Performance Test

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

CAUTION:

Air conditioning refrigerant or lubricant vapor can irritate your eyes, nose, or throat.
Be careful when connecting service equipment.
Do not breathe refrigerant or vapor.

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

NOTE:

If accidental system discharge occurs, ventilate work area before resuming service.
Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

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.
Determine the relative humidity and air temperature.
Remove the glove box housing, (see LOWER GLOVE BOX REMOVAL/INSTALLATION ).
Insert a thermometer (A) in the center vent.

Fig 1: Inserting Thermometer In Center Vent
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Place a thermometer (B) near the blower unit's recirculation inlet duct.
Test conditions:
- Avoid direct sunlight.
- Open hood.
- Open front doors.
- Set the temperature control dial to Max Cool (front and rear), the mode control switch to Vent (front and rear), and the recirculation control switch to Recirculate.
- Turn the A/C switch ON and the fan switch to Max (front and rear).
- Run the engine at 1,500 rpm.
- No driver or passengers in vehicle.
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.
To complete the charts:
- Mark the delivery temperature along the vertical line.
- Mark the intake temperature (ambient air temperature) along the bottom line.
- Draw a line straight up from the air temperature to the humidity.
- Mark a point 10% above and 10% below the humidity level.
- From each point, draw a horizontal line across the delivery temperature.
- The delivery temperature should fall between the two lines.
- Complete the low-side pressure test and high-side pressure test in the same way.
- Any measurements outside the line may indicate the need for further inspection.

Example

Intake temperature (dry): 86°F (30°C) Humidity level 70%
Intake temperature (wet): 77.9°F (25.5°C)
Intake pressure: 294 kPa (3.0 kgf/cm² ) (42.6 psi)
Delivery temperature: 67.8°F (19.9°C)
Delivery pressure: 2,099 kPa (21.4 kgf/cm² ) (304.4 psi)

Results: Within normal range

Fig 2: Example Of Temperature And Pressure Graph

Courtesy of AMERICAN HONDA MOTOR CO., INC.