Mazda Protege 5. Manual — part 274

REFRIGERANT SYSTEM

07–10–2

•

ATMOS GU10 compressor oil (PAG oil) has a
higher moisture absorption efficiency than the
previously used mineral oil. If moisture mixes
with the compressor oil, the refrigerant
system could be damaged. Therefore, install
caps immediately after using the compressor
oil or removing refrigerant system parts to
prevent moisture absorption.

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REFRIGERANT SYSTEM GENERAL PROCEDURES

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Manifold Gauge Set Installation

1. Fully close the valves of the manifold gauge.
2. Connect the charging hoses to the high- and low-

pressure side joints of the manifold gauge.

3. Connect the quick couplers to the ends of the

charging hoses.

4. Remove the caps from the charging valves.
5. Connect the quick couplers to the charging

valves.

End Of Sie

REFRIGERANT SYSTEM PERFORMANCE TEST

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1. Perform refrigerant pressure check. (See 07–10–3 REFRIGERANT PRESSURE CHECK.)

•

If they are correct, go to the next step.

•

If not as specified, troubleshoot refrigerant system. (See 07–03–1 TROUBLESHOOTING INDEX.)

2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
3. Close the hood.
4. Warm up the engine and run it at a constant 1,500 rpm.
5. Set the fan switch to 4th position.
6. Turn the A/C switch on.
7. Set the RECIRCULATE mode.
8. Set the temperature control to MAX COLD.
9. Set the VENT mode.

10. Close all the doors and all the windows.
11. Wait until the air conditioner output temperature stabilizes. The output temperature is stable when the A/C

compressor is repeatedly turned on and off based on the A/C compressor control of A/C amplifier.

12. Record driver-side center ventilator temperature.
13. Determine and record ambient temperature.
14. Verify that the temperature reading is in the shaded zone.

•

If the performance is not within the shaded
zone, troubleshoot the refrigerant system.
(See 07–03–1 TROUBLESHOOTING
INDEX.)

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REFRIGERANT SYSTEM

07–10–3

07–10

REFRIGERANT PRESSURE CHECK

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1. Install the manifold gauge set.
2. Close the hood.
3. Warm up the engine and run it at a constant 1,500 rpm.
4. Set the fan switch to 4th position.
5. Turn the A/C switch on.
6. Set the RECIRCULATE mode.
7. Set the temperature control to MAX COLD.
8. Set the VENT mode.
9. Close all the doors and all the windows.

10. Measure the ambient temperature and the high-

and low-pressure side readings of the manifold
gauge.

•

If the high- and low-pressure side readings
are in the shaded zone as shown in the figure,
the refrigerant system is normal.

•

If the pressure is abnormal, see No.6 of
symptom troubleshooting. (See 07–03–6
NO.6 AIR FROM VENTS NOT COLD
ENOUGH.)

End Of Sie

REFRIGERANT RECOVERY

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Warning

••••

Avoid breathing air conditioning refrigerant or lubricant vapor. Exposure may irritate eyes, nose
and throat. Also, due to environmental concerns, use service equipment certified to meet the
requirements of SAE J2210 (R-134a recycling equipment) when draining R-134a from the air
conditioning system. If accidental system discharge occurs, ventilate work area before resuming
service.

1. Connect an R-134a recovery/recycling/recharging device to the vehicle and follow the device manufacturer’s

instructions.

End Of Sie

REFRIGERANT CHARGING

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Warning

••••

Avoid breathing air conditioning refrigerant or lubricant vapor. Exposure may irritate eyes, nose
and throat. Also, due to environmental concerns, use service equipment certified to meet the
requirements of SAE J2210 (R-134a recycling equipment) when draining R-134a from the air
conditioning system. If accidental system discharge occurs, ventilate work area before resuming
service.

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.

Charging Recycled R-134a Refrigerant

1. Connect an R-134a recovery/recycling/recharging device to the vehicle and follow the device manufacturer’s

instructions.

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REFRIGERANT SYSTEM

07–10–4

Charging New R-134a Refrigerant

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.
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 back flow 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.

9. 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.

10. Stop the vacuum pump and wait for 5 minutes.
11. Inspect the high- and low-pressure side readings

of the manifold gauge.

•

If the reading has changed, inspect for
leakage and then repeat from Step 7.

•

If the reading has not changed, and go to next
step.

12. Open the valve of the refrigerant tank.
13. Weigh the refrigerant tank.

Regular amount of refrigerant (approximate quantity)

600 g {21.2 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, 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.

Caution

••••

Always begin charging of refrigerant from the high-pressure side. If charging is begun from the
low-pressure side, the vanes of the A/C compressor will not be released and abnormal noise may
result.

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REFRIGERANT SYSTEM

07–10–5

07–10

14. Open the high-pressure side valve of the manifold

gauge.

15. When the low-pressure side reading increases to

0.098 MPa {1.0 kgf/cm

2

, 14 psi}, close the high-

pressure side valve of the manifold gauge.

16. Inspect for leakage from the cooler pipe/hose

connections using a gas leak tester.

•

If there is no leakage, go to Step 18.

•

If leakage is found at a loose joint, tighten the
joint, then go to the next step.

17. 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
Step 7.

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.

18. Open the high-pressure side valve of the manifold

gauge and charge with refrigerant until the weight
of refrigerant tank has decreased 300 g {10.6 oz}
from the amount in Step 13.

19. Close the high-pressure side valve of the

manifold gauge.

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.

20. Start the engine and actuate the A/C compressor.

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