Mazda CX-7 2007 Workshop Manual page 1147

Charging Preparation
1. Install the manifold gauge set.
2. Connect the tap pin side of the charging hose to the air purge valve of the manifold gauge.
3. Connect the vacuum pump hose to the center joint of the manifold gauge.
4. Connect the vacuum pump hose to the vacuum pump.
5. Connect the charging hose to the refrigerant tank.
6. Place the refrigerant tank on the scale.
Regular amount of refrigerant (approx. quantity)
500 g {17.7 oz}
Evacuation
1. Open all the valves of the manifold gauge.
Caution
• Close the manifold gauge 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
min.
3. Verify that high- and low-pressure side readings
of the manifold gauge are at –101 kPa {–760
mmHg, –29.9 inHg}. Close each valve of the
manifold gauge.
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 07-10-3 Evacuation.)
• If the reading has not changed, go to Charging New R-134a Refrigerant. (See 07-10-4 Charging New R-
134a Refrigerant.)
REFRIGERANT SYSTEM
TAP PIN SIDE
CHARGE HOSE
REFRIGERANT
TANK
SCALE
CLOSE
MANIFOLD
GAUGE
AIR PURGE VALVE
MANIFOLD GAUGE
VACUUM PUMP
HOSE
VACUUM PUMP
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MANIFOLD
GAUGE
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07-10–3
07-10