A/C System Test

Performance Test 

The performance test will help determine if the A/C system is operating within specifications.

1. Do the A/C system inspection (see A/C SYSTEM INSPECTION ), and correct any problems found.
2. Connect an R-134a refrigerant recovery/recycling/charging station to the high-pressure service port and the low-pressure service port, following the equipment manufacturer's instructions.
3. Determine the relative humidity and air temperature.
4. Open the glove box. Remove the glove box stop on right side, then let the glove box hang down (see GLOVE BOX REMOVAL/INSTALLATION ).
5. Insert a thermometer (A) in the center vent.
   Fig 1: Inserting Thermometer In Center Vent

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
6. Place a thermometer (B) near the blower unit's recirculation inlet duct.
7. Test conditions:
   • Move the vehicle out of direct sunlight and let it cool down to the surrounding (ambient) temperature. If necessary, wash the vehicle to cool it down more quickly.
   • The ambient temperature must be at least 60°F (16°C).
   • Open the hood.
   • Open the front doors.
   • Set the temperature control dial to Max Cool, the mode control button to Vent, and the recirculation control button to Recirculate.
   • Turn the A/C button ON and the fan control dial to Max.
   • Hold the engine speed at 1, 500 rpm.
   • No driver or passengers in the vehicle.
8. Inspect the A/C components for the following conditions:
   • A/C compressor clutch not engaged.
   • Abnormal frost areas.
   • Unusual noises.

   If you observe any of these conditions, refer to the SYMPTOM TROUBLESHOOTING INDEX .

9. After running the air conditioning for 10 minutes under the above test conditions, read the delivery temperature from the thermometer in the center vent, the intake temperature near the blower unit, and the discharge (high) and suction (low) pressures on the A/C gauges.
10. To complete the vent (delivery)/ambient air (intake) temperature chart:
    • Mark the vent (delivery) temperature on the vertical line.
    • Mark the ambient air (intake) temperature on the bottom line.
    • Draw a vertical line from the ambient air (intake) temperature mark.
    • Draw a horizontal line from the vent (delivery) temperature mark until it intersects the vertical line.
    NOTE: The vent temperature and ambient air temperature lines should intersect in the shaded area. Any measurements outside the area may indicate the need for further inspection.