Mazda CX 7. Manual — part 287

REFRIGERANT SYSTEM

07-10–1

07-10

07-10

REFRIGERANT SYSTEM

REFRIGERANT SYSTEM SERVICE

WARNINGS . . . . . . . . . . . . . . . . . . . . . 07-10–1

Using/Handling Unapproved

Refrigerant . . . . . . . . . . . . . . . . . . . . . 07-10–1

Handling Refrigerant . . . . . . . . . . . . . . 07-10–1
Storing Refrigerant. . . . . . . . . . . . . . . . 07-10–1

REFRIGERANT SYSTEM SERVICE

CAUTIONS . . . . . . . . . . . . . . . . . . . . . . 07-10–1

Handling Insufficient

Refrigerant Level . . . . . . . . . . . . . . . . 07-10–1

Handling Compressor Oil . . . . . . . . . . . 07-10–2

REFRIGERANT SYSTEM GENERAL

PROCEDURES . . . . . . . . . . . . . . . . . . . 07-10–2

Manifold Gauge Set Installation . . . . . . 07-10–2

REFRIGERANT CHARGING . . . . . . . . . . 07-10–2

Charging Recycled R-134a

Refrigerant . . . . . . . . . . . . . . . . . . . . . 07-10–2

Charging Preparation . . . . . . . . . . . . . . 07-10–3
Evacuation. . . . . . . . . . . . . . . . . . . . . . . 07-10–3
Airtightness Check . . . . . . . . . . . . . . . . 07-10–3
Charging New R-134a Refrigerant . . . . 07-10–4
Leak Test . . . . . . . . . . . . . . . . . . . . . . . . 07-10–5

REFRIGERANT RECOVERY . . . . . . . . . . 07-10–6
REFRIGERANT PRESSURE CHECK . . . 07-10–6
REFRIGERANT SYSTEM

PERFORMANCE TEST . . . . . . . . . . . . . 07-10–6

End of Toc

WM: REFRIGERANT SYSTEM

REFRIGERANT SYSTEM SERVICE WARNINGS

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Using/Handling Unapproved Refrigerant

• Using a flammable refrigerant, such as OZ-12, in this vehicle is dangerous. In an accident, the

refrigerant may catch fire, resulting in serious injury or death. When servicing this vehicle, use only R-
134a.

• Checking for system leakage on a vehicle that has been serviced with flammable refrigerant, such as

OZ-12, is dangerous. Conventional leak detectors use an electronically generated arc which can ignite
the refrigerant, causing serious injury or death. If a flammable refrigerant may have been used to
service the system, or if you suspect a flammable refrigerant has been used, contact the local fire
marshal or EPA office for information on handling the refrigerant.

Handling Refrigerant

• 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.

• Do not pressure test or leak test R-134a service equipment and/or vehicle air conditioning system with

compressed air. Some mixtures of air and R-134a have been shown to be combustible at elevated
pressures. These mixtures, if ignited, may cause injury or property damage. Additional health and
safety information may be obtained from refrigerant manufacturers.

• Do not allow the refrigerant to leak near fire or any kind of heat. A poisonous gas may be generated if

the refrigerant gas contacts fire or heat such as from cigarettes and heaters. When carrying out any
operation that can cause refrigerant leakage, extinguish or remove the above-mentioned heat sources
and maintain adequate ventilation.

• Handling liquid refrigerant is dangerous. A drop of it on the skin can result in localized frostbite. When

handling the refrigerant, wear gloves and safety goggles. If refrigerant splashes into the eyes,
immediately wash them with clean water and consult a doctor.

Storing Refrigerant

• The refrigerant container is highly pressurized. If it is subjected to high heat, it could explode,

scattering metal fragments and liquid refrigerant that can seriously injure you. Store the refrigerant at
temperatures below 40

°C {104°F}.

End Of Sie

REFRIGERANT SYSTEM SERVICE CAUTIONS

id071000800200

Handling Insufficient Refrigerant Level

• If an insufficient refrigerant level is detected at troubleshooting, do not charge (add) the refrigerant.

Because an accurate amount of refrigerant cannot be determined from the pressure indicated on the
manifold gauge, never charge the refrigerant. If there is too much or too little refrigerant from the
refilling, there may be secondary problems such as damage to the refrigerant cycle parts, or a decrease
of cooling performance. Therefore, if it is determined that the refrigerant level is insufficient,
completely remove refrigerant from the refrigerant cycle and refill with refrigerant to the specified
amount.

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REFRIGERANT SYSTEM

07-10–2

Handling Compressor Oil

• Use only ATMOS GU10 compressor oil for this vehicle. Using a PAG oil other than ATMOS GU10

compressor oil can damage the A/C compressor.

• Do not spill ATMOS GU10 compressor oil on the vehicle. A drop of compressor oil on the vehicle

surface can eat away at the paint. If oil gets on the vehicle, wipe it off immediately.

• 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.

• If the refrigerant gas is completely discharged

from the system for reasons such as a
malfunction during A/C operation, repair or
replace the malfunctioning part, charge the
refrigerant to the specified amount and always
add 60 ml {60 cc, 2.03 fl oz} of A/C
compressor. If the compressor oil is not adequately replenished, the A/C compressor may quickly
deteriorate, abnormal noise may develop, cooling performance may be affected or, in the worst case,
the A/C compressor may seize.

End Of Sie

REFRIGERANT SYSTEM GENERAL PROCEDURES

id071000800300

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. Connect the quick couplers to the charging

valves.

End Of Sie

WM: REFRIGERANT

REFRIGERANT CHARGING

id071000800400

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.

MOISTURE ABSORPTION

0

MINERAL OIL

ATMOS GU10 COMPRESSOR OIL (PAG OIL)

TIME

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MANIFOLD GAUGE

CHARGING HOSE

QUICK COUPLER

CAP

CAP

CHARGING VALVE OF
LOW-PRESSURE SIDE

CHARGING
VALVE OF
HIGH-PRESSURE
SIDE

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REFRIGERANT SYSTEM

07-10–3

07-10

Charging Preparation

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.

Regular amount of refrigerant (approx. quantity)

500 g {17.7 oz}

Evacuation

1. 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 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

min.

3. 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.

Airtightness Check

1. Stop the vacuum pump and wait for 5 min.
2. Check the high- and low-pressure side readings of the manifold gauge.

• If the reading has changed, inspect for leakage and go to Evacuation. (See 07-10-3 Evacuation.)

• If the reading has not changed, go to Charging New R-134a Refrigerant. (See 07-10-4 Charging New R-

134a Refrigerant.)

SCALE

REFRIGERANT
TANK

CHARGE HOSE

TAP PIN SIDE

AIR PURGE VALVE

MANIFOLD GAUGE

VACUUM PUMP
HOSE

VACUUM PUMP

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CLOSE

MANIFOLD
GAUGE

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MANIFOLD
GAUGE

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REFRIGERANT SYSTEM

07-10–4

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.

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

gauge.

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 manifold gauge.

5. Inspect for leakage from the cooler pipe/hose

connections using a 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 the next step.

6. 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
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.

OPEN

MANIFOLD GAUGE

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MANIFOLD
GAUGE

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