Chery A18. Manual — part 72

4.1.6. Prize up all connecting buckles of the shell body on

the evaporating tank with the slotted screwdriver, then take

out all bolts on it and take out the air outlet device of the

blower.

Shown as the figure:

Moment: 3±0.5 Nm

4.1.7. Unscrew 2 bolts of the vacuum electromagnetic valve

with the slotted screwdriver and take them out

4.1.8. Unscrew 4 bolts on the blower with the Phillips

screwdriver, and then take them out

4.1.9. Unscrew fixing bolts of the fan blades with the socket

wrench 10# and take them out

Moment：5±0.5 Nm

4.1.10. Unscrew fixing bolts of the fan motor with the Phillips

screwdriver and then take them out

4.1.11. Separate the upper & down parts of the shell body

4.1.12. Just take out the evaporator & expansion valve form

the down shell body

4.2.

Assembly steps

4.2.1.

Assemble according to the inverted sequence of

the disassembly

4.2.2. System evacuation, pressure keeping & antifreezing

fluid filling need to be checked whether or not missing after

assembling. Check the heat exchanger fin whether blocking or

not. And if the heat exchanger is blocked use the compressed

air to clear.

III. Standard sides pressure value of high pressure & low pressure of

the air conditioner system

Side pressure value of the high pressure: 19--20bar

Side pressure value of the low pressure: 2.5--3bar

IV. Frequent Troubleshooting

Pressure deviation type

Possible reason

Troubleshooting

1.

High side pressure is stable or

just

is

a

little

increased

(Compared with the time when

the engine stops working), Low

side pressure is within the

standard scope or lower the

standard

scope,

the

air

conditioner refrigeration effect

is not enough.

2.

Side pressure of high pressure is

normal, and side pressure of

low pressure is within the range

as illustration, but refrigeration

capacity of AC is not sufficient.

Refrigerant is not enough loaded

or expansion valve failure

Draw out the refrigerant

●If the refrigerant is normally loaded

1.

Change expansion valve

2.

Refill the refrigerant in the system

3.

Test the pressure again

●If the refrigerant is not enough loaded

1.

Check whether leak or not and if

there is, just repair it

2.

Refill the refrigerant in the

system

3.

Test the pressure again

High side pressure is higher than the

specified value, low side pressure

drops quickly to the standard scope or

lower than the standard scope, and the

air conditioner refrigeration effect is

not enough.

There are blocking or throttling

sites for the refrigerant pipeline

Expansion valve failure

Touch pipeline to fell the temperature

change with hands

●If each part of some parts have

temperature difference

1.Clear the blocked pipeline with

compressed air & nitrogen gas and then

change the expansion valve

2. Change the blocked parts

●If there is not failure

1.

Clear the blocked pipeline with

compressed air & nitrogen gas

2. Retest the pressure

Firstly it is high and the low side

pressure is normal but after a while

the high side pressure is higher than

the specified value, low side pressure

is within the standard scope or is

lower than standard scope so air

Expansion valve failure

There are vapor in the refrigerant

pipeline

Check the expansion valve whether or

not dirty or rusty and change if it is

necessary

●Clear the blocked pipeline with

conditioner refrigeration effect is not

enough.

High side pressure is higher than the

specified valve or too high, low side

pressure is too

high

and

air

conditioner refrigeration effect is not

enough with abnormal sound of the

compressor

(Especially

at

the

beginning of starting the engine)

The refrigerant in the refrigerant

pipeline is over loaded.

Expansion valve failure

or compressor spoiled

Draw out the refrigerant

●If the refrigerant is normally loaded

1.

Change expansion valve

2.

Refill the refrigerant in the system

3.

Test the pressure again

●If the refrigerant is obviously over

loaded

1.

1. Refill the refrigerant in the

system

2.

Test the pressure again

Note: After retest the pressure, if the

system is not still normally working,

assemble the expansion valve which has

been changed again, clear the blocked

pipeline with compressed air & nitrogen

gas and then change the compressor &

storage liquid drying tank

When switch off the engine, the high

side pressure increase a little, low side

pressure reduce a little and the air

conditioner refrigeration effect is not

enough.

Compressor spoiled

Clear

the

blocked

pipeline

with

compressed air & nitrogen gas and then

change the compressor & storage liquid

condensation tank

The high side pressure is normal, the

low side pressure is too low, the air

conditioner refrigeration effect is

normal and sometimes the evaporator

is frozen (Although the refrigerant

quantity is normal)

Expansion

valve

failure

or

compressor spoiled

Change the expansion valve

Refill the refrigerant in the system Note:

After retest the pressure, if the system is

not still normally working, assemble the

expansion valve which has been changed

again, Clear the blocked pipeline with

compressed air & nitrogen gas and then

change the compressor & storage liquid

drying tank

1.

High & low side pressure is

normal and the air conditioner

refrigeration effect is not enough

2. High & low side pressure is

normal, but the compressor has

the abnormal sound (Especially

at the beginning of starting

engine)and the air conditioner

refrigeration effect is normal

Lube oil in the air conditioner

pipeline is overloaded

Draw out the refrigerant

●Clear the blocked pipeline with

compressed air & nitrogen gas

Note: When change the air conditioner

system parts such as the compressor and

so on, the lube oil quantity should be