A/C System Test

A/C System Test

Performance Test

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 the work area before resuming service.
- Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

1. 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.
2. Determine the relative humidity and air temperature.
3. Open the glove box. Remove the glove box stop on each side, then let the glove box hang down.
4. Insert a thermometer (A) in the center vent.






5. Place a thermometer (B) near the blower unit's recirculation inlet duct.
6. Test conditions:
- Avoid direct sunlight.
- Open hood.
- Open front doors.
- Set the temperature control dial to Max Cool, the mode control switch to Vent, and the recirculation control switch to Recirculate.
- Turn the A/C switch ON and the fan switch to Max.
- Hold the engine speed at 1,500 rpm.
- No driver or passengers in vehicle.

7. 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.
8. 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 unit it intersects the vertical line.

NOTE: The low side and intake temperatures should intersect in the shaded area within about 10 % of the measured humidity level. Any measurements outside the line may indicate the need for further inspection.






9. To complete the high side (discharge pressure)/ambient air (intake) temperature chart:
- Mark the high side (discharge pressure) temperature on the vertical line.
- Mark the ambient air (intake) temperature on the bottom line.
- Draw a vertical line from the high side (discharge pressure) temperature mark.
- Draw a horizontal line from the vent (delivery)temperature mark unit it intersects the vertical line.

NOTE: The low side and intake temperatures should intersect in the shaded area within about 10% of the measured humidity level. Any measurements outside the line may indicate the need for further inspection.






10. To complete the low side (suction pressure)/ambient air (intake) temperature chart:
- Mark the low side (suction pressure) temperature along the vertical line.
- Mark the ambient air (intake) temperature along the bottom line.
- Draw a vertical line from the ambient air (intake) temperature mark.
- Draw a horizontal line from the vent (delivery) temperature mark unit it intersects the vertical line.

NOTE: The low side and intake temperatures should intersect in the shaded area within about 10 % of the measured humidity level. Any measurements outside the line may indicate the need for further inspection.






Pressure Test