Great Wall Florid. Manual — part 52

GWFLORID Maintenance Manual

206

Failure

Symptoms

Cause analysis

Heating sys-

tem

No or insuffi-

cient heating

Air conditioner blower malfunction

Blower relay damaged

Hot air duct blockage

Cooling water pipe blockage

Temperature change throttle actuator damaged

Coolant insufficient

Blower does

not work

Fuse blown or ill switch contact

Blower motor burnt out

Blower's high speed relay broken

Speed adjustive resistance damaged

Open circuit

Water leakage

Heater water pipe degradation, poor connection

Over heated

Fan's speed adjustive resistance damaged

Temperature change throttle actuator damaged

Defroster’s hot

air insufficient

Mode cable damaged

Vent is not in place

Air outlet blockage

Insufficient heating

Air duct mounting

Open circuit

Troubleshooting (Continued)

207

Air Conditioning System

Air Conditioning System's Structure Diagram and Fundamentals

Air Conditioning System Overview

Basic composition

Composed of air conditioner, compressor assembly, condenser

assembly, pipeline, defroster system, heating & ventilation

system, etc. The air conditioner also includes evaporator and

blower components.

Function

This system is a manually controlled air conditioning

system, with steam compression as its cooling method.

Residual heat water warming is the heating method the

engine adopts. Inner & outer circulation, blowing mode,

and cold & warm temperature adjustment are all controlled

by individual cables from the air conditioning controller. It

achieves ventilation, warming, and cooling integration.

Caution: While starting the compressor, you must open

the air regulation knob first, otherwise it cannot start.

Operation

The compressor is driven directly by the engine. High

temperature and high pressure refrigerant vapor exhausted

from the compressor will pass through the high pressure

pipe into the condenser, dissipate the heat via temperature

difference, and then form a high pressure liquid. High

pressure liquid passes through the accumulating dehydrator

into the expansion valve, and after passing through the

throttle valve, it becomes a low pressure liquid. Heat

exchange via the evaporator will cool down the room’s air,

and then the refrigerant inside the system will become a low

temperature and low pressure vapor, which is then sucked

into the compressor and compressed into high temperature

and high pressure air again. Thus a cooling cycle is formed.

The circulation continues, which maintains a comfortable

temperature inside the vehicle.

Expansion valve

Compressor

Condenser fan

Condenser

Pipeline

Air conditioner

Accumulating

dehydrator

GWFLORID Maintenance Manual

208

Air Conditioning System Terminal Definition

Pin

Interface signal

Pin

Interface signal

A

Emergency lamp relay

2

Parking lamp drive +

B

Power supply (+)

3

Safety indicator

lamp drive +

C

Ground

4

Blower LO gear drive +

D

Power supply

5

Blower common

terminal GND

E

Air conditioner

request signal

6

Blower HI gear drive +

F

Blower relay

9

Blower M1 gear drive +

10

Blower M2 gear drive +

Air conditioner switch

Hazard warning switch + rear defroster switch

Blower + night lighting + safety instruction

Cylinder

Blade

Exhaust valve

Rotor

Exhaust

valve

Compressor

Entire outline structure (shown on the left)

Rotary vane compressor’s operation

As the diagram shows, when the rotor is rotating under an

external force, due to the synergism of centrifugal force and the

oil pressure difference on the five vanes of the rotor, their edge

clings to the cylinder wall. Because the fixed cylinder is oval

shaped, while rotating on the rotor, the rotor vanes spread and

retract according to the cylinder's geometrical shape, which in

turn makes the crescent shape consisting of the cylinder, vanes,

etc. to change continuously, so as to achieve the functions of

suction, compression, and exhaustion.

209

Air Conditioning System

Compressor Removal

1. Hoist the vehicle with a jack.

2. Remove the bottom mudguard.

3. Remove the compressor.

Compressor Installation

Before installing, manually rotate the compressor several

circles, allowing each component in the relative motion to be

covered with lubricant.

Clearance between the compressor's auricular branch and

bracket should be less than 0.1 mm. If the clearance is too

big, fill the clearance with a washer.

1. Loosen the engine's adjusting bolt firstly, take down the

engine belt, and then change the compressor belt.

2. Fix the compressor bracket onto the engine body with

the bolts. The bracket must be fastened tightly with suf-

ficient intensity. Fix the compressor bracket onto the

engine with four M10 ×1.25 (Q1461030 FD) bolts and

a tightening torque of 45±5 N·m, and then install the

compressor onto the bracket with a tightening torque of

22±3 N·m.

3. Take off the suction and exhaust cap. Select the

suction duct and exhaust duct that matches the size

of the suction and exhaust port to connect with each

other (size of suction and exhaust port shown in the

diagram). Then tighten the coupling bolt.

Water pump pulley

Engine pulley

Tensioner pulley

Steering

pump pulley

Crank pulley Compressor pulley

Suction port (S-end) size

Exhaust port (D-end) size

C-C

2:1

B-B

2:1

4. Put the 4PK850 type compressor belt onto the pulley,

and then adjust the bracket to make the belt reach the

specified tension. That is, if a force of 100

-

120 N is

used on the belt, deformation of the belt is 8

-

10 mm.

5. Insert the thermal protector plug into the relevant plug

of the air conditioning system's wire harness.