1991 MITSUBISHI 3000GT Service Manual

HEATERS AND MANUAL AIR CONDITIONER - Blower Assembly55-23
BLOWER ASSEMBLY
M55KA- _
/REMOVAL ANDINSTALLATION2OFOO79
Removal steps of blower case assembly
1. Stopper
2. Glove box
3. Glove box outer
case assembly
4. Under cover
5. Lower frame
6. Evaporator mounting bolt and nut

l a7. Connection of the air-selection wire
8. Side frame
9. Blower assembly
*+ 10. Blower motor assembly11. Blower case assemblyRemoval steps of blower
motor assembly
4. Under coverl * 10. Blower motor assemblyTSB Revision

55-24
IHEATERS AND MANUAL AIR CONDITIONER
- Blower Assembly
INSPECTIONM55KCAMl Check for bending or abnormal deflection of the rotating
Ishaft of the blower motor assembly.
l Check for cracking or deterioration of the packing.
l Check for damage to the fan.
d’l Check for damage to the blower case.
l Check the operation of the inside/outside air-selection
damper, and for damage.
16LO28C
BLOWER MOTOR ASSEMBLY CHECK(1) Disconnect the blower motor terminals.
(2) Connect the blower motor terminals directly to the batteryand check that the blower motor operates smoothly.
(3) Next, reverse the polarity and check that the blower motoroperates smoothly in the reverse direction.
SERVICE POINTS OF INSTALLATIONM55KDAH
10. INSTALLATION OF BLOWER MOTOR ASSEMBLY
Before installing the blower motor assembly, carefully clean
away any dust, dirt, etc. adhering to the inner surface of the
blower case.7. INSTALLATION OF AIR SELECTION CONTROL WIRE
Connect the air selection control wire to the air selection
damper lever by following the steps below.
(1) Move the air selection control lever to the CQ position.
(2) With the air selection damper lever pressed inward in
the direction indicated by the arrow, connect the inner
cable of the air selection control wire to the end of the
air selection lever, and then secure the outer cable byusing a clip.
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HEATERS AND MANUAL AIR CONDITIONER - Evaporator55-25
EVAPORATOR
M55RA- -
/REMOVAL AND INSTALLATION
9.0- 11 Nm
7.0 - 8.0 ftlbs.
i
O-ringRemoval steps
l *I, Connection of liquid pipe and suction hose
2. O-ring
3. Drain hose
4. Stopper
5. Glove box
6. Glove box outer case assembly
7. Under cover
8. Lower frame
9. A/C control unit
10. Evaporator
Pre-removal and Post-installation Operationl Discharge and Charging of Refrigerant
l Removal and lns~allation of Battery
SERVICE POINTS OF REMOVALM55RBAl
1.DISCONNECTION OF LIQUID PIPE AND SUCTION HOSEIf the hoses or pipes are disconnected, cap the hoses or
pipes with a blank plug to prevent entry of dust, dirt, and
water.
INSPECTIONM55RcADl Check for damage of the evaporator fin part.
l Check for damage or collapse of the drain hose.
l Check for peeling or cracking of the insulator.
FIN-THERM0 SENSOR AND AIR-INLET SENSOR CHECK
For information concerning the checking procedures, refer to
P.55-11.
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55-26HEATERS AND MANUAL AIR CONDITIONER - Evaporator
DISASSEMBLY AND REASSEMBLYM55RE- -Compressor oil: Freol S-83 or
Suniso 5GS
Disassembly steps
4*1. Clips
2. Evaporater case (upper)3.
Fin therm0 sensor4. AirInlet sensor
4*

5. Evaporator case (lower)
6.Evaporator assembly
7.Grommet8.Insulator9.Rubber insulator10.Clip11. Expansion valve
10/
9
/2OFOO40
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SERVICE POINTS OF DISASSEMBLYM55RFAJ1. REMOVAL OF CLIPS
Remove the clips with a screwdriver covered with a shoptowel to prevent damage to case surfaces.
11. REMOVAL OF EXPANSION VALVE
Loosen the flare nut by using two wrenches (for both theinlet and outlet).

HEATERS AND MANUAL AIR CONDITIONER - Compressor55-27
COMPRESSOR
M55SA- -
/REMOVAL AND INSTALLATION
iJ
iPre-removal Operation
l Discharge of the Refrigerant(Refer to P.55-14.)9.0 Nm
7.Oft.lbs.
\Post-installation Operation
l Adjustment of the Compressor
Drive Belt (Refer to GROUP 11 -Service Adjustment Procedures.)l Charging of Refrigerant(Refer to P.55-11.)21 Nm
15 ftlbs.Removal steps
a*1. Compressor drive belt
2. Condenser fan motor assembly
4*3. Connection of suction hose and discharge
41) l +4. !%znator (Refer to GROUP l6-Alternator.)*I) l * 5. Compressor
6. Idler pulley
7. Compressor bracket
!I zorr-rion pulley assembly;
;: Fontsion pulley
12. Adjustment plate
13. Tension pulley bracket6
45 Nm
33 ft.lbs.
52ONOO89Compressor oil:
Freol S-83 or Suniso 5GS
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55-28HEATERS AND MANUAL AIR CONDITIONER - Comtxessor
20F0067
SERVICE POINTS OF REMOVALM55SBAE1. REMOVAL OF COMPRESSOR DRIVE BELT
(1) Loosen bolt “A” for holding the tension pulley.
(2) Loosen bolt “B” for adjustment, and remove the
‘J
compressor drive belt.
3.REMOVAL OF SUCTION HOSE AND DISCHARGE HOSE
If the hoses are disconnected, cap the hoses with a blankplug to prevent entry of dust, dirt, and water.
5. REMOVAL OF COMPRESSOR
Caution
Lay the towel on the brake tube to protect them. When
install the compressor, do not damage the brake tubes.
This work must be done carefully so as not to spill the
compressor oil.
INSPECTIONM55SCAEl Checking for heat damage of the tension pulley.
l
Check for excessive play or deflection of the tension pulley.l Check for unusual wear of the tension pulley.
l Check for hardening of the air conditioner belt.
lCheck for unusual wear or abrasion of the air conditioner ,
belt.
\d’
OPERATION CHECK OF THE COMPRESSOR’S MAGNETIC
CLUTCH
(1) Connect terminal @ at the compressor side to the positive
(+) terminal of the battery, and ground the negative (-)terminal of the battery to the compressor.
(2) The condition of the compressor’s magnetic clutch can beconsidered satisfactory if the operation sound (a “click”
sound) of the magnetic clutch can be heard when this
check is made.
SERVICE POINTS OF INSTALLATIONM55SDAF5. INSTALLATION OF COMPRESSOR
If a new compressor is installed, first adjust the amount of
oil according to the procedures described below, and then
install the compressor.(1) Measure the amount (X cc) of oil within the removed
compressor.
(2) Wipe away (from the new compressor) the amount ofoil calculated according to the following formula, and
then install the new compressor.
New compressor oil amount
160 cc (9.8 cu.in.) - X cc= Y cc
NOTE
Y cc indicates the amount of oil in the refrigerant line,l/jthe condenser, the cooling unit, etc.
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HEATERS AND MANUAL AIR CONDITIONER - Compressor
DISASSEMBLY AND REASSEMBLY
55-29
M55SE- -16
152OFOO97
Magnetic clutch disassembly steps
1. Bolts
2. Pulley
l * l *3. Nutl *4. Armature plate
gI i;yirring
l *7. Snap ringF* 8. Clutch coil9. ShimsControl valve disassembly
13. Snap ring14. Control valveThermostat and revolution pick up sensor disassem-
bly steps
15. Plate16. Thermostat and revolution pick up sensorHigh pressure relief valve disassembly steps
10. Cover11. Dust cover
12. High pressure relief valveTSB Revision

HEATERS AND MANUAL AIR CONDITIONER - Compressor
Spring
Valve
ompressor
2OPO286~
SERVICE POINT OF DISASSEMBLYMSlSFAE3. REMOVAL OF NUT
Use the special tool to loosen the nut,
INSPECTIONM55SGABl Check the surface of the armature for scoring or bluing.
l Check the surface of the rotor for scoring or bluing.
l Check the sealing surfaces for cracks, scratches and
deformation.
0Check the front housing for cracks or scoring on the sealing
surfaces.l Check the compressor shaft for scoring.
J
HIGH PRESSURE RELIEF VALVE CHECK
The high pressure relief valve is a safety feature which releasesI
part of the refrigerant inside the system into the atmospherewhen the high pressure level exceeds 3,550
kPa (505 psi)
during air conditioner operation.Once the pressure inside the system has been reduced to
2,400
kPa (341 psi) or lower, the high pressure relief valveL&Jcloses, thus allowing continued operation.
(1) If a leak is detected at section A, replace the high pressure
relief valve. The valve can be used unless there is a leak(from that section.
(2) If a leak is detected at section B, retighten the valve. If the
leak still persists after retightening the valve, replace the
packing.
THERMOSTAT CHECK
(1) Dip the thermostat in engine oil.
(2) Check for continuity across terminals @ and @ when theengine oil is heated.
Standard value:Continuity at approx.
110°C (230°F) or less
at A pointNo continuity at approx. 155°C (311°F) or more
,I
at B pointII;TSB Revision