Chery S11 / Chery QQ. Manual — part 78

Chery QQ Service Manual

found and repaired, then air in

systemis evacuated.

4. Refrigerant circulation is out of condition

Symptom：insufficient cold air

Fault symptom of

refrigeration system

Possible reasons

Fault diagonosis

Troubleshooting

action

Low pressure at both low

pressure side and high side

There is frost between the

reservoir and the assemby

pipe.

Refrigerant can not

flow due to the

reservoir is blocked by

dirt.

Reservoir is

blocked.

replace the

reservoir.

5. Refrigerant doesn’t circulate

Symptom：without cold air (sometimes there has cold air)

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Chery QQ Service Manual

Fault symptom of

refrigeration

system

Possible reasons

Fault diagonosis

Troubleshooting action

Low pressure side

indicates vacuum and

high pressure side

indicates too low

pressure.

Frost or dew appears

on the pipes before

and behind the

reservoir, drier and

expansion valve.

Refrigerant can not

flow because the water

vapor or dirt block the

refrigeration system

Refrigerant can not

flow because the

thermal sensitive pipe

of the expansion valve

leaks air or is blocked.

Refrigerant

doesn’t circulate

（

1 ） check the thermal

sensitive pipe, expansion

valve and pressure

regulator of the evaporator.

（

2）blow out the dirt in

the expansion valve with

air

（

3）if the dirt can not be

removed, expansion valve

should be replaced.

（

4 ） evacuate air from

system and charge

appropriate amount of new

refrigerant.

If thermal sensitive pipe

leaks air, the expansion

valve should be replaced.

6. Excessive charge of refrigerant or insufficient refrigerating of condensator

symptom：insufficient cold air

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Chery QQ Service Manual

Fault symptom

of refrigeration

system

Possible reasons

Fault diagonosis Troubleshooting

action

High pressure at both

the low and high

pressure sides even

if the engine runs at

a very low rotation

speed.

Good performance

cannot be played

due to excessive

refrigerant in the

system

Insufficient

refrigerating of

condensator

Excessive refrigerant in

circulation

Excessive charge of

refrigerant

Insufficient refrigerating

of condensator

Radiator rib of

condensator is blocked or

the motor of fan has fault.

（

1）clean the condensator

（

2 ） check the working

conditions of fan’s motor

（

3）if （1）and（2）is normal，

check the amount of

refrigerant and charge

appropriate amount of

refrigerant.

7. Air exists in refrigeration system

Symptom：inadequate

temperature reduction

Note：

when

refrigeration system is open to charge refrigerant without evacuating, the meter will

show reading.

Fault symptom

of refrigeration

system

Possible reasons

Fault diagonosis Troubleshooting

action

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Chery QQ Service Manual

High pressure at both

the low and high

pressure sides

Low pressure pipe is

too hot to be

touched

Air enters

refrigeration

system

Air exists in the

refrigeration system

↓

Inadequate vacuum

（

1）check if the compressor

oil is polluted or

insufficient.

（

2 ） evacuate air in the

system and charge new

refrigerant.

8. Improper installation of expansion valve /breakdown of the thermal sensitive

pipe（open too much）

。

Symptom：inadequate cold air

Fault symptom of

refrigeration system

Possible reasons

Fault diagonosis

Troubleshooting action

High pressure at both

the low and high

pressure side

Frost or a large amout

of dew at the low

pressure pipe side.

Expansion valve

has fault or

improper

installation of the

thermal sensitive

pipe

Excessive

refrigerant in the

low pressure pipe

↓

Expansion valve

opens too much

（

1）check the installation

status of thermal sensitive

pipe

（

2）if (1)is normal，check

the expansion valve. If it is

broken, replace it.

9. Compression of the compressor is out of condition

Symptom：without cold air

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