Great Wall service chassis and body Manual - part 93

AC-16

Air-Conditioning System

 Refrigeration Device

Refrigeration device

On-vehicle inspection on expansion valve

1.

Check the gaseous refrigerant quantity in the refrigeration

cycle;

2.

Mount the manifold gauge;

(see Page AC-12)

3.

Run the engine;

Run the engine at a speed of 2000 r/m for five minutes.

4.

Check the expansion valve;

If the expansion valve is blocked, the LP readings will reduce

to 0 kPa, otherwise, the valve is normal.

Disassembly of Refrigeration Device

1.

Disconnect the cathode lead from the storage cell;

2.

Exhaust the refrigerant;

3.

Tear down the suction pipe from the entrance joint of

refrigeration device;

4.

Tear down the outlet pipe from the entrance joint of

refrigeration device;

Remark: the opened joint should be sealed with the cork to

prevent the humid air from entering into the system.

5.

Tear down the insulation rings from the inlet and outlet

joints.

6.

Tear down the right glove box (SY rear air-conditioner:

tear down the interior trim panel at left rear side).

7.

Disconnect the plugging element;

8.

Tear down the refrigeration device;

Tear down the three nuts.

refrigeration device

SY

interior trim panel
at left rear side

rear evaporator

AC-17

Air-Conditioning System

 Refrigeration Device

evaporator housing

Dr SF

SL SK SY SJ

evaporator housing

residual liquid pipe

heat-sensitive
resistance

pressure switch

evaporator core

expansion valve

heat-sensitive

resistance

evaporator upper

housing

evaporator core

evaporator lower

housing

expansion valve

HPpressure rubber

LPpressure rubber

HP/LP pressure rubber

AC-18

Air-Conditioning System

 Evaporator

SYrear evaporator

upper housing

air cover

lower housing

temperature controller

air blower

evaporator core

air pipe

heat-sensitive resistance

1.

Tear down the evaporator housing:

(a)

Disconnect the plugging element;

(b)

Tear down the two clipes;

(c)

Tear down the four screws;

(d)

Tear down the upper cluster housing;

(e)

Tear down the HP/LP pressure pipe rubber washers; and

(f)

Tear down the lower cluster housing.

2.

Tear down the expansion valve:

(a)

Tear down the liquid pipe from the entrance joint of

expansion valve;

(b)

Tear down the sealing washer and thermal bulb from the

suction pipe of evaporator;

(c)

Tear down the expansion valve.

expansion valve

HP pipe

LP pipe

AC-19

Air-Conditioning System

 Refrigeration Device

inspectionofevaporator

1.

Check the radiating ribs of evaporator to see whether there is

block.

If the radiating rib is blocked, clean it with the compressed air.

Notice: do not wash the evaporator with water.

2.

Check the joint to see whether there is crack or scrape.

Make reparation as requirement.

Mount the evaporator parts:

(a)

Connect the expansion valve to the entrance joint of evaporator

and screw up the nuts.

Remark: Carefulness should be put on the O-ring seal.

(b)

Mount the bracket on the suction pipe with thermal sensor;

(c)

Connect the liquid pipe to the entrance joint of expansion

valve and screw up nuts.

(d)

Mount the lower cluster housing on evaporator.

(e)

Mount the upper cluster housing;

(f)

Mount the four screws;

(g)

Mount the two clipes;

(h)

Mount the HP/LP pressure rubber washer; and

(i)

Connect the plugging elements;

1.

Mount the refrigeration device.

Mount the refrigeration device with three nuts.

2.

Connect the plugging elements;

3.

Mount the right glove box (SY rear air-conditioner: mount the

interior trim panel at left rear side).

4.

Mount the insulation ring on the inlet and outlet joints;

5.

Connect the liquid pipe to the outlet joint of refrigeration device;

Tightening moment

(see page AC-8)

6.

Connect the suction pipe to the outlet joint of refrigeration pipe;

Tightening moment

(see page AC-8)

7.

Connect the cathode lead to the storage cell.

8.

Vacuumize the air-conditioning system:

Vacuumizing time:

Dr SL SK SF SJ

vacuumize for 20min and maintain the

pressure for 30min
SY: vacuumize for 30min and maintain the pressure for
another 30min.

9.

Inflate the refrigerant in the air-conditioning system and

check to see whether there is air leakage;

Refrigerant quantity:

Dr

(600-650)g

SL

700 
 0g

SK SJ

560 
 0g

SF

(700-720)g

SY

850 
 0g

expansion valve HP pipe 

LP pipe