Mazda MX-6 1998, Workshop Manual

Page: 918 / 1282

REFRIGERANT SYSTEM
11. If not as specified, troubleshoot the refrigerant
system. (Refer to 07-01 SYMPTOM
TROUBLESHOOTING.)
REFRIGERANT CHARGING
Caution
•
Do not exceed the specification when
charging the system with refrigerant.
Doing so will decrease the efficiency of the
air conditioner or damage the refrigeration
cycle parts.
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.
AIR PURGE,VALVE
W 6 U 7 1 0 W 0 6
TAP PIN SID
CHARGING HOSE
MANIFOLD GAUGE
VACUUM PUMP
HOSE
REFRIGERANT
TANK
SCALE
VACUUM PUMP
W 6 U 7 1 0 W A 4
7. 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 backflow into the
refrigeration cycle and cause a decrease in
the efficiency of the air conditioner.
8. Start the vacuum pump and let it operate for 15
minutes.
MANIFOLD GAUGE
9. Verify that high- and low-pressure side readings of
the manifold gauge are a t -101 kPa {-760
mmHg, -2 9 .9 inHg). Close each valve of the
manifold gauge.
W 6 U 7 1 0 W A 5
10. Stop the vacuum pump and wait for 5 minutes.
11. Check the high- and low-pressure side readings of
the manifold gauge. If the reading has changed,
check for leaks and then repeat from step
7. If the
reading has not changed, go to step 12.
12. Open the valve of the refrigerant tank.
13. Weigh the refrigerant tank to charge the suitable
amount of refrigerant.
Regular amount of refrigerant
750 g (26.5 oz}
Warning
• If the refrigerant system is charged with a
large amount of refrigerant when checking
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
(causing the “greenhouse effect”), follow
the proper procedures and charge with
only a small amount of refrigerant when
checking for gas leakage.
• If charging the system with refrigerant by
service cans or refrigerant tank, running
the engine with the high-pressure side
valve open is dangerous. Pressure within
the service cans or refrigerant tank will
increase and they 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.
14. Open the low-pressure side valve of the manifold
gauge.
0 7 -1 0 -3