Geely Diagnosis Flow. Manual part — 93

369

A/C compressor fails to start

Fuse, electric appliance element
and relay are in trouble

Malfunction of low pressure
switch

Malfunction of temperature
controller

High pressure switch

The electromagnetic clutch can not be
sucked together

The refrigerant is
leaking

The compressor bearing is damaged or oil
shortage

The electromagnetic
clutch can’t work

The compressor is of piston
seizure

Overhaul or replace

Replace

Overhaul or replace

Overhaul or replace

Overhaul or replace

Overhaul

Replace

Replace

Overhaul or replace

Short circuit of ECU

Replace the ECU
assembly

Normal

Abnormal

Abnormal

Unable to suck

Abnormal

Abnormal

Leaking

Damaged

Cylinder sticking

Abnormal

Abnormal

370

No. 270 The A/C control mechanism is hard to operate

Malfunction
symptom

Cause Solution

Manipulating key of the control
mechanism and rocker on the shell
body are heavy

1).Manipulating key of the control mechanism and rocker on the shell
body are heavy: spread lubrication oil at the sliding part of each
revolving member.

The A/C control
mechanism is
hard to operate

The air throttle is ineffective in
rotation

2).The air throttle is ineffective in rotation: repair the air throttle.

No. 271 The A/C evaporator is frosting

Malfunction symptom

Cause

Solution

The thermo expansion
valve can’t work

1).The thermo expansion valve is in abnormal operation: replace the
thermo expansion valve;

.Thermo sensitive
resistance of the
temperature controller is
mounted in incorrect
position

3). Thermo sensitive resistance of the temperature controller is
mounted in incorrect position, so it is incapable of sensing the surface
temperature of the evaporator. Install the resistance in correct position;

Malfunction of thermo
sensitive resistance of
the temperature
controller

4). Thermo sensitive resistance of the temperature controller fails so
that the compressor can not stop; uninterrupted refrigeration will lower
down the surface temperature of the evaporator. when the temperature
is below 0 degree, water vapor in the air flowing through the evaporator
will be frosting on external surface of the evaporator: replace the
thermo sensitive resistance;

The A/C evaporator is

frosting during the operation

Temperature of the
temperature controller
thermo sensitive
resistance is set too low

5).Temperature of the temperature controller thermo sensitive
resistance is set so low, causing surface temperature of the evaporator
below 0 degree to frost: replace the thermo sensitive resistance;

The A/C control mechanism is hard to

operate

Manipulating key of the control mechanism

and rocker on the shell body are heavy

The air throttle is ineffective in

rotation

Overhaul

Overhaul

Normal

Heavy

Blocked

371

The a/c evaporator is frosting

The thermo expansion valve is in
abnormal operation

The evaporator is deficiency in draught

Thermo sensitive resistance of the
temperature controller is in incorrect
mounting position

Thermostat of the temperature controller is out of
service

Design temperature of the temperature
controller thermostat is over low

Replace

Overhaul

Re-mount

Replace

Replace

Normal

Normal

Correct

Normal

Abnormal

Deficient

Incorrect

Abnormal

Abnormal

372

No. 272 Constant malfunction and solution of A/C components

Spare parts name

Constant malfunction

Preclusion method

A/C relay

1).The contact is superficial charring;
2).The relay coil is burnt out;
3).The spring leaf is damaged and incapable of
sucking;

1).Connection check: bridge a wire at the suction position
of the relay. If the compressor or the fan is in normal
operation after the bridging, it means there is failure in the
relay;
2) Displacement method check: replace into a new relay
of the same type and specification to make the judgment
of the original relay. When replacing the damaged relay, it
shall adopt the relay of the same model and specification
and the relay position shall not be changed randomly;

1).Cylinder sticking and cylinder scoring of
compressor; the link rod is breakout; the pulley
does not rotate or is hard to rotate; there has
abnormal sound;
2).Valve leaf and valve plate of the compressor
is damaged and there has abnormal sound;
3).The compressor sealing gasket is breakdown
that result in coalition between high and low
pressures; high pressure is the same as the low
pressure;
4).The compressor shaft seal is leaked that
causes large leakage of the refrigerant;

Replace into a new compressor of the same model;

5).Pulley bearing is damaged. Ultra large belt
tension will generate too much radial bearing
force, and the suction cup will be seized with the
pulley thus damage the bearing;

Replace the electromagnetic clutch and adjust the belt
tensioning force;

6).Coil of the electromagnetic clutch is short or
broken so that the suction can not be generated;
7).Clearance between the suction cup and the
pulley is too small that causes the sticking or the
seizure between the suction cup and the belt
surface, or even the pulley charring;
8).Fuse of the electromagnetic clutch is blown
out;

Replace the electromagnetic clutch;

Compressor

9). The electromagnetic clutch is slipping;
suction between the pulley and the suction cup
is inadequate that causes the slippage;

Reason of insufficient suction and its preclusion method:
(1).The electromagnetic clutch is insufficient in the power
supply voltage: recharge the battery;
(2).A/C relay is in poor contact: check the relay and
replace it if anything wrong with it.
(3).There has too much refrigerant or the compressor is
of piston seizure that causes excessive load; discharge
the surplus refrigerant or replace the compressor;
(4).The electromagnetic clutch has slipping sound caused
by the belt slippage; re-tension the belt;

Evaporator

1).The evaporator is leaking that causes the
shortage of refrigerant or no refrigerant; the
result is that the evaporator is insufficient in the
cooling volume or does not refrigerate.

Replace the evaporator assembly or the evaporator.