Chery B11. Manual — part 122

Chery B11 Service Manual

Air Conditioner-11

Section 8 Failures and Troubleshooting Analysis Table

The regular failures and its causes of A/C unit are shown in the table below.

Phenomenon

Possible Cause

Method of Troubleshooting

Warm air no hot

(1) Water pipe fall off

(2) Hot water valve failure

(3) Water pipe jam

(4) Low blower speed

(5) Blower no rotation

(6) Temperature damper not reset

(1) Remount the water pipe

(2) Replace the hot water valve

(3) Dredge the water pipe or replace the radiator

(4) Check the series resistance of blower

(5) Check the A/C motor and its circuit

(6) Adjust the temperature damper

Cooling

inadequate

or airflow insufficient

(1) Poor battery connection

(2) Air channel broken

(3) Dust filter jam

(4) Evaporator frosted

(5) Blower motor, relay or its circuit failure

(6) A/C unit blown fuse broken

(7) Refrigeration system with outside air

leakage

(8) Central damper solenoid valve or fresh

air/recirculation air vacuum valve

damaged

(1) Check the battery voltage and connector

(2) Reconnect the air channel

(3) Rinse or replace the dust filter

(4) Check the anti-frosting switch and A/C relay

(5) Check blower motor, relay and its circuit

(6) Replace the blown fuse

(7) Vacuumize, and charge the refrigerant again

(8) Check or replace the central damper solenoid

valve or fresh air/recirculation air vacuum valve

Cooling

inadequate

or airflow insufficient

(9) Refrigerant insufficient

(10) Refrigerant overabundant

(11) Refrigeration system with air

(12) Condenser radiating

pin jam or

distortion

(13) Radiator fan failure

(14) Refrigeration system with moisture

(15) Throttle pipe (CCOT valve) jam

(16) Low compressor speed

(17) Compressor no operation

(18) High-pressure pipe or components jam

or flattened

(9) Find out the leaking location, and charge

refrigerant

(10) Drain the appropriate refrigerant

(11) Fully vacuumize, and charge the refrigerant

again

(12) Rinse or replace the condenser

(13) Check fan motor and its circuit, and remove the

failure

(14) Replace the container, and vacuumize repeatly

(15) Replace the throttle pipe

(16) Check and adjust the driving V belt

(17) Check the compressor, electromagnetic clutch

and high- and low-pressure protection switches,

and remove the failures

(18) Rinse or replace the components

Compressor

abnormal noise

(1) Electromagnetic clutch slip or damaged

(2) Refrigerant insufficient or excessive

(3) Compressor bearing loose or worn

seriously

(4) Compressor refrigerating oil level low

(5) Compressor internal worn or damaged

(1) Adjust the clearance of electromagnetic clutch,

and repair the coil of electromagnetic clutch

(2) Charge the refrigerant as per the specified

(3) Replace the compressor bearing

(4) Add the compressor refrigerating oil

(5) Replace the compressor components or assy.

Chery B11 Service Manual

Air Conditioner-12

Section 9 Check Refrigeration Device by Using Manifold

Pressure Gauge Kit

This is a method to check the location of failure with the help of manifold pressure gauge kit.

Under the following conditions, the reading of manifold pressure gauge is recorded:

(a)

When the switch is turned to “RECIRC” (air recirculation), the temperature of air inlet is 30

to 35℃ (86 to 95F℃).

(b) The engine speed is 2,000 rpm.

(c) The blower fan control switch is turned to “HI-SPEED” position.

(d) The temperature controlled switch is turned to “COLD” position.

Hint: Take care that the value displayed on the instrument may change gently with the various

ambient temperatures.

WARNING:

● Take care to recycle the refrigerant before the components removal from the refrigerant pipe

and the air drainage .

● The air must be drained after the components are installed on the refrigerant pipe, and the

appropriate purified refrigerant shall be charged.

No.

Manifold Pressure Gauge Reading:

KPa (Kgf/cm

2

, lb/sq.in.)

Condition

Possible Cause

Method of

Troubleshooting

1

LO (Low-Pressure): 147 to 196

(1.5 to2.0, 21 to 28)

HI (High-Pressure): 1,422 to 1,471

(14.5 to 15.0, 206 to 213)

Cold air normal

Refrigeration device

operation normal

Chery B11 Service Manual

Air Conditioner-13

2

During the course of operation, the pressure of

low-pressure end is vacuum, and, sometimes, normal

Intermittent

refrigeration,

and

then

refrigeration

failure

Refrigeration device

with moisture

(1) Replace

the

container

(2) Remove

the

moisture from the

refrigeration

device

via

the

repeat air drainage

WARNING:

● Take care to recycle the refrigerant before the components removal from the refrigerant pipe

and the air drainage.

● The air must be drained after the components are installed on the refrigerant pipe, and the

appropriate purified refrigerant shall be charged.

No.

Manifold Pressure Gauge Reading:

KPa (Kgf/cm

2

, lb/sq.in.)

Condition

Possible Cause

Method of

Troubleshooting

● Refrigeration insufficient

● Air bubble visible from

the sight glass

Refrigerant insufficient

(1) Apply the leak detector

to detect the leaking

condition, and repair it

as required

(2) Charge the refrigerant

till that the air bubbles

disappear fully

3

The pressures of both the low-pressure end

and high-pressure end are low

● Refrigeration insufficient

● Pipe from the container to

the refrigeration device

frosting

The dirt deposited in the

container obstructs the

flow of refrigerant

Replace the container

4

The pressures of both the low-pressure end

and high-pressure end are over-high.

Refrigeration insufficient

Condenser refrigeration

insufficient

(1) Replace the condenser

(2) Check the operation of

fan motor

Chery B11 Service Manual

Air Conditioner-14

5

Excessive

refrigerant

charged

(1) Check the refrigerant

dosage,

such

as

excessive refrigerant

(2) Recycle the refrigerant

(3) Drain the air, and

charge appropriate

purified refrigerant

6

Refrigeration

device

with air

(1) Replace the container

(2) Check whether the

compressor oil is dirt

or not

(3) Repeatedly

conduct

the

air

drainage

operation to remove

the

air

from

the

refrigeration device

7

● Refrigeration insufficient

● In the low-pressure side

pipe, a large amount of

water beads appear or the

frosting

phenomenon

occurs

Expansion

valve

installation

incorrect,

and/or the heat sensing

tube

failure.

(The

opening is too wide)

(1) Check the installation

of heat sensing tube

If the result of (1) is

right,

(2) check the expansion

valve If the expansion

valve failure, replace

it

WARNING:

●

Take care to recycle the refrigerant before the components removal from the refrigerant pipe

and the air drainage .

●

The air must be drained after the components are installed on the refrigerant pipe, and the

appropriate purified refrigerant shall be charged.