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
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