Geely Diagnosis Flow. Manual part — 94

373

2).The evaporator is frosting;

Frosting on the sedan A/C evaporator can be treated according to
the following aspects:
1).The thermo expansion valve is in abnormal operation: replace the
thermo expansion valve;
2).The evaporator is deficiency in draught: find out the reason and
eliminate it;
3). Thermo sensitive resistance of the temperature controller is in
incorrect mounting position, so it is incapable of sensing the surface
temperature of the surface temperature. Install the thermo sensitive
resistance per correct position;
4). Thermo sensitive resistance of the temperature controller is out
of service so that the compressor can not stop; uninterrupted
refrigeration will lower down the surface temperature of the
evaporator. When the temperature is below 0℃, water vapor in the
air flowing through the evaporator will be frosted on external surface
of the evaporator: replace the thermo sensitive resistance;
5).Design temperature of the temperature controller thermostat is
over low that causes surface temperature of the evaporator below
0℃ to frost: replace the thermostat;

3)The evaporator assembly is
blocked

3) The ice block is caused by the moisture in the system and the
dirty block is caused by the impurities such as the aluminium chips in
the system; result of the ice block is that the evaporator is not cool
sometimes, while the result of the dirty block is that the evaporator is
not cool or is inadequate in the cooling volume: eliminate the
moisture or the impurities.

4)The thermo expansion valve
is blocked or leaked;

4).Constant malfunction of the thermo expansion valve: power head
(gas phase head) of the thermo expansion valve is leaked that
causes inadequate opening or incapable of being opened of the
thermo expansion valve, thus the evaporator is not cool or is
inadequate in cooling volume: replace the thermo expansion valve.

1).There has dirt on the
condenser flat pipe and the
heat emission fin, which will
reduce the heat transfer
capability and increase the high
pressure in the refrigeration
system;

Clean out dirt and impurities on the flat pipe and the heat emission
fin;

2).There is impurity blockage
on the condenser heat
emission fin;

Purge them with compressed air;

3).The condenser heat
emission fin is of flexural
deformation;

Calibrate it with the nipper pliers and replace the condenser if it is
severe;

Condenser

4).The condenser is leaking;

Replace the condenser

1)Dry reservoir assembly is
blocked;

The block reason is the pulverizing of the drier as well as too many
impurities in the system; the phenomena is that the high pressure is
increased and there has apparent temperature difference between
inlet and outlet of the dry reservoir assembly: replace the dry
reservoir;

Dry reservoir

2)Filter screen inside the dry
reservoir assembly is damaged;

Thermo expansion valve maybe blocked so that the a/c will not
refrigerate: replace the dry reservoir and check the thermo
expansion valve;

374

1).The hose is aging damaged; Replace damaged hose assembly;

2).The connection is loose;

Retighten the connection or replace the hose assembly;

3).The connection thread is
damaged;

Replace the hose assembly;

Pipeline assembly

4).O seal ring is damaged;

Replace O seal ring. The above failures will cause the refrigerant
leaking;

1).Wire of the blower or the fan
is broke off;

Reconnect the fan wire;

2).Motor of the fan or the
blower is damaged

Replace the blower or the fan;

3). Fuse of the blower or the fan
is blown out or the switch is in
bad contact;

Check and replace the fuse, eliminate the switch bad contact;

4).Governing resistance of the
blower is damaged;

Replace the governing resistance;

Blower and condenser
fan

5).The fan blade is battered

Replace the condenser fan (the above failure will cause deficiency in
fan draught or no draught of the fan so that the high pressure will be
abnormally high; deficiency in the blower draught or no draught of
the blower will cause the evaporator to frost, deficiency in heating air
or no heating air);

375

Diagnoses flow of air-conditioning system constant malfunction

376

Solution to auto a/c Constant malfunction: Auto air-conditioning system of Vision and Leading
models are provided with failure self-diagnostic function. Some basic failures can be checked by
the self checking function. In addition, we have enumerated some familiar failure symptoms and
treatment processes, according to which you can find out the failure reasons and help your
clients to solve the problems.

No.273 Vehicle temperature sensor is in poor condition

(code display 01)

No.274 The vehicle exterior temperature sensor is in poor condition;

(code display 02)

The a/c controller is in poor condition

B3 and B2 metal plug-in card inside B plug are in
poor contact with the controller socket;

1. Harness or metal plug-in connected with B3 and b2 is in
poor condition;
2. The vehicle temperature sensor is in poor condition.

Test the ohmic value between B3 and B2 of B plug at the harness end with the meter

Pull out B plug behind the control panel

Power on and test if the voltage between B3 and B2 is0.5V≤Vi≤4.8V

Yes

Vehicle interior temperature sensor

Is the ohmic value between 500 and
100K?

Yes

No

B2

B3

The a/c controller is in poor condition

A12 and A11 metal plug-in card inside A plug are in
poor contact with the controller socket;

1. Harness or metal plug-in unit connected with A12 and A11 is
in poorcondition;
2. The vehicle exterior temperature sensor is in poor

condition.

Test the ohmic value between A12 and A11 of A plug at the harness end with the
meter

Pull out A plug Aehind the control panel

Power on and test if the voltage between A12 and A11 is 0.5V≤Vi≤4.8V

Yes

Vehicle exterior temperature sensor

Is the ohmic value between 500K and
100K?

Yes

No

A11

A12

A/C controller

No