Mazda 6. Manual — part 375

REFRIGERANT SYSTEM SERVICE PROCEDURES

U–9

U

GAS CHARGING SET INSTALLATION

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1. Fully close the valves of the SST (49 C061 001).
2. Connect the SSTs (49 C061 002, 49 C061 003) to the high- and low-pressure side joints of the SST (49 C061

001).

3. Connect the SSTs (49 C061 006A, 49 C061 007) to the ends of the SSTs (49 C061 002, 49 C061 003).
4. Connect the SSTs (49 C061 006A, 49 C061 007)

to the charging valves.

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RECOVERY

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

instructions.

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CHARGING

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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.

Charging Preparation

1. Install the SSTs (gas charging set).
2. Connect the tap pin side of the SST (49 C061 004) to the air purge valve of the SST (49C061 001).
3. Connect the SST (49 C061 005) to the center joint of the SST (49 C061 001).
4. Connect the SST (49 C061 005) to the vacuum pump.
5. Connect the SST (49 C061 004) to the refrigerant tank.
6. Place the refrigerant tank on the scale.

Regular amount of refrigerant (approximate quantity)

470 g {16.6 oz}: L.H.D.
430 g {15.2 oz}: R.H.D.

REFRIGERANT SYSTEM SERVICE PROCEDURES

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REFRIGERANT SYSTEM SERVICE PROCEDURES

Evacuation

1. Open all the valves of the SST (49 C061 001).

Caution

• Close the SST (49 C061 001) 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

minutes.

3. Verify that high- and low-pressure side readings

of the SST (49 C061 001) are at –101 kPa {–760
mmHg, –29.9 inHg}. Close each valve of the
SST (49 C061 001).

Airtightness Check

1. Stop the vacuum pump and wait for 5 minutes.
2. Check the high- and low-pressure side readings of the SST (49 C061 001).

• If the reading has changed, inspect for leakage and go to Evacuation. (See

U–10 Evacuation

.)

• If the reading has not changed, go to Charging New R-134a Refrigerant. (See

U–10 Charging New R-134a

Refrigerant

.)

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.

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REFRIGERANT SYSTEM SERVICE PROCEDURES

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3. Open the high-pressure side valve of the SST (49

C061 001).

4. 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 SST (49 C061
001).

5. Inspect for leakage from the cooler pipe/hose

connections using the SST (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 next step.

6. Inspect for leakage again.

• If there is no leakage after tightening the joint,

go to 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.

7. Open the high-pressure side valve of the SST (49

C061 001) and charge with refrigerant until the
weight of refrigerant tank has decreased 250 g
{8.83 oz} from the amount in Step 2.

8. Close the high-pressure side valve of the SST (49

C061 001).

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.

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

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REFRIGERANT SYSTEM SERVICE PROCEDURES

10. Open the low-pressure side valve of the SST (49

C061 001) and charge with refrigerant until the
weight of the refrigerant tank has decreased
regular amount from the amount in Step 2.

11. Close the low-pressure side valve of the SST (49

C061 001) and the valve of the refrigerant tank.

12. Stop the engine and A/C compressor.

Leak Test

1. Inspect for leakage using the SST (gas leak tester).

• If there is no leakage, go to Step 3.

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

2. Inspect for leakage again.

• If there is no leakage after tightening the joint, go to next step.

• If there is still leakage at the same joint, discharge the refrigerant and then repair the joint. Repeat the

charging procedure from evacuation.

3. Disconnect the SSTs (49 C061 006A, 49 C061 007) from the charging valves.
4. Install the caps to the charging valves.

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REFRIGERANT PRESSURE CHECK

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1. Install the SSTs (gas charging set).
2. Warm up the engine and run it at a constant 1,500 rpm.
3. Set the fan speed to MAX HI.
4. Turn the A/C switch on.
5. Set the RECIRCULATE mode.
6. Set the temperature control to MAX COLD.
7. Set the VENT mode.
8. Close all the doors and all the windows.
9. Measure the ambient temperature and the high- and low-pressure side reading of the SST (49 C061 001).

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