A/C System Performance

Park vehicle out of direct sunlight. Open engine hood. Open front doors. Connect A/C pressure gauges to pressure ports. Determine relative humidity and ambient air temperature.
Move temperature control lever to coldest setting. Select vent mode. Select recirculated air. Insert a thermometer in center vent outlet. Set blower switch to highest speed. Run engine at 1500 RPM. Ensure no one is inside vehicle.
After running A/C for 10 minutes, check temperature at center vent outlet. Check system pressures. If temperature and pressures match the A/C system performance test chart, system is operating within range. See Fig 1 or Fig 2 .

Fig 1: A/C System Performance Test Chart (°F & psi)

Courtesy of AMERICAN HONDA MOTOR CO., INC.

Fig 2: A/C System Performance Test Chart (°C & kg/cm² )

Courtesy of AMERICAN HONDA MOTOR CO., INC.