Troubleshooting With Manifold Pressure Gauges

Fig. 2 Air Conditioning System Diagnostic Chart:

To diagnose system, connect manifold gauge set to high and low sides of system, then observe gauge readings with engine operating at fast idle. Refer to chart, Fig. 2 for system diagnosis.
High side reading should be 206-213 psi., while low side reading should be 21-28 psi. at ambient temperature of 86-95 degrees F.