Chery A15. Manual — part 144

The air conditioning unit of Chery A15 car is divided into five basic composition parts as per

different functions, namely cooling system, heating system, ventilation system, control system

and air purification system.

(1). Cooling system adopts vapor compression refrigeration theory to cool down the air in car

compartment. As the cooling sources, the evaporator’s temperature is even lower than dew

point, therefore the cooling system also has the functions of dehumidification and air

purification. The cooling system of Chery electric-controlled fuel injection engine car uses

R134a coolant. As shown in the figure, the cooling system mainly consists of compressor,

condenser, expansion valve, evaporator, etc. Liquid coolant in evaporator absorbs heat in the

air in car compartment and is gasified into low-temperature and low-pressure coolant vapor

and then absorbed by compressor which compresses coolant vapor into high-pressure and

high-temperature gas and transmits it to condenser, where the coolant is cooled by ambient air

and condensed into fluid after releasing heat, and then is dewatered by fluid reservoir. The

high-pressure and high-temperature coolant fluid is throttled by expansion valve (fixed in

evaporator inlet tube) to lower the pressure and temperature, and then reenters evaporator.

The low-temperature and low-pressure coolant fluid then again absorbs heat in car

compartment and is regasified into low-temperature and low-pressure coolant vapor to be

reabsorbed by compressor. By this continuous circulation, the cooling system lowers the

temperature inside car.

蒸发器：Evaporator 空调控制系统：Air conditioning control system 暖风水箱：Warm air water tank

压缩机：Compressor 冷凝器及管路：Condenser and pipeline

(2). Heating system adopts engine coolant as heating source and induces engine coolant into

the warm water tank in car compartment, then heats the air inside by blower, meanwhile

defrosts and demists windshield. The air conditioning unit of Chery A15 car is of a reheating

combination style, which means that heating system can independently heat the circulating air

inside car compartment or fresh air outside, or cool these two kinds of air together first and

then heat all or part of the mixture air to obtain desired air temperature. The air conditioning

unit of Chery A15 car is of a reheating combination style, which means that heating system

can independently heat the circulating air inside car compartment or fresh air outside, or cool

these two kinds of air together first and then heat all or part of the mixture air to obtain

desired air temperature. In this way, it is possible to obtain clean air with appropriate

humidity after dehumidifying and filtering the air.

(3). The centrifugal blower of ventilation system works to ventilate the car compartment in

addition to cooling and heating the air in the compartment. Ventilation system consists of air

filter, air inlet, air duct, air outlet, etc. Ventilation system induces outside fresh air into car

compartment, and air outlet exhausts the vitiated air out of the compartment. Two ventilation

forms are available with Chery A15 car, namely natural ventilation and forced ventilation.

Fresh air/circulating air vacuum valve controls the fresh air inlet to open or shut off.

In natural ventilation, fresh air enters backup tank from the air inlet located under windshield

(positive-pressure area) and the safety belt slot on backup tank cover, and then goes out

through rear boarding of vehicle body, backup tank lining and air outlet on rear longitudinal

beam (negative-pressure area) into atmosphere. The air moving in rear part of vehicle body

defrosts the rear window, and the non-pressure process avoids noises and interference with

running speed of vehicle.

In forced ventilation, fresh air compressed by blower enters car compartment from various air

ducts without going through warm air radiator (mixing throttle closed), and then goes out in

the same way as in natural ventilation.

(4). Control system mainly consists of electrical elements, vacuum tube and control

mechanism. Control system controls temperature and pressure in cooling and heating systems,

air temperature and airflow in car compartment, and also air-out direction.

空调压缩机：Air conditioning compressor 蒸发器总成：Evaporator assembly

空调线束：Air conditioner wire harness 电线：Wire

(5). Air purification system is mainly of a dust filter, which serves to filter the air induced

from outside and exhaust vitiated air in car compartment to purify the air inside.

Section Nine: Troubleshooting Table

1. Installation Precautions of Air Conditioning System

(1). Pipeline fastened by dual-nuts must be installed with two wrenches to avoid deformation

or cracking of pipeline;

(2). Use nitrogen or coolant gas instead of compressed air to clean pipelines;

(3). Install properly and follow all tightening torque requirements;

(4). Check all parts to ensure undamage and no mutual interference of neighboring parts.

(5). Perform leakage test to ensure that the whole system is free of any leakage.

2. Common Faults and Causes of Air Conditioning System

Symptom Possible

Cause

Solution

No warm

air

(1) Water pipe comes off

(2) Warm air water valve defect

(3) Water pipe blockage

(4) Low blower speed

(5) Blower not working

(6) Bad returning of mixing throttle

(1) Refasten water pipe

(2) Replace warm air water valve

(3) Dredge water pipe or replace radiator

(4) Check blower serial resistors

(5) Check blower and circuit

(6) Adjust mixing throttle

Insufficient

cooling or

air flow

(1) Battery defect

(2) Air duct shut off

(3) Dust filter blockage

(4) Evaporator frosted

(5)

Blower motor, relay or circuit fault

(6) Air conditioner fuse burned

(7) Exterior air in cooling system

(8)

Central air throttle electromagnetic

valve or fresh air /circulating air

vacuum valve damage

(9) Insufficient coolant

(1) Check battery terminals

(2) Reconnect air duct

(3) Clean or replace dust filter

(4) Check defrost switch and air conditioner relay

(5) Check blower motor, relay or circuit

(6) Replace fuse

(7) Vacuumize system and add new coolant

(8)

Check or replace central air throttle electromagnetic

valve or fresh air /circulating air vacuum valve

(9) Check for leakage and add coolant