Mazda CX 7. Manual — part 288

REFRIGERANT SYSTEM

07-10–5

07-10

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

gauge 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 low-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.

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

10. Open the low-pressure side valve of the manifold

gauge 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 manifold

gauge and the valve of the refrigerant tank.

12. Stop the engine and A/C compressor.

Leak Test

1. Inspect for leakage using the a 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 the next step.

2. Inspect for leakage again.

• If there is no leakage after tightening the joint, go to the 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 manifold gauge from the charging valves.
4. Install the caps to the charging valves.

End Of Sie

OPEN

MANIFOLD GAUGE

acxuuw00000771

MANIFOLD
GAUGE

acxuuw00000770

OPEN

MANIFOLD GAUGE

acxuuw00000773

CAP

CAP

acxuuw00000774

1871-1U-06B(07-10).fm 5 ページ ２００６年３月１５日 水曜日 午前１１時２９分

REFRIGERANT SYSTEM

07-10–6

REFRIGERANT RECOVERY

id071000800500

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 PRESSURE CHECK

id071000800600

1. Connect the manifold gauge. (See 07-10-2 REFRIGERANT SYSTEM GENERAL PROCEDURES.)
2. Start the engine and after it is warmed up, run it at a constant 1,500 rpm.
3. Set the fan speed MAX HI.
4. Turn the A/C switch on.
5. Set to RECIRCULATE mode.
6. Set the temperature control to MAX COLD.
7. Set to VENT mode.
8. Close all the doors and all the windows.
9. Measure the ambient temperature and high- and low- pressure side reading of the manifold gauge.

10. Verify that the intersection of the pressure reading of the manifold gauge and ambient temperature is in the

shaded zone.

• If there is any malfunction, inspect the

refrigerant system according to the
troubleshooting chart.

End Of Sie

REFRIGERANT SYSTEM PERFORMANCE TEST

id071000800700

1. Inspect the refrigerant pressure. (See 07-10-6 REFRIGERANT PRESSURE CHECK.)
2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
3. Start the engine and after it is warmed up, run it at a constant 1,500 rpm.
4. Set the fan speed to MAX HI.
5. Turn the A/C switch on.
6. Set to RECIRCULATE mode.
7. Set the temperature control to MAX COLD.
8. Set to VENT mode.
9. Close all the doors and windows.

10. Wait until the air conditioner output temperature stabilizes.

Stabilized condition

• The A/C compressor repeatedly turns on and off at regular intervals.

11. After the blower air is stabilized, read the dry-bulb thermometer.

HIGH-PRESSURE SIDE

LOW-PRESSURE SIDE

PRESSURE READING OF MANIHOLD GA

UGE

2.0
{20, 284}

1.0
{10, 142}

0.15
{1.5, 22}

0.10
{1.0, 14}

15

{59}

20

{68}

25

{77}

30

{86}

40

{104}

35

{95}

MPa
{kgf/cm

2

, psi}

AMBIENT TEMPERATURE

°C {°F}

10

{50}

1.5
{15, 213}

2.5
{25, 355}

acxuuw00000775

1871-1U-06B(07-10).fm 6 ページ ２００６年３月１５日 水曜日 午前１１時２９分

REFRIGERANT SYSTEM

07-10–7

07-10

12. Verify the ambient temperature.
13. Verify that the temperature reading is in the shaded zone.

• If the there is any malfunction, inspect the

refrigerant system according to the
troubleshooting chart.

End Of Sie

CENTER VENTILA

T

O

R

TEMPERA

TURE

15

{59}

20

{68}

25

{77}

30

{86}

40

{104}

35

{95}

°C {°F}

°C {°F}

AMBIENT TEMPERATURE

10

{50}

1 {34}

3 {37}

5 {41}

7 {45}

9 {48}

acxuuw00000687

1871-1U-06B(07-10).fm 7 ページ ２００６年３月１５日 水曜日 午前１１時２９分