Mazda CX-7 2007 Workshop Manual page 1148

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.
3. Open the high-pressure side valve of the manifold
gauge.
4. When the low-pressure side reading increases to
0.098 MPa {1.0 kgf/cm
pressure side valve of the manifold gauge.
5. Inspect for leakage from the cooler pipe/hose
connections using a gas leak tester.
• If there is no leakage, go to Step 7.
• If leakage is found at a loose joint, tighten the
joint, then go to the next step.
6. Inspect for leakage again.
• If there is no leakage after tightening the joint,
go to the next step.
• If there is still a leakage at the same joint,
discharge the refrigerant and then repair the
joint. Repeat the charging procedure from
evacuation.
Warning
• 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.
07-10–4
REFRIGERANT SYSTEM
2
, 14 psi}, close the high-
OPEN
MANIFOLD
GAUGE
MANIFOLD GAUGE
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