heater MITSUBISHI 3000GT 1991 User Guide

cEXTERIOR
- Door Mirror
51-39
witpout heater>18FO167
18FO22(!IINSPECTION
DOOR MIRROR
(1) Check to be sure that the mirror moves as described in the
table when each terminal is connected to the battery.
(2) Check to see that there is continuity between terminals 1
and 5.
RIGHT00
LEFT00
00
NOTE(I)
(2)O-O indicates that each terminal is connected to the battery* indicates door mirror terminal on vehicles without heater.
ELECTRIC REMOTE CONTROL MIRROR SWITCH
Operate switches and check for continuity between terminals.
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INTERIOR - Instrument Panel52A-9
REMOVAL AND INSTALLATION
Pre-removal and Post-installation Operationl Removal and Installation of Floor Console
(Refer to P.52A-11.)
19FO131Removal steps
1. Hood lock release handle
2. Rheostat
3. Switch garnish B
4. Knee protector assembly
5. Column cover
6. Glove box striker
7. Glove box and cross pipe cover
8. Center air outlet assembly
9. Heater control assembly installation screws
10. Meter bezel
i*11. Combination meter
12. Speedometer cable adapter (Mechanical
type speedometer)
13. Speaker or plug
14. Harness connector
15. Steering shaft mounting bolts
16. Instrument panel assembly
Front ofSERVICE POINTS OF REMOVAL
5. REMOVAL OF COLUMN COVER
Remove the screws and remove the column cover while
using care not to break the claws.TSB Revision

52A-10
INTERIOR - Instrument Panel
8. REMOVAL OF CENTER AIR OUTLET ASSEMBLY
Disengaging the clips of the center air outlet assembly with
a flat tip
(-1 screwdriver, remove the center air outlet
assembly with the trim stick.
IIscrewdriver/ 2OFOO321
12. REMOVAL OF SPEEDOMETER CABLE ADAPTER
(MECHANICAL TYPE SPEEDOMETER)
(1) Disconnect the speedometer cable at the transaxle end
of the cable.
(2) Remove the adapter locks from the instrument panel.
(3) Pull the speedometer cable slightly toward the passen-
ger compartment and remove the adapter.
DISASSEMBLY AND REASSEMBLY
QGlove box disassembly steps
1. Glove box stopper
2. Cross pipe cover3. Glove box cover
- w2
4. Ratchet assembly
5. Lock cylinder assembly
6. Glove box
Instrument panel disassembly steps
7. Glove box lower frame
Side air outlet
Photo sensor
Defroster garnish
Heater ducts1(Refer to GROUP
55 -Ventilators.)
Combination gauge (Refer to GROUP 54
-
Meters and Gauges.)8. Instrument panel wiring harness
19FO132
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55-1
HEATER, AIR
CONDITIONER
AND VENTILATION
CONTENTSM55AA- -
HEATERS AND AIR CONDITIONING................3HEATER UNIT*........................................................................22
SPECIFICATIONS
....................................................................3REFRIGERANT LINE................................................................35General Specifications
........................................................3RESISTOR................................................................................20Lubricants
............................................................................4SAFETY PRECAUTIONS........................................................9Sealant and Adhesive............................................................4
Service Specifications3SERVICE ADJUSTMENT PROCEDURES............................10........................................................
SPECIAL TOOLS4Charging Procedures............................................................11
i
........................................................................Charging the Refrigerant....................................................12Compressor Drive Belt Adjustment....................................11
HEATERS AND MANUAL AIR CONDITIONER5Compressor Noise................................................................16
................................................16
AIR CONDITIONER SWITCH................................................21Handling Tubing andFittings
Idle-up Operation Check....................................................17
BELT LOCK CONTROLLER20Performance Test................................................................15....................................................
BLOWER ASSEMBLYPower Relay Check............................................................17............................................................23Refrigerant Leak Repair Procedure....................................15COMPRESSOR........................................................................
27TestProcedures....................................................................10
CONDENSER AND CONDENSER FAN MOTOR................33TROUBLESHOOTING............................................................5
ENGINE COOLANT TEMPERATURE SWITCH....................
39VENTILATORS (AIR INLET AND AIR OUTLET)................38
EVAPORATOR
........................................................................
25VENTILATORS (INSTRUMENT PANEL)*............................36
HEATER CONTROL ASSEMBLY*
........................................18CONTINUED ON NEXT PAGE
SUPPLEMENTAL RESTRAINT SYSTEM (SRS)
(1)A Supplemental Restraint System (SRS), which uses a driver-side air bag, has been installed in the 3000GT.(2)The SRS includes the following components: impact sensors, SRS diagnosis unit: SRS warning light, air bagmodule, clock spring, interconnecting wiring. Other SRS-related components (that may have to be
removed/installed in connection with SRS service or maintenance) are indicated in the table of contents byan asterisk (*).
WARNING!(1)Improper service or maintenance of any component of the SRS, or any SRS-related component, can lead to
personal injury or death to service personnel (from inadvertent firing of the air bag) or to the driver (fromrendering the
SRS inoperative).(2) Service or maintenance of any SRS component or SRS-related component must be performed only at anauthorized MITSUBISHI dealer.
(3) MITSUBISHI dealer personnel must thoroughly review this manual, and especially its GROUP 52B
-Supplemental Restraint System (SRS), before beginning any service or maintenance of any component of theSRS or any SRS-related component.

HEATER, AIR CONDITIONER AND VENTILATION - Specifications55-3
HEATER, AIR CONDITIONER AND VENTILATION
LSPECIFICATIONSM55CA. -
/’
L;
GENERAL SPECIFICATIONS
Items
Heater unit
Type
Heater control assembly
Compressor
Model
Refrigerant unit lubricant
cc (cu.in.1
V belt sizemm (in.)
Dual pressure switch
High pressure switch
kPa (psi)
Low pressure switchkPa (psi)
Freezer prevention
“C (“F)
Refrigerant and quantityg (oz.)
Specifications
Three-way-flow full-air-mix system
Dial type
Scroll type (FX-105 VS)
FREOL S-83 or SUNISO 5GS160 & 20 (9.8 + 1.2)
1,150 (45.3)
OFF: 2,700 (384)ON: 2,100 (299)
OFF: 210 (30)
ON
: 235 (33)
Air temperature thermostatOFF: - 2 (28.4)
ON: 2 (35.6)
R-l 2Approx. 970 (34)
SERVICE SPECIFICATIONSM55CB. -
Items
Standard value
Idle speed when air conditioner onrpm
Resister resistance value1R
Refrigerant temperature sensor
Sensor-ON temperature
“C (“F)
Sensor-OFF temperature“C (“F)
Revolution pick up sensor standard resistance 0
Clutch clearancemm (in.)
Engine coolant temperature switch
Switch-OFF temperature
“C (“F)

Air mix damper potentiometer motor assembly resistanceMAX. HOT
kQMAX. COOL
kS1
Outlet selector damper potentiometer assembly resistanceDEF. position
kS1FACE position
kfl
Water temperature sensor
Sensor-ON temperature
“C (“F)
Specifications
900
f 100 CA/T at P range>
1.76
- 2.06 (Across terminals @and 0)
1 .I 0 - 1.26 (Across terminals @and 0)
0.38 - 0.44 (Across terminals @and @)
Approx. 110 (230) or less
Approx. 155 (311) or more
405
f 35 when ambient temperature is 20°C (68°F)
0.4 - 0.6 (.Ol - .02)
112-118(233-244)
0.2
4.9
2.0
4.3
26.5 f 4 (79.7 + 7)
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55-4 HEATER, AIR CONDITIONER AND VENTILATION -Specifications / Special Tools
LUBRICANTSM55CD. _
ItemsSpecified lubricants
Each connection of refrigerant lineFREOL S-83 or
SUNISO 5GS
Quantity
As required
SEALANT AND ADHESIVEM55CE- -
IItemsSpecified sealant and adhesiveI
Engine coolant temperature switch threaded part3M Nut Locking Part No. 4171 or equivalent
SPECIAL TOOLSMSSDA- -
multi-use tester)
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HEATERS AND MANUAL AIR CONDITIONER - Troubleshooting55-5
HEATERS AND MANUAL AIR CONDITIONER
t+-/ TROUBLESHOOTING
L
M55ECAE
Symptom
Heater insufficientheatProbable cause
Obstructed heater outlets
Blend air dampers improperly adjusted or binding
Thermostat malfunction
Obstructed heater hoses
Remedy
Correct
Replace
No ventilation evenwhen mode selectionknob is operatedImproperly adjusted control cables
Plugged or partially plugged heater core
Incorrect adjustment of mode selection dampersIncorrect installation of mode selection controlwire
Ducts are incorrectly/incompletely connected,crushed, bent or clogged
Burnt-out fuse
Poor grounding
Malfunction blower switch
Malfunction resistorAdjust
Clean or replace
Adjust
Blower motor
inoperative
Repair or replace
ReplaceCorrect
Replace
Malfunction blower motor
Malfunction heater relay
Malfunction blower motor relay
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55-6HEATERS AND MANUAL AIR CONDITIONER - Troubleshooting
CIRCUIT DAIGRAM
P\IR CONDITIONER CONTROL UNIT CIRCUIT
1 Batte
( Alternator k
2-Jl-
-use
Fuse
-yq
L-l
Fuse
vi ~~o~~;motor ;?IResistor;
r---HI---MH:---ML---I n
IIHeater control panelI-
fI.IAir conditioner switch
1
Air conditioner control unit
A/CI
Regulator
IT
If
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1II
1 IFin therm0 sensorAir inlet sensor
I” ”I\
Revolution pick up sensori
Compressor
@IDY
vi;
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2OFOO43
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2OFOO85HEATERS AND MANUAL AIR CONDITIONER
- Trqubleshooting55-7
TROUBLESHOOTING HINTSInspection of Air Conditioner Control Unit
Disconnect the amplifier and inspect the connector on the wire
harness side as shown in the chart below.
Test Conditions:
(1) Ignition switch: ON
(2) Air conditioner switch: ON
(3) Temperature control lever: MAX. COOL
(4) Blower switch: HI
1 Terrrnal 1Signal
Conditions
8Auto compressor control unit groundAt all timesov
1Auto compressor control unit power
SUPPlY
When ignition switch is ON
Battery
voltage
6Air conditioner compressor relay
When all conditions for switch-ON of
Battery
the compressor are satisfiedvoltage
I ’I
Air conditioner switch: A/C
When air conditioner switch pressed inBattery
to second stepvoltage
Air conditioner switch: ECONO
When air conditioner switch pressed in
to first step
13Fin-therm0 sensor 0Ignition switch, blower switch and airApprox.
conditioner switch: ON2.5V/
LJ14Air-inlet sensor 0Ignition switch, blower switch and air
conditioner switch: ONApprox.IV
15Fin-therm0 sensor 0Ignition switch, blower switch and air
conditioner switch: ON
Ambient temperature: 4°C (39°F)
OV
18Air-inlet sensor 0Ignition switch, blower switch and air
conditioner switch: ON
Ambient temperature: 4°C (39°F)ov
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55-8HEATERS AND MANUAL AIR CONDITIONER - Troubleshooting
TROUBLESHOOTING QUICK-REFERENCE TABLE
Compressor doesn’t operate.
hen
no.
4
5
6
7
8
9
-
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switch terminals.
Sensor
”
1
InspectronCriteriapointIMethodProbable causeIRemedy
Abnormal
No sound is
notedFaulty magnetic clutchReplace magnetic clutch.
No continuity
Faulty blower switchReplace blower switch
No continuity
Faulty air conditioner
switchReplace air conditioner
switch.
No continuity
Faulty air magnetic clutch
relayReplace magnetic clutch
relay.
pa;?’ places where gas
II
Vo continuityFaulty dual-pressure switchReplace dual-pressure
\Jo continuityIFaulty thermostatswitch.Replace thermostat.
Outside range of3.9 to 4.1 kfiFaulty fin-therm0 sensorReplace fin-therm0 sensor
3utside range ofFaulty air inlet sensor1.9tol.l kQReplace air inlet sensor.
If no abnormality
is noted at each inspection point after inspection coducted in the sequence shown in this quick-reference table, it is suspected that
the compressor IS Inoperative because of faulty air conditioner control unit. Therefore, replace the air conditioner control unit.
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