Mazda CX-9 Grand Touring 2009 Manual page 1735

Fig. 5: Inspecting High And Low-Pressure Side Readings Of Manifold Gauge
Courtesy of MAZDA MOTORS CORP.
AIRTIGHTNESS CHECK
1. Stop the vacuum pump and wait for 5 min.
2. Check the high-and low-pressure side readings of the manifold gauge.
If the reading has changed, inspect for leakage and go to Evacuation. (See EVACUATION.)
If the reading has not changed, go to Charging New R-134a Refrigerant. (See 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:
CAUTION:
2008 Mazda CX-9 Grand Touring
2008 HVAC Refrigerant System - Mazda CX-9
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.
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