Ac Heater System Automatic

8/14/2019 Ac Heater System Automatic

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A/C-HEATER SYSTEM - AUTOMATIC

1993 Mitsubishi Diamante

1993 AIR CONDITIONING & HEATMitsubishi Motors - Automatic A/C-Heater System

Diamante

* PLEASE READ THIS FIRST *

WARNING: To avoid injury from accidental air bag deployment, read andcarefully follow all SERVICE PRECAUTIONS and DISABLING &ACTIVATING AIR BAG SYSTEM procedures inAIR BAG RESTRAINT SYSTEM article.

A/C SPECIFICATIONS

A/C SPECIFICATIONS TABLE

Application Specification

Compressor TypeSedanR-12 ............................ Sanden FX105VS ScrollR-134a .................................. Sanden MSC105Wagon ...................... Nippondenso 10PA17C 10-Cyl.

Compressor Belt DeflectionDOHC EngineNew ........................... 9/64-5/32" (3.5-4.0 mm)Used ......................... 5/32-13/64" (4.0-5.0 mm)SOHC EngineNew .......................... 17/64-9/32" (6.5-7.0 mm)

Used ......................... 9/32-11/32" (7.0-8.5 mm)System Oil Capacity

SedanR-12 ..................................... 5.4-6.0 ozs.R-134a ............................... (1) 5.7-6.4 ozs.Wagon (R-12) .................................. 5.4 ozs.

Refrigerant CapacitySedanR-12 ....................................... 34-38 ozs.R-134a ..................................... 26-28 ozs.Wagon .......................................... 28 ozs.

System Operating Pressures (2)SedanHigh Side ................ 105-112 psi (7.4-7.9 kg/cm

)Low Side ................... 19-28 psi (1.3-2.0 kg/cm

)

WagonHigh Side .............. 206-213 psi (14.5-15.0 kg/cm

)Low Side ................... 21-28 psi (1.5-2.0 kg/cm

)

(1) - Use SUN PAG 58 refrigerant oil.(2) - Specification is with ambient temperature at about

80

F (26.7

C).

A/C SYSTEM PERFORMANCE

1) Park vehicle out of direct sunlight. Connect manifoldgauge set. Start engine and allow it to idle at 1000 RPM. Set A/Ccontrols to recirculate air, panel (vent) mode, full cold, and A/Cbutton on.


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2) Set blower/fan on high speed and close doors and windows.Insert thermometer in center vent. Operate system for 20 minutes toallow system to stabilize. Measure temperature. Temperature must be37-42

F (3-6

C) at center vent, with high side and low side pressureswithin specification. See A/C SPECIFICATIONS table at beginning ofarticle.

A/C CONTROL UNIT CIRCUIT

SedanCheck voltage between ground and indicated A/C control unit

terminals. See Fig. 1. See A/C CONTROL UNIT CIRCUIT TEST (SEDAN)table.

A/C CONTROL UNIT CIRCUIT TEST (SEDAN) TABLE

Terminal No. Test(Component/Circuit) Condition Volts

3 (Back-Up Power) ........ At All Times .............. 1235 (Ground) .............. At All Times ............... 036 (Power Source) ......... Ignition On .............. 12

WagonCheck voltage between ground and indicated A/C control unit

terminals. See Fig. 2. See A/C CONTROL UNIT CIRCUIT TEST (WAGON)table.

A/C CONTROL UNIT CIRCUIT TEST (WAGON) TABLE


1 (Power Source) .......... Ignition On ............. 1211 (Ground) ............... Ignition On .............. 0

POTENTIOMETER CIRCUIT


terminals. See Fig. 1. See POTENTIOMETER CIRCUIT TEST (SEDAN) table.

POTENTIOMETER CIRCUIT TEST (SEDAN) TABLE


6 (Air Mix Damper) .... Max. Cool Position ..... 0.1-0.330 (Air Mix Damper) ... Max. Hot Position ...... 4.7-5.07 (Outlet Selector Damper) Face Position ........ 0.1-0.522 (Outlet SelectorDamper) .............. Defrost Position ...... 4.7-5.0

8 (Damper Ground) ........ At All Times .............. 010 (Power Source) ........ At All Times ........ 4.8-5.2


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Fig. 1: Identifying A/C Control Unit Terminals (Sedan)Courtesy of Mitsubishi Motor Sales of America


terminals. See Fig. 2. See POTENTIOMETER CIRCUIT TEST (WAGON) table.

POTENTIOMETER CIRCUIT TEST (WAGON) TABLE


10 (Power Source) ......... Ignition On ........ 4.8-5.212 (Damper Ground) ........ Ignition On .............. 013 (Outlet Selector Damper) Face Position ....... 3.8-4.222 (Outlet SelectorDamper) .............. Defrost Position ...... 0.9-1.1

14 (Air Mix Damper) ... Max. Cool Position ..... 0.9-1.130 (Air Mix Damper) ... Max. Hot Position ...... 3.8-4.2

Fig. 2: Identifying A/C Control Unit Terminals (Wagon)Courtesy of Mitsubishi Motor Sales of America

IN-CAR TEMPERATURE SENSOR, OUTSIDE AIR TEMPERATURE SENSOR &AIR (FIN) THERMOSENSOR CIRCUIT


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terminals. See Fig. 1. See IN-CAR TEMPERATURE SENSOR, OUTSIDE AIRTEMPERATURE SENSOR & AIR (FIN) THERMOSENSOR CIRCUIT TEST table.

IN-CAR TEMPERATURE SENSOR, OUTSIDE AIR TEMPERATURE SENSOR &AIR (FIN) THERMOSENSOR CIRCUIT TEST TABLE


5 (Outside Air Temp.Sensor) .............. (1) 77

C (25

C) ....... 2.3-2.610 (Sensor Power Source) . At All Times ........ 4.8-5.216 (In-Car Temp. Sensor) (1) 77

C (25

C) ....... 2.5-2.717 (Air/Fin Thermosensor) (1,2) 77

C (25

C) ..... 2.5-2.7

(1) - Sensor resistance should be 4000 ohms.(2) - Measured with A/C system off.

COOLANT TEMPERATURE & PHOTO SENSOR CIRCUIT


terminals. See Fig. 1. SeeCOOLANT TEMPERATURE SENSOR & PHOTO SENSOR CIRCUIT TEST (SEDAN) table.

COOLANT TEMPERATURE SENSOR & PHOTO SENSOR CIRCUIT TEST (SEDAN)TABLE

Terminal No. Test

(Component/Circuit) Condition Volts

9 (Coolant Temp. Sensor) .. (1) Ignition Off .......... 1.217 (Coolant Temp. Sensor) .. (2) Ignition On ........... 019 (Photo Sensor -) ...... At All Times ................ 020 (Photo Sensor +) .. (3) In Lighted Area .. -0.1 To -0.223 (Photo Sensor +) .. (4) In Dark Area ................ 0

(1) - With coolant temperature less than 122

F (50

C).(2) - With coolant temperature greater than 122

F (50

C).(3) - Brightness at 100,000 lux or more.(4) - Brightness less than zero lux.

Wagon

Check voltage between ground and indicated A/C control unitterminals. See Fig. 2. See PHOTO SENSOR CIRCUIT TEST (WAGON) table.

PHOTO SENSOR CIRCUIT TEST (WAGON) TABLE


10 (Photo Sensor +) ....... Ignition On ........ 4.8-5.216 (Photo Sensor -) ... (1) In Lighted Area ... 0.06-2.0

(2) In Dark Area .......... 0.06

(1) - Brightness at 100,000 lux or more.(2) - Brightness less than zero lux.


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AIR MIX DAMPER, OUTLET SELECTOR DAMPER & INSIDE/OUTSIDE AIR

SELECTOR DAMPER DRIVE MOTOR CIRCUIT


terminals. See Fig. 1. See INSIDE/OUTSIDE AIR SELECTOR DAMPER, AIR MIXDAMPER & OUTLET SELECTOR DAMPER DRIVE MOTOR CIRCUIT TEST (SEDAN)table.

INSIDE/OUTSIDE AIR SELECTOR DAMPER, AIR MIX DAMPER &OUTLET SELECTOR DAMPER DRIVE MOTOR CIRCUIT TEST (SEDAN)


23 (Outlet SelectorMotor -) ............ (1) Face Position .......... 0.5

24 (Outlet SelectorMotor -) ........... (2) Defrost Position ...... 10-12

25 (Air Mix Motor +) .... (3) 63

F (17

C) .......... 0.525 (Air Mix Motor +) ... (4) 90.5

F (32.5

C) ..... 10-1231 (Air Mix Motor -) .... (3) 63

F (17

C) ........ 10-1231 (Air Mix Motor -) ..... (4) 90.5

F (32.5

C) ..... 0.532 (Out SelectorMotor +) ............. (1) Face Position ....... 10-12

32 (Out SelectorMotor +) ............ (2) Defrost Position ....... 0.5

(1) - Output turns off 40 seconds after damper moves to faceposition.

(2) - Output turns off 40 seconds after damper moves todefrost position.

(3) - With temperature set as specified, output turns off 40seconds after damper moves to maximum cool position.

(4) - With temperature set as specified, output turns off 40seconds after damper moves to maximum hot position.


terminals. See Fig. 2. SeeAIR MIX DAMPER & DAMPER DRIVE MOTOR CIRCUIT TEST (WAGON) table.

AIR MIX DAMPER & DAMPER DRIVE MOTOR CIRCUIT TEST (WAGON)TABLE

Terminal No. Test

(Component/Circuit) Condition Volts

25 (Air Mix Motor +) ..... (3) Max. Cool ......... 0-1.0(Air Mix Motor +) ........ (4) Max. Hot .......... 10-1226 (Outlet SelectorMotor -) ............. (1) Face Position ........ 10-1224 (Outlet SelectorMotor -) ............ (2) Defrost Position ...... 1-1.031 (Air Mix Motor -) ..... (3) Max. Cool ......... 10-12(Air Mix Motor -) ........ (4) Max. Hot .......... 0-1.032 (Out SelectorMotor +) ............. (1) Face Position ........ 10-1232 (Out SelectorMotor +) ............ (2) Defrost Position ...... 0-1.0


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(1) - Output turns off 40 seconds after damper moves to faceposition.

(2) - Output turns off 40 seconds after damper moves todefrost position.

(3) - With temperature set as specified, output turns off 40seconds after damper moves to maximum cool position.

(4) - With temperature set as specified, output turns off 40seconds after damper moves to maximum hot position.

AIR INLET SENSOR, AIR/FIN THERMOSENSOR, IN-CAR TEMPERATURESENSOR, & WATER TEMPERATURE SENSOR CIRCUIT


terminals. See Fig. 2. See AIR INLET SENSOR, AIR (FIN) THERMOSENSOR,IN-CAR TEMPERATURE SENSOR, & WATER TEMPERATURE SENSOR CIRCUIT TEST(WAGON) table.

AIR INLET SENSOR, AIR/FIN THERMOSENSOR, IN-CAR TEMPERATURESENSOR & WATER TEMPERATURE SENSOR CIRCUIT TEST TABLE (WAGON)


3 (Water Temp. Sensor) ... 77

F (25

C) ......... 2.7-3.04 (Air/Fin Thermosensor) (1) 77

F (25

C) ........ 2.6-3.15 (Air Inlet Sensor) ...... 77

F (25

C) ........ 2.6-3.16 (In-Car Temp. Sensor) .. 77

F (25

C) ......... 2.7-3.112 (Sensor Ground) ........ Ignition On .............. 0

(1) - Measured with A/C system off.

POWER TRANSISTOR & BLOWER MOTOR HI RELAY CIRCUIT


terminals. See Fig. 1. SeePOWER TRANSISTOR & BLOWER MOTOR HI RELAY CIRCUIT TEST (SEDAN) table.

POWER TRANSISTOR & BLOWER MOTOR HI RELAY CIRCUIT TEST (SEDAN)TABLE

Terminal No. Blower Sw.(Component/Circuit) Position Volts

1 (Power Transistor Collector) .... OFF ................ 12

1 (Power Transistor Collector) ..... LO ......... Approx. 71 (Power Transistor Collector) ..... HI ................. 02 (Power Transistor Base) ......... OFF ................. 02 (Power Transistor Base) .......... LO ....... Approx. 1.32 (Power Transistor Base) .......... HI ....... Approx. 1.221 (Blower Motor HI Relay) ......... HI ............. 0-1.54 (Blower HI Relay) ............... MED ................ 124 (Blower HI Relay) ................ LO ................ 124 (Blower HI Relay) ............... OFF ................ 12


terminals. See Fig. 2. SeePOWER TRANSISTOR & BLOWER MOTOR HI RELAY CIRCUIT TEST (WAGON) table.


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POWER TRANSISTOR & BLOWER MOTOR HI RELAY CIRCUIT TEST (WAGON)TABLE

Terminal No. Blower Sw.(Component/Circuit) Position Volts

52 (Blower Motor Hi Relay) .... HI ................ 1.5 Or Less4 (Blower HI Relay) ........... MED ........................ 124 (Blower HI Relay) ........... LO ......................... 124 (Blower HI Relay) ........... OFF ........................ 1258 (Power Transistor Collector) OFF ........................ 121 (Power Transistor Collector) LO .................. Approx. 91 (Power Transistor Collector) HI .......................... 066 (Power Transistor Base) .... OFF ......................... 0

DUAL-PRESSURE SWITCH

1) Turn engine off. Disconnect harness connector at dual-pressure switch (located near condenser). Jumper harness connector.Turn A/C switch and blower switch to ON position. Momentarily turnignition on and listen for compressor clutch engagement.

2) If compressor clutch does not engage, check evaporatorthermistor and engine coolant temperature switch. Check for a faultyfuse. Repair or replace components as necessary. If compressor clutchengages, go to next step.

3) Connect manifold gauge set to system, and check operatingpressures. On Sedan, dual-pressure switch should allow compressoroperation if system pressure is 30-384 psi (2-27 kg/cm

). On Wagon,dual-pressure switch should allow compressor operation if systempressure is 30-225 psi (2-22 kg/cm

).4) On both models, if dual-pressure switch does not operate

within specified pressure range, discharge system using approvedrefrigerant recovery/recycling equipment. Replace dual-pressureswitch.

IN-CAR TEMPERATURE SENSOR

In-car temperature sensor is located on headliner. Connectohmmeter to in-car temperature sensor terminals. Measure resistancevalue of sensor at 77

F (25

C). Resistance should be about 4000 ohms(Sedan) or 15,000 ohms (Wagon). Replace sensor if resistance is not asspecified.

OUTSIDE TEMPERATURE SENSOR

Sedan

Outside temperature sensor is located on top of blower motorassembly. Connect ohmmeter to outside temperature sensor terminals.Measure resistance value of sensor at 77

F (25

C). Resistance shouldbe about 4000 ohms. Replace sensor if resistance is not as specified.

COOLANT TEMPERATURE SENSOR

1) Coolant temperature sensor is located on top left side ofevaporator assembly. See Fig. 24. Disconnect coolant temperaturesensor connector.

2) Connect ohmmeter to coolant temperature sensor terminals.Check sensor continuity with coolant temperature at 73-87

F (23-31

C).Continuity should be present. If continuity does not exist, replacecoolant temperature sensor.


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AIR/FIN THERMOSENSOR

1) Air/fin thermosensor is located on left side of evaporatorassembly. Connect ohmmeter to air/fin thermosensor terminals.

2) Measure resistance with sensors sensing temperature at77

F (25

C). Resistance should be about 4000 ohms (Sedan) or 15,000ohms (Wagon). Replace air/fin thermosensor if resistance largelydeviates from specified resistance.

INSIDE/OUTSIDE AIR DAMPER MOTOR

Sedan1) Ensure damper is not in recirculated air or fresh air

position. Disconnect inside/outside air damper motor connector. SeeFigs. 3 and 4. Apply battery voltage and ground to motor connectorterminals No. 1 and 2. Motor should operate when battery voltage isapplied. Check wiring or replace defective motor if it does notoperate.

2) Reverse battery polarity on motor connector terminals.Motor should operate in opposite direction. DO NOT continue applyingbattery voltage if motor does not operate. Check wiring or replacedefective motor if it does not operate.

Wagon1) Ensure damper is not in recirculated air or fresh air

position. Disconnect inside/outside air damper motor connector. SeeFig. 4. Apply battery voltage to motor connector terminal No. 1 andground terminal No. 2. Motor should operate when battery voltage isapplied. DO NOT continue applying battery voltage if motor does notoperate. Check wiring or replace defective motor if it does notoperate.

2) Apply battery voltage to motor connector terminal No. 1

and ground terminal 4. Motor should operate when battery voltage isapplied. DO NOT continue applying battery voltage if motor does notoperate. Check wiring or replace defective motor if it does notoperate.

Fig. 3: Identifying Inside/Outside Air Damper Motor (Sedan)Courtesy of Mitsubishi Motor Sales of America


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Fig. 4: Identifying Inside/Outside Air Damper Motor (Wagon)Courtesy of Mitsubishi Motor Sales of America

AIR MIX DAMPER MOTOR

1) Ensure damper is not in maximum hot or maximum coolposition. Disconnect air mix damper motor connector. See Fig. 5. Apply

battery voltage and ground to motor connector terminals No. 2 and 6(Sedan) or terminals No. 1 and 3 (Wagon). Motor should operate whenbattery voltage is applied.

2) Reverse battery polarity on motor connector terminals.Motor should operate in opposite direction. DO NOT continue applyingbattery voltage if motor does not operate. Check wiring or replacedefective motor if it does not operate.


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Fig. 5: Identifying Air Mix Damper Motor & Potentiometer ConnectorCourtesy of Mitsubishi Motor Sales of America

AIR MIX DAMPER POTENTIOMETER

1) Connect ohmmeter across air mix damper motor connectorterminals No. 3 and 4 (Sedan) or terminals No. 2 and 5 (Wagon). SeeFig. 4. Resistance should gradually change as damper is moved frommaximum hot to maximum cool position.

2) On Sedan, resistance should be 200 ohms at maximum hotposition and 4900 ohms at maximum cool position. On Wagon, resistanceshould be 4800 ohms at maximum hot position and 1200 ohms at maximumcool position. On both models, replace air mix damper potentiometer ifresistance readings are not as specified.

OUTLET SELECTOR DAMPER MOTOR

1) Ensure damper is not in defrost or face position.Disconnect outlet selector damper motor connector. Apply batteryvoltage and ground to motor connector terminals No. 2 and 6 (Sedan) orterminals No. 1 and 3 (Wagon). See Fig. 6. Motor should operate whenbattery voltage is applied.

2) Reverse battery polarity on motor connector terminals.Motor should operate in opposite direction. DO NOT continue applying

battery voltage if motor does not operate. Check wiring or replacedefective motor if it does not operate.

Fig. 6: Outlet Selector Damper Motor & Potentiometer Connector IDCourtesy of Mitsubishi Motor Sales of America

OUTLET SELECTOR DAMPER POTENTIOMETER


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1) Connect ohmmeter across air mix damper motor connectorterminals No. 3 and 4 (Sedan) or terminals No. 2 and 4 (Wagon). SeeFig. 6. Resistance should gradually change as damper is moved fromdefrost to face position.

2) On Sedan, resistance should be 2000 ohms in defrostposition and 4300 ohms in face position. On Wagon, resistance shouldbe 900 ohms in defrost position and 3600 ohms in face position. Onboth models, replace outlet selector damper potentiometer ifresistance readings are not as specified.

A/C-HEATER RELAYS

1) Disconnect each relay. See Figs. 7-9. Check continuity ofeach relay as follows. Connect negative battery lead to relay terminalNo. 4 and positive lead to terminal No. 2. See Fig. 10. Using anohmmeter, ensure continuity exists between relay terminals No. 1 and3.

2) Disconnect battery. Ensure continuity does not exist

between relay terminals No. 1 and 3. Continuity should exist betweenrelay terminals No. 2 and 4. Replace relay if it does not test asspecified.

Fig. 7: Identifying A/C-Heater RelaysCourtesy of Mitsubishi Motor Sales of America


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Fig. 8: Identifying Blower Motor RelayCourtesy of Mitsubishi Motor Sales of America

Fig. 9: Identifying Blower Motor HI RelayCourtesy of Mitsubishi Motor Sales of America


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Fig. 10: Identifying Relay TerminalsCourtesy of Mitsubishi Motor Sales of America

BLOWER SWITCH

1) Disconnect blower switch connector. With blower switch inAUTO position, continuity should exist between blower switch terminalsNo. 1 and 25 (Sedan) or terminals No. 8 and 63 (Wagon). See Fig. 11.

2) On Sedan, with blower switch in maximum speed position,continuity should exist between blower switch terminals No. 3 and 25.With blower switch in any position (except maximum), continuity shouldexist between blower switch terminals No. 2 and 25.

3) On both models, operate blower switch. Measure resistancebetween blower switch terminals No. 8 and 20 (Sedan) or terminals No.

8 and 63 (Wagon). With blower switch in minimum speed position,resistance should be 250 ohms. With blower switch in maximum speedposition, resistance should be 1800-2200 ohms. Replace blower switchif it does not test as specified.


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Fig. 11: Blower Switch Terminals & Temperature Control Switch

Terminal ID (Sedan)Courtesy of Mitsubishi Motor Sales of America

Fig. 12: Blower Switch Terminals & Temperature Control SwitchTerminal ID (Wagon)Courtesy of Mitsubishi Motor Sales of America

PHOTO SENSOR


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Photo sensor is located on top center of dash. Connectvoltmeter and battery to photo sensor terminals. See Fig. 13. Measurevoltage with photo sensor covered and uncovered. Compare voltagereadings. Voltage should be greater when sensor is not covered.

Fig. 13: Testing Photo Sensor (Sedan)Courtesy of Mitsubishi Motor Sales of America

Fig. 14: Testing Photo Sensor (Wagon)Courtesy of Mitsubishi Motor Sales of America

BLOWER MOTOR


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Disconnect blower motor connector. Connect a 12-volt batteryto blower motor terminals. Blower motor should operate smoothly.Reverse battery leads. Blower motor should operate smoothly in reversedirection. Replace blower motor if it does not function as described.

REFRIGERANT TEMPERATURE SENSOR

SedanSubmerge refrigerant temperature sensor tip in engine oil.

Using an ohmmeter, check continuity between refrigerant sensorterminals No. 1 and 2 (SOHC) or terminals No. 3 and 6 (DOHC). SeeFig. 15. When engine oil is heated to 230

F (110

C), continuity shouldexist. When engine oil is heated to 311

F (155

C), no continuityshould exist.

Fig. 15: Identifying Refrigerant Temperature SensorCourtesy of Mitsubishi Motor Sales of America

REVOLUTION PICK-UP SENSOR

SedanUsing an ohmmeter, measure resistance between revolution

pick-up sensor terminals No. 2 and 5. See Fig. 16. Resistance shouldbe 370-440 ohms at 68

F (20

C). Replace revolution pick-up sensor ifit does not test as specified.


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Fig. 16: Identifying Revolution Pick-Up SensorCourtesy of Mitsubishi Motor Sales of America

CONTROL VALVE

Sedan1) Operate A/C when vehicle interior temperature is high.

Connect a low pressure gauge to A/C compressor. Operate A/C withengine running at idle.

2) Slowly increase engine speed while observing low pressure

gauge. If control valve is operating normally, low-side pressure willdrop slowly as engine speed is increased. When low-side pressurereaches 25 psi (1.75 kg/cm

) for R-12 or 20-30 psi (1.4-2.1 kg/cm

)for R-134a, pressure will level off temporarily and then continue todecrease as engine speed is further increased.

3) If control valve is defective, low pressure will drop indirect proportion to increase in engine speed without temporarilyleveling off at the specified pressure level. Replace control valve ifit does not test as specified.

CONDENSER FAN MOTOR

Voltage CheckApply battery voltage to condenser fan motor terminal No. 3.

Ensure condenser fan motor turns when terminal No. 4 is grounded. See

Fig. 17. Replace condenser fan motor if it does not operate withbattery voltage applied.

Resistance CheckUsing an ohmmeter, check resistance between condenser fan

motor terminals No. 1 and 2. See Fig. 17. Resistance should be 290ohms. Replace condenser fan motor if resistance is not as specified.

Fig. 17: Identifying Condenser Fan Motor TerminalsCourtesy of Mitsubishi Motor Sales of America


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TEMPERATURE CONTROL SWITCH

SedanDisconnect temperature control switch connector. See Figs. 11

and 14. Measure resistance between switch connector terminals No. 4and 20. With switch at maximum cool position, resistance should bezero ohms. With switch at any position other than maximum cool,resistance should be infinite. replace switch if it does not test asspecified.

BELT LOCK CONTROLLER CIRCUIT (DOHC)

Belt lock controller is mounted on side of evaporator case.Check voltage between ground and indicated A/C belt lock control unitterminals. See Fig. 18. See BELT LOCK CONTROLLER CIRCUIT TEST (DOHC)table.

BELT LOCK CONTROLLER CIRCUIT TEST (DOHC) TABLE

Terminal No. Test(Component/Circuit) Condition (1) Volts

1 (Rotation Sensor) ....... A/C ON .. (2) .2 VAC Or More2 (Ground) .............. At All Times ............... 03 (Power Source) ......... Ignition On .............. 125 (A/C Switch Indicator) ... A/C ON ............. .7-.90

Belt Slip ................ 57 (Engine RPM Signal) ..... Engine ON .... (2) 1 Or More9 (Rotation Sensor) ......... A/C ON ........ (2) .2 VAC10 (Ground) .............. At All Times .............. 011 (Power Source) ......... Ignition On ............. 1213 (Compressor) ............. A/C ON ................. 6

A/C OFF .............. 0-.514 (A/C Control Unit) ....... A/C ON ............... 9-12

A/C OFF ................. 015 (Compressor Relay) ....... A/C ON ............. 9.5-12

A/C OFF ................. 0

(1) - All voltages are DC unless indicated otherwise.(2) - Pulse signal voltage (alternating current).

Fig. 18: Identifying A/C Belt Lock Controller Terminals (DOHC)Courtesy of Mitsubishi Motor Sales of America.

REMOVAL & INSTALLATION


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* PLEASE READ THIS FIRST *

WARNING: To avoid injury from accidental air bag deployment, read andcarefully follow all SERVICE PRECAUTIONS and DISABLING &ACTIVATING AIR BAG SYSTEM procedures inAIR BAG RESTRAINT SYSTEM article.

A/C-HEATER CONTROL PANEL

Removal & InstallationRemove ashtray. Remove floor console assembly. Remove audio

panel and heater control garnish. See Fig. 19. Remove A/C-heatercontrol panel. Remove center switch assembly. Remove A/C-heatercontrol panel assembly. To install, reverse removal procedure.

Fig. 19: Exploded View Of A/C-Heater Control Panel AssemblyCourtesy of Mitsubishi Motor Sales of America

A/C CONTROL UNIT


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Removal & InstallationRemove ashtray. Remove floor console assembly. Remove audio

panel and heater control garnish. See Fig. 20. Remove A/C-heatercontrol panel assembly. Remove radio and tape player. Remove A/Ccontrol unit. To install, reverse removal procedure.

Fig. 20: Exploded View Of A/C Control Unit Assembly

Courtesy of Mitsubishi Motor Sales of America

POWER TRANSISTOR & BELT LOCK CONTROLLER

Removal & InstallationRemove glove box. Remove power transistor and/or belt lock

controller (DOHC engines). See Fig. 10. To install, reverse removalprocedure.


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Fig. 21: Identifying Power Transistor & Belt Lock ControllerCourtesy of Mitsubishi Motor Sales of America

AIR MIX DAMPER MOTOR ASSEMBLY

Removal & Installation1) Remove ashtray. Remove floor console assembly. Remove

audio panel. See Fig. 22.2) Remove radio and tape player. Remove heater control

garnish and A/C-heater control panel assembly. Remove Electronic PowerSteering (EPS) control unit. Remove air mix damper motor assembly. Toinstall, reverse removal procedure.

Fig. 22: Identifying A/C ComponentsCourtesy of Mitsubishi Motor Sales of America

INSIDE/OUTSIDE AIR SELECTOR DAMPER MOTOR


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Removal & InstallationRemove glove box. Remove glove box outer case assembly.

Remove inside/outside air selector damper motor assembly. See Fig. 22.To install, reverse removal procedure.

OUTLET SELECTOR DAMPER MOTOR

Removal & InstallationRemove driver-side lower panel. See Fig. 22. Remove foot

shower nozzle and lap cooler duct. Remove center reinforcement. Removeoutlet selector damper motor assembly. To install, reverse removalprocedure.

HEATER CORE

Removal & Installation1) Drain coolant. Disconnect heater hoses. Remove passenger-

side undercover. See Fig. 23. Remove right foot shower duct. Removeinstrument panel. See INSTRUMENT PANEL under REMOVAL & INSTALLATION.

2) Remove foot shower nozzle, lap cooler duct and center ductassembly. Remove left foot shower duct, and front and rear centerreinforcement. Remove center stay assembly and distribution ductassembly.

3) Remove evaporator bolts and nuts. Remove power transistorand coolant temperature sensor. Remove air mix damper motor assembly.Remove heater unit. Remove heater hose plate assembly and heater core.

4) To install, reverse removal procedure. Refill coolingsystem and check cooling system for leaks.

Fig. 23: Exploded View Of Heater Core AssemblyCourtesy of Mitsubishi Motor Sales of America

COOLANT TEMPERATURE SENSOR


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Removal & InstallationRemove glove box. Remove glove box outer case. Remove clip

holding sensor. See Fig. 24. Remove coolant temperature sensor. Toinstall, reverse removal procedure.

Fig. 24: Coolant Temperature Sensor & Outside Temperature Sensor IDCourtesy of Mitsubishi Motor Sales of America

BLOWER ASSEMBLY & BLOWER CASE

Removal & Installation1) Remove glove box. Remove glove box outer case. Remove

passenger-side undercover. Remove foot shower duct. See Fig. 25.Remove glove box frame. Remove evaporator bolts and nuts.

2) Remove inside/outside air damper motor assembly. RemoveMulti-Point Injection (MPI) control unit relay. Remove MPI controlunit. Remove instrument panel passenger-side lower bracket.

3) Remove blower assembly. Remove blower motor assembly.Remove blower case. To install, reverse removal procedure.


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Fig. 25: Exploded View Of Blower Motor & Blower Case AssembliesCourtesy of Mitsubishi Motor Sales of America

EVAPORATOR


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Removal1) Discharge A/C system using approved refrigerant

recovery/recycling equipment. Remove glove box and glove box outercase. Disconnect and plug suction and discharge hoses.

2) Disconnect evaporator case drain hose. See Fig. 26. Removepassenger-side undercover. Remove foot shower duct. Remove glove boxframe. On DOHC engines, remove belt lock controller. Remove evaporatornuts and bolts. Remove evaporator.

InstallationTo install, reverse removal procedure. Coat new "O" rings

with refrigerant oil before assembling connections. Evacuate andrecharge A/C system.

Fig. 26: Exploded View Of Evaporator AssemblyCourtesy of Mitsubishi Motor Sales of America

COMPRESSOR


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recovery/recycling equipment. Remove compressor belt. Disconnect andplug discharge and suction hoses at compressor.

2) Remove "O" rings and discard. On DOHC engines, removecondenser fan assembly and alternator. Remove compressor with mountingbolts set in compressor. On SOHC engines, remove compressor. On allengines, use care not to spill compressor oil.

Installation1) If a new compressor is being installed, measure amount

(ounces) of oil in old compressor. Subtract amount of oil in oldcompressor from new compressor oil capacity (5.3 ounces). Theremainder of oil represents system oil capacity.

2) To complete installation, reverse removal procedure. OnDOHC engines, install compressor with mounting bolts set incompressor. On all engines, coat new "O" rings with refrigerant oilbefore assembling connections. Evacuate and charge system.

CONDENSER & CONDENSER FAN MOTOR


recovery/recycling equipment. Remove parking and front side markerlight set hook. See Fig. 27.

2) Pull parking and front side marker lights toward front ofvehicle to remove. Remove grille mounting screws. Push grille clipclaw section down. Pull grille forward to remove.

3) Remove condenser fan motor assembly. Remove shroud.Disconnect and plug condenser refrigerant lines. Remove insulatormounting bolt. Remove lower insulator. Move radiator toward engine.Move condenser upward and out of vehicle.

InstallationTo install, reverse removal procedure. Coat new "O" rings

with refrigerant oil before assembling connections. Evacuate andcharge system.

Fig. 27: Identifying Side Marker Light Set HookCourtesy of Mitsubishi Motor Sales of America

INSTRUMENT PANEL


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Removal & Installation1) Disable air bag system. See AIR BAG RESTRAINT SYSTEM

article. Remove ashtray. Remove floor console assembly. Remove plugsfrom knee protector assembly. Remove knee protector assembly.

2) Remove knee protector support bracket. Remove steeringcolumn cover. Remove glove box striker. Remove glove box and glove boxouter case. Remove undercover insulation screw.

3) Remove radio cover panel, radio and tape player. RemoveA/C-heater control panel. Remove cup holder. Remove speaker. Removemetal bezel and instrument cluster. Remove speedometer cable adapter.

4) Remove steering column bolts. Remove harness connector.Remove glove box light switch. Remove instrument panel. To install,reverse removal procedure.

TORQUE SPECIFICATIONS

TORQUE SPECIFICATIONS TABLE

Application Ft. Lbs. (N.m)

Belt Tension Pulley Bolt ......................... 33 (45)Compressor Bracket BoltSedan ........................................... 30 (42)Wagon ..................................... 30-40 (40-55)Engine Coolant Temp. Switch ...................... 25 (35)

INCH Lbs. (N.m)

Condenser Insulator Bolt ........................ 108 (12)

WIRING DIAGRAMS


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Fig. 28: Automatic A/C-Heater System Wiring Diagram (3.0L SOHC)


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Fig. 29: Automatic A/C-Heater System Wiring Diagram (3.0L DOHC)

Ac Heater System Automatic

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