. Set the REC/FRESH lever to REC. (wire type)
7. Turn the REC switch on. (logic type)
8. Set the mode lever to VENT. (wire type)
9. Turn the VENT switch on. (logic type)
10. Set the temperature control lever to MAX COLD.
11. Measure the ambient temperature and the high- and low-pressure side readings of the manifold gauge.
12. If the high and low-pressure side readings are in the shaded zones shown in the figure, the refrigerant system is normal.
13. If the high and low-pressure side readings are not within the shaded zone, troubleshoot the refrigerant system.