Page 321 of 392

314Have a focus inspection on the following area:
a. Each pipe union joint and valve connection.
b. All hose, especially near the pipe union.
c. Compressor shaft seal, front and rear cover, gasket, oil fill plug.
d. Area on the surface of the condenser and evaporator that is scratched, bruised or damaged.
e. Expansion valve inlet and outlet connection and temperature sensor element and the welding position.
3. Check the Refrigerant
Observing from the sight glass, you may understand the refrigerant status and analyze the possible faults:
4. Check Other Parts
Other parts needed to be checked and their check points:Conditions obse rvedP ossible proble ms
Cle ar, no a ir bubble , A/C e mits c ool wind Re frige ra tion system is normal
Cle ar, no a ir bubble , A/C e mits warm wind Re frige ra nt le a ke d, the re is le aka ge in the syste m
Occ a tiona l a ir bubble . Expa nsion va lve is froste d There is wa te r mixe d in the re frigeration syste m
Occational air bubble. Insufficient refrigerant or air mixed in the system
Cle ar, the re is oil stripe on the gla ss Outle t is not c old, no refrige ra nt
Foamy and turbid Excessive freezing oilChecked PartCheck Points
The re sha ll be no dirt and rust on the radiator tha t hinde r the he at
exchange;
The ra dia tor surfa ce ha s no da mage , fissure a nd hidde n trouble tha t ma y
cause refrigerant leakage.
Elec tromagne tic Clutc hClutc h ope ration is norma l. Whe n switche d on, the c ompre ssor sha ll
operate, clutch can not slip.
Compre ssor Be lt Be lt te nsion of 250N is normal, belt is not broke n and dama ged.
WireThe electromagnetic clutch and blower power cable shall be not damaged
and overheated; the connection shall be reliable, and the protective
gromme t through the me tal plate sha ll be ke pt good a nd without da ma ge .
HoseRefrigerant hose and condenser pipe shall be secured and shall not be
dama ged by a pproac hing the othe r ove rhe ate d pa rts, moving pa rts a nd
sha rp parts. Eva pora tor Conde nse r
Page 367 of 392

360(I) Front Sheet Metal, Cowl PartsThe main function of the front sheet metal and the cowl parts is forming an engine compartment to supply the
engine and accessories with a protective cover and to absorb the most energy when vehicle encounters
frontal impaction, protecting mud from being splashed by the front wheels, and meeting the requirements of
body design in appearance. It is mainly composed of front cross member assembly, LH/RH front mud guard
and front side member assembly, engine hood front support plate assembly, hood lock bracket assembly,
cowl assembly, cowl upper assembly.
1. Front Cross Member Assembly
The front cross member assembly is mainly composed of the front cross member welding sub-assembly,
front cross member bottom plate assembly, LH/RH side member end plate by welding them together, and its
dismantle diagram as shown in the Figure 5-2.
2. Lh/Rh Front Mudguard And Front Side Member Assembly
LH/RH front mud guard and front side member assembly is mainly composed of LH/RH front mudguards
and LH/RH side members by welding them together.
It is mainly used to mount some mounting brackets such as the engine LH/RH side suspension bracket, LH/
RH front suspension shock absorber bracket, etc. and to mount the LH/RH front fenders.
3. Engine Hood Front Support Plate Assembly
Engine hood front support plate is mainly composed of LH/RH headlamp mounting bracket assembly, hood
front support plate sub-assembly, and LH/RH front support plate reinforcement, by welding them together.
Engine hood front support plate assembly is used to mount radiator, engine hood lock, radiator grille, front
bumper, and headlamp.
4. Engine Hood Lock Bracket Assembly
Engine hood lock bracket assembly is used to mount the engine hood lock, also to strengthen the intensity and
rigidity of the front body by connecting the engine hood front support plate and front cross member.
5. Cowl Assembly
Cowl assembly is mainly composed of cowl inner and outer plate assembly and cowl lower cross member, by
welding them together.
Cowl assembly and front floor, LH/RH front mud guard (LH/RH front pillar), cowl upper baffle is welded
together, which forms a framework with great torsional strength. It generates great resistance to lateral
impact and rolled deformation.
Cowl inner and outer plate assembly is sandwich structure. 3mm of asphalt plate lies in the interlayer, which
is to cut off the noise and heat generated from the engine.
Page 386 of 392

379In order to avoid corroding and effectively extend the service life of the punching parts, galvanized steel
sheet with different specifications is widely adopted on the body (Figure 5-23).
(Figure 5-23) Galvanized Steel Plates
1. LH/RH Mudguard Reinforcement 2 Cowl Upper Baffle 3 Radiator Support
4 LH/RH Front Mudguard 5 LH/RH Front Side Member 6 Front Low Cross Member
7 Rear Floor 2nd Cross Member 8 LH/RH Rear Floor Side Rails 9 LH/RH Floor Side Member Inner
Plate 10 Cowl Lower Cross Member 11. Cowl Panel
2. Vibration Reduction And Sound Insulation
1 11 1
1Take measures on the structure of the body
a. Reasonably layout reinforcing ribs to improve the rigidity of parts and to reduce noise by restraining
vibration.
b. Fill the floor joint seam with sealant to strengthen the floor sealing and weaken the noise.
c. Increasing the thickness of the cowl is very effective to insulate sound. The cowl is adopted
sandwich structure, (Figure 5-24) that is, the cowl is welded by two steel plates (Cowl and heat
insulating board), and in the interlayer of the 2 plates lies a heat insulating pad (the material of it is
asphalt piece).87 5
4 4 21
9 10 63
11
Page:
< prev 1-8 9-16 17-24