Content .. 90 91 92 93 ..

Great Wall service chassis and body Manual - part 92

AC-12

Air-Conditioning System

Compressor

Installation of manifold gauge

Remark: Connect the manifold gauge to the auxiliary valve of

compressor.

Turn off the manual valve of manifold gauge.

Mount the packing hose of manifold gauge on the packing

valve.

Mount the LP hose to the LP packing valve and the HP hose to

HP packing valve. Then screw up the nuts for hose joint by

hand.

Remark: Do not coat the compressor lubricant on the connec-

tion positions.

packing hose

efrigeration system

connected to mani-

fold gauge

connect to compressor

turn off

Compressor

On vehicle inspection

Mount the manifold gauge;

(see manifold gauge mount)

Run the engine at the speed of 1500 r/m or so;

Check the compressor according to the following items:

(a)

The HP gauge readings under the normal system should

satisfy the specified value of (1.4-1.7)MPa , that of LP

gauge should meet the specified value of (0.15-0.2)MPa .

(b)

Whether there is abnormal sound;

(c)

Whether there is leakage at the shaft oil seal.

If any problem is found, repair or change the compressor.

Check the electromagnetic clutch:

(a)

Check to see whether there is lubricant trace on the

pressing plate and rotor;

(b)

Check to see whether there is noise or lubricant leakage

at the clutch bearing;

(c)

Measure the resistance between the stator coils that is set

between the clutch lead and the grounding lead with the

ohmn meter.

Standard resistance:

SL SK SJ

(3.2 .2)

Ω

Dr SF SY

(3.5 .2)

Ω

In case the requirement is not satisfied, change the compressor.

AC-13

Air-Conditioning System

Compressor

Disassemble of compressor

Run the engine in the idle status for ten minutes under

the air-conditioning situation;

Turn off the engine;

Disconnect the cathode lead from the storage cell;

Disconnect the electromagnetic clutch lead from the

matching wire;

Exhaust the refrigerant from the refrigeration system;

Disconnect the two hoses from the auxiliary valve of

compressor;

Cover the opening joint with cork right away to prevent the wet

gas entering in to the system.

Tear down the compressor:

(a)

Tear down the fan cover;

(b)

Loosen the driving belt;

(c)

Tear down the fixing bolts of compressor bracket and the

compressor.

Mount of compressor

Mount the compressor with fixing bolts;

Tightening moment

(25-30)Nm

Mount the driving belt correctly;

Requirement for belt tension: the tension belt is allowed
to reduce (9-13)mm under 98N after the compressor
runs for five minutes;

Connect the two hoses to the auxiliary valve of

compressor;

Tightening moment

(see page AC-8)

Connect the clutch lead to the matching wire;

Connect the cathode lead of storage cell to the storage

cell, and

Vacuumize the system and inflate the refrigerant:

Vacuum time:

Dr SL SK SF SJ

Vacuumize for 20min and main-

tain the pressure for 30min;
SY

Vacuumize for 30min and maintain for 30min

Inflated refrigerant quantity:

(600-650)g

700 0g

SK SJ

560 0g

(700-720)g

850 0g

correct

incorrect

98N

AC-14

Air-Conditioning System

Liquid Tank

Check to see whether there is leakage in observation window,

fusible plug and joints;

Conduct the inspection with the gas leakage detector and, if

necessary, repair or change the liquid tank.

Dismantle of Liquid Tank

Exhaust the refrigerant;

Tear down the two liquid pipes from the liquid tank;

Remark: the opened joint should be plugged with cork so as to

prevent the humid air from entering into the system.

Tear down the liquid tank from the tank bracket.

Mount of Liquid Tank

Mount the liquid tank on the liquid tank bracket;

Remark: the cover of joint should not be take down before

connecting the pipe;

Connect the two liquid pipes to the liquid tank;

Tightening moment

(See page AC-8)

Vacuumize the system and inflate the refrigerant in;

Vacuumizing time:

Dr SL SK SF SJ

Vacuumize for 20 min and main-

tain the pressure for 30min;

Vacuumize for 30 min and maintain the pres-

sure for 30min.

(600-650)g

700 0g

SK SJ

560 0g

(700-720)g

850 0g

liquid pipe

condenser

liquid tank

liquid pipe

liquid tank

condenser

SL SK SY SJ

Dr SF

AC-15

Air-Conditioning System

Condenser

Condenser dismantle

Check the radiating ribs of condenser to see whether

there is blocking or damage;

if the radiating rib is blocked, wash it with water and dry it with

compressed air.

Notice: be careful not to damage the radiating rib;

Check the condenser joint to see whether there is leakage;

Make reparation as requirement;

Condenser disassembly

Exhaust the refrigerant;

Tear down the median mesh and the bonnet lock bracket;

Disconnect the outlet hose from the entrance joint of

condenser;

Tear down the liquid pipe from the outlet of liquid tank;

Remark: the opened joint should be plugged with cork so as to

prevent the humid air from entering into the system.

Tear down the condenser:

Tear down the two bolts.

Condenser mount

Mount the condenser

Screw on the two bolts so that the rubber washer contacts the

mounting flanges correctly.

Connect the liquid pipe to the liquid tank and the outlet

hose to the condenser.

Tightening moment

(See page AC-8)

Mount the median mesh and the bonnet lock bracket;

vacuumize the air-conditioning system;

Vacuumizing time:

Dr SL SK SF SJ

vaccumize for 20min and main-

tain the pressure for 30min;

vaccumize for 30min and maintain the pres-

sure for another 30min.

Inflate the refrigerant in the air-conditioning system and

check to see whether there is air leakage:

(600-650)g

700 0g

SK SJ

560 0g

(700-720)g

850 0g

liquid pipe

condenser

liquid tank

liquid pipe

condenser

liquid tank

SL SK SY SJ

Dr SF

liquid pipe

outlet hose

liquid pipe

Content .. 90 91 92 93 ..