MITSUBISHI 3000GT 1991 Service Manual

HEATERS AND MANUAL AIR CONDITIONER - Heater cmrol *=mW55-19
20A040fINSPECTION
BLOWER SWITCH
M55GCAIOperate the switch, and check the continuity between the
terminals.
NOTEo-0 indicates that there is continuity between the terminals.
SERVICE POINTS OF INSTALLATIONM55GDAQ
10. INSTALLATION OF TEMPERATURE CONTROL WIREConnect the temperature control wire to the blend air
damper lever by following the steps below.
(1) Move the temperature control lever to the rightmost
position. (“HOT” position)
(2) With the blend air damper lever pressed completely
downward in the direction indicated by the arrow,
connect the inner cable of the temperature control wireto the end of the blend air damper lever, and then
secure the outer cable by using a clip.
9.INSTALLATION OF MODE SELECTION CONTROL WIREConnect the mode selection control wire to the mode
selection damper lever by following the steps below.
(1) Move the mode selection lever to the
$$ position.
(2) With the mode selection damper lever pressed inwardin the direction indicated by the arrow, connect the
inner cable of the mode selection control wire to the
end of the mode selection lever, and then secure the
outer cable by using a clip.
3.INSTALLATION OF AIR SELECTION CONTROL WIREConnect 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 &ZI 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 by
using a clip.TSB Revision

55-20 HEATERS AND MANUAL AIR CONDlTlONER - Resistor, Belt Lock Controller
RESISTOR, BELT LOCK CONTROLLERM55JA- -
REMOVAL AND INSTALLATION
viRemoval steps
1. Stoooer
2OFOO732. Globk box outer case assembly
3. Resistor
4. Under cover
5. Belt lock controller
- 2OPOOl
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INSPECTION
RESISTOR CHECK
hl55JCADUsing a circuit tester, measure the resistance between the
terminals indicated below.
The condition can be considered satisfactory if the value
measured at this time is equivalent to the standard value.
Standard value
Terminals measuredStandard value fi
Between terminals a-- @Approx. 1.79 - 2.06
Between terminals
@ -@Approx. 1 .I 0 - 1.26
Between terminals @ - @Approx. 0.38 - 0.44vision

HEATERS AND MANUAL AIR CONDITIONER - Air Condikner Switch55-21
AIR CONDITIONER SWITCH
L
REMOVAL AND INSTALLATIONRemoval steps
1. Center air outlet assembly
2. Air conditioner switch
II/J2OFOO95
M55QA- *
1
I I\L!Y,“~ s/
//
L/
l-----L-I
SERVICE POINTS OF REMOVALM55QBAH1. REMOVAL OF CENTER AIR OUTLET ASSEMBLY
Disengaging the clips (2 positions) of the center air outlet
assembly with a flat tip screwdriver, remove the center airoutlet assembly with the trim stick.
2. REMOVAL OF AIR CONDITIONER SWITCH
Remove the center air outlet assembly, and insert hand tothe back of the cluster panel assembly through the
produced opening. Push it toward you for removal.
INSPECTION
AIR CONDITIONER SWITCH CHECKM55QCAD
OFF.
0
light
If pressed 1 step (ECONOMY)
If pressed 2 steps(Air conditioner)
NOTE(1) The O-O symbol indicates continuity(2) *: 20A018ITSB Revision

55-22HEATERS AND MANUAL AIR CONDITIONER - Heater Unit
HEATER UNIT
REMOVAL AND INSTALLATION
M551A-
Pre-removal and Post-installation Operationl Draining and Supplying of the Coolant(Refer to GROUP 11 -Service AdjustmentProcedures.)l Removal and Installation of the Floor
Console and Instrument Panel
(Refer to GROUP
52A- Floor Console and
Instrument Panel.)Removal steps
-6 dx23. 2. 1.Connection Center Under cover reinforcement of water hoses
4. Distribution duct (foot)
5. Foot shower duct
6. Lap cooler duct
7. Evaporator
mounting bolt and nut -
8. Center duct
9. Heater unit
10. Plate11. Heater core
2OFO104
Nith air
SERVICE POINT OF REMOVALM551BAS7. REMOVAL OF EVAPORATOR MOUNTING BOLT

NOTEIn order to prevent bolts from falling into the blower
assembly, set the inside/outside air-selection damper to theposition that permits outside air introduction.
INSPECTIONM55lCAJ
l Check the operation of dampers and link mechanism.
l Check the heater core for clogging and water leakage.
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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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