Mazda 1996 626 Service Manual page 259

HEATER AND REFRIGERANT SYSTEM
REFRIGERANT SYSTEM SERVICE PROCEDURE
Manifold Gauge Set Installation
1. Fully close the valves of the manifold gauge.
2. Connect charging hoses to the high- and low-pressure
side joints of the manifold gauge.
3. Connect quick couplers to the ends of the charging
hoses.
4. Remove the caps from the charging valves of the high-
and low-pressure side cooler pipes.
5. Connect the quick couplers to the charging valves of
the cooler pipes.
Charging
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 can puncture valves to the 4-way joint.
6. Fully open the can puncture valves and connect the
service cans to the valves.
Regular amount of refrigerant: 700 g {24.7 02 }
7. Fully close any can puncture valve that is not connect­
ed to a service can.
8. Connect the 4-way joint to the charging hose that is
connected to the gauge set air purge valve.
9. Open all the valves of the manifold gauge.
10. Start the vacuum pump and let it operate for 15 min­
utes.
11. After 15 minutes, verify that the high- and low-pressure-
side readings of the manifold gauge are at -lO lk P a
{-760 mmHg, -29.9 inHg}. Close each valve of the
gauge set.
12. Stop the vacuum pump and wait for about 5 minutes.
13. After 5 minutes, check the low-pressure-side reading of
the manifold gauge.
If the reading has changed, check for leaks and then
repeat from Step 9.
If the reading has not changed, go to Step 14.
14. Open the service cans by using the can puncture valves.
15.Open the high-pressure side valve of the manifold
gauge and charge with refrigerant until the low-pres­
sure-side reading is at 100 kPa {1 kgf/cm2 , 10 psi}.
16. Close the high-pressure side valve of the manifold
gauge.
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G -4 5