System Performance Check

The performance test will help determine if the air conditioner system is operating within specifications.

Only use service equipment that is U.L.-listed and is certified to meet the requirements of SAE J2210 to remove R-134a from the air conditioner system.

CAUTION: Exposure to air conditioner refrigerant and lubricant vapor or mist can irritate eyes, nose and throat. Avoid breathing the air conditioner refrigerant and lubricant vapor or mist.

If accidental system discharge occurs, ventilate work area before resuming service.

R-134a service equipment or vehicle air conditioner systems should not be pressure tested or leak tested with compressed air.

WARNING: Some mixture of air and R~134a have been shown to be combustible at elevated pressures and can result in fire or explosion causing injury or property damage. Never use compressed air to pressure test R-134a service equipment or vehicle air conditioner systems.

Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers.

Recovery/Recycling/Charging System:

1. Connect a R-134a refrigerant Recovery/Recycling Charging System to the car as shown following the equipment manufacturer's instructions.
2. Insert a thermometer in the center vent outlet. Determine the relative humidity and air temperature by calling the local weather information line.
3. Test conditions:
^ Avoid direct sunlight.
^ Open hood.
^ Open front doors.
^ Set the temperature control lever to MAX COOL and push the mode control button to VENT and push the recirculation control button to RECIRC.
^ Slide the fan switch to MAX.
^ Run the engine at 1,500 rpm.
^ No driver or passengers in vehicle.

Measuring Temperature Through A/C Vent:

4. After running the air conditioning for 10 minutes under the above test conditions, read the delivery temperature from the thermometer in the dash vent and the high and low system pressure from the A/C gauges.

Air Conditioning Pressure/Temperature Chart:

5. 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 one line above and one line below the humidity' level (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.