U–10
REFRIGERANT SYSTEM SERVICE PROCEDURES
Evacuation
1. Open all the valves of the SST (49 C061 001).
Caution
• Close the SST (49 C061 001) valve immediately after stopping the vacuum pump. If the valve is left
open, the vacuum pump oil will flow back into the refrigeration cycle and cause a decrease in the
efficiency of the air conditioner.
2. Start the vacuum pump and let it operate for 15
minutes.
3. Verify that high- and low-pressure side readings
of the SST (49 C061 001) are at –101 kPa {–760
mmHg, –29.9 inHg}. Close each valve of the
SST (49 C061 001).
Airtightness Check
1. Stop the vacuum pump and wait for 5 minutes.
2. Check the high- and low-pressure side readings of the SST (49 C061 001).
• If the reading has changed, inspect for leakage and go to Evacuation. (See U–10 Evacuation.)
• If the reading has not changed, go to Charging New R-134a Refrigerant. (See U–10 Charging New R-134a
Refrigerant.)
Charging New R-134a Refrigerant
1. Open the valve of the refrigerant tank.
2. Weigh the refrigerant tank to charge the suitable amount of refrigerant.
Warning
• If the refrigerant system is charged with a large amount of refrigerant when inspecting for gas
leakage, and if any leakage should occur, the refrigerant will be released into the atmosphere. In
order to prevent the accidental release of refrigerant which can destroy the ozone layer in the
stratosphere, follow the proper procedures and charge with only a small amount of refrigerant
when inspecting for gas leakage.
• If charging the system with refrigerant using service cans, running the engine with the high-
pressure side valve open is dangerous. Pressure within the service cans will increase and the
cans could explode, scattering metal fragments and liquid refrigerant that can seriously injure
you. Therefore, do not open the high-pressure side valve while the engine is running.
Caution
• Always being charging of refrigerant from the high-pressure side. If changing is begun from the
low-pressure side, the vanes of the A/C compressor will not be released and abnormal noise may
result.
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