heater MITSUBISHI MONTERO 2000 Service User Guide
[x] Cancel search | Manufacturer: MITSUBISHI, Model Year: 2000, Model line: MONTERO, Model: MITSUBISHI MONTERO 2000Pages: 1839, PDF Size: 29.19 MB
Page 1573 of 1839
54A-3
ON-VEHICLE SERVICE 46......................
Room Lamp Delay-off Time Adjustment
Procedure 46...............................
REAR COMBINATION LAMP 47...........
SPECIAL TOOLS 47...........................
TROUBLESHOOTING 47.......................
REAR COMBINATION LAMP 47................
HIGH-MOUNTED STOP LAMP 48.........
COLUMN SWITCH 48....................
SPECIAL TOOLS 48...........................
COLUMN SWITCH 48..........................
HAZARD WARNING LAMP SWITCH 50....
SPECIAL TOOLS 50...........................
HAZARD WARNING LAMP SWITCH 50.........
HORN 51................................
CIGARETTE LIGHTER 51.................
ACCESSORY SOCKET 51................
RHEOSTAT 52...........................
CLOCK OR CENTER DISPLAY 53........
TROUBLESHOOTING 53.......................
CLOCK OR CENTER DISPLAY 67..............
RADIO/TAPE PLAYER 68.................
TROUBLESHOOTING 68.......................
RADIO AND CD AUTO CHANGER 81..........
FRONT SPEAKERS 82...................
REAR SPEAKERS 82.....................
ANTENNA83 ............................DEFOGGER 86...........................
TROUBLESHOOTING
ON-VEHICLE SERVICE 86.....................
Printed Heater Check 86.....................
Defogger Relay Continuity Check 86...........
DEFOGGER SWITCH 87.......................
SMART WIRING SYSTEM (SWS)
Refer to GROUP 54B ....................
RADIATOR (RADIATOR FAN MOTOR)
Refer to GROUP 14 ......................
AUTOMATIC TRANSMISSION
Refer to GROUP 23 ......................
ANTI-LOCK BRAKE SYSTEM (ABS)
Refer to GROUP 35B ....................
DOOR HANDLE LATCH (DOOR LOCK)
Refer to GROUP 42 ......................
DOOR GLASS-REGULATOR (POWER
WINDOWS)
Refer to GROUP 42 ......................
KEYLESS ENTRY SYSTEM
Refer to GROUP 42 ......................
WINDSHIELD WIPER/WASHER
Refer to GROUP 51 ......................
REAR WIPER/WASHER
Refer to GROUP 51 ......................
SRS AIRBAG Refer to GROUP 52B......
HEATER Refer to GROUP 55.............
AIR CONDITIONER Refer to GROUP 55...
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Page 1747 of 1839
HEATER, AIR
CONDITIONER AND
VENTILATION
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Page 1748 of 1839
55A-2
HEATER, AIR
CONDITIONER AND
VENTILATION
CONTENTS
SERVICE SPECIFICATIONS 3.................
LUBRICANTS 3..............................
TROUBLESHOOTING
TROUBLESHOOTING
ON-VEHICLE SERVICE 9.....................
Refrigerant Level Test through Performance Test 9.
Magnetic Clutch Test 10.........................
Receiver Drier Test 10..........................
Compressor Drive Belt Adjustment 10.............
Dual Pressure Switch Check 10..................
Charging 11...................................
Performance Test 15............................
Front Blower Relay and Rear Blower Relay
Continuity Check 18............................
Continuity Check of A/C Compressor Relay and
Condernser Fan Relay 18.......................
PTC Heater Relay Continuity Check 19...........
Idle-up Operation Check
Vacuum Actuator Check
Idle-up Solenoid Valve Check 21.................
Clean Air Filter Replacement Procedure 22........
FRONT A/C 23..............................
Air Conditioner Control Panel Assembly and
A/C Switch 23.................................
Heater Unit and Blower Assembly 26.............
Blower Motor and Resistor 29....................
Inside/Outside Air Changeover Damper Motor 30...
Automatic Compressor-ECU and
Air Thermo Sensor Assembly 31.................
REAR HEATER AND REAR COOLER 32.....
Rear A/C Switch, Front Rear Fan Switch 32.......
Rear A/C Control Unit 34........................
Rear Heater Unit 34............................
Rear Heater Unit and Rear Blower Assembly 37....
HEAT SWITCH 40...........................
COMPRESSOR 41...........................
CONDENSER ASSEMBLY AND
CONDENSER FAN 45........................
REFRIGERANT LINE 47.....................
ENGINE COOLANT TEMPERATURE SWITCH
51 ..........................................
IDLE-UP SYSTEM 53........................
DUCTS 54..................................
VENTILATION 56............................
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Page 1749 of 1839
HEATER, AIR CONDITIONER AND VENTILATION - Service Specifications/Lubricants55A-3
SERVICE SPECIFICATIONS
ItemStandard value
Idle speed r/minDiesel4D56750±100
(N or P range)4M41750±50
Idle-up speed r/min4D56925±25
(N or P range)4M41A/CWhen the
A/C is under
low or me-
dium load800±50
When the1,000±50
A/C is under
high load
Water temperature switch_CA/C cut-offON108
OFF11 5
Condenser fanOFF97
ON102
Resistor resistance (Front A/C)WBetween terminals 2 and 40.39±7%
Between terminals 1 and 21.49±7%
Between terminals 2 and 32.79±7%
Resistance of the rear air conditioner switch (temperature control switch) kW
Potentiometer for air mix damper kW
Resistor resistance [Rear heater (frontBetween terminals 1 and 64.9±7%
console)]WBetween terminals 1 and 31.25±7%
Resistor resistance [Rear heater (quarterBetween terminals 1 and 64.9±7%
trim), rear heater]WBetween terminals 1 and 31.25±7%
Idle-up solenoid valve resistanceW40
Air compressor air gap mm0.35 - 0.65
LUBRICANTS
ItemSpecified lubricantsQuantity
Compressor oil mLExcept for vehicles with rear coolerDENSO OIL 8120±20
Vehicles with rear coolerDENSO OIL 8140±20
Pipe connectionsDENSO OIL 8As required
Refrigerant gExcept for vehicles with rear coolerR134a (HFC-134a)500±20
Vehicles with rear coolerR134a (HFC-134a)780±20
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Page 1750 of 1839
HEATER, AIR CONDITIONER AND VENTILATION - Troubleshooting55A-4
TROUBLESHOOTING
Trouble symp-
tomProbable causeRemedyRefer-
ence
page
The air condi-Malfunction of fuseReplace the fuse.–
tioner does notMalfunction of harness or connectorRepair the harness or connector.–work.
Refrigerant leak or overfilling of refrigerantReplenish the refrigerant, repair the leak
or take out some of the refrigerant.–
A/C compressor relay is defective.Replace the A/C compressor relay.55A-18
The A/C compressor magnetic clutch is
defective.Replace the A/C compressor.55A-10
The dual pressure switch is defective.Replace the dual-pressure switch.55A-10
The A/C switch is defective.Replace the heater control assembly.55A-24
The blower switch is defective.Replace the heater control assembly.55A-24
The air thermo sensor is defective.Replace the automatic compressor-ECU
and the air thermo sensor assembly.55A-31
The automatic compressor-ECU is defec-
tive.Replace the automatic compressor-ECU
and the air thermo sensor assembly.55A-6
The engine-ECU is defective.Replace the engine-ECU.–
When the A/C
is operating,Refrigerant leakReplenish the refrigerant and repair the
leak.–
temperature
inside the pas-The dual pressure switch is defective.Replace the dual-pressure switch.55A-10inside the pas-
senger
The condenser fan relay is defective.Replace the condenser fan relay.55A-18compartment
doesn’t de-
A/C compressor relay is defective.Replace the A/C compressor relay.55A-18
crease (cool
air is not
emitted).The A/C compressor magnetic clutch is
defective.Replace the A/C compressor.55A-10
When the A/C
is operating,
temperature
inside the pas-
senger
compartment
doesn’t in-
crease (warm
air is not
emitted).Malfunction of the air thermo sensorReplace the automatic compressor-ECU
and the air thermo sensor assembly.55A-31
The blowerMalfunction of fuseReplace the fuse.–
motor does notMalfunction of harness or connectorRepair the harness or connector.–run.
The blower relay is defective.Replace the blower relay.55A-18
The blower motor is defective.Replace the blower motor.55A-29
The blower switch is defective.Replace the heater control assembly.55A-24
Malfunction of the resistorReplace the resistor.55A-29
The automatic compressor-ECU is defec-
tive.Replace the automatic compressor-ECU
and the air thermo sensor assembly.55A-6
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Page 1753 of 1839
HEATER, AIR CONDITIONER AND VENTILATION - Troubleshooting55A-7
TROUBLESHOOTING
Trouble symp-
tomProbable causesRemedyRefer-
ence
page
The rear cool-Malfunction of fuseReplace the fuse.–
er does notMalfunction of harness or connectorRepair the harness or connector.–operate.
Refrigerant leak or overfilling of refrigerantReplenish the refrigerant, repair the leak
or take out some of the refrigerant.–
Malfunction of the rear A/C switchReplace the rear A/C switch.55A-32
Malfunction of the front rear fan switchReplace the front rear fan switch.55A-33
Malfunction of the air thermo sensorReplace the air thermo sensor.55A-39
Malfunction of the rear blower relayReplace the rear blower relay.55A-18
The rear blower motor is defective.Replace the rear blower motor.55A-40
The rear cooler control unit is defective.Replace the rear cooler control unit.55A-34
When the rear
cooler is oper-
ating, temper-
ature inside
the passenger
compartment
does not de-
crease(cool air
is not emitted).Refrigerant leakReplenish the refrigerant and repair the
leak.–
When the rear
heater is oper-
ating, temper-
ature inside
the passenger
compartment
does not in-
crease(warm
air is not
emitted).Malfunction of the air thermo sensorReplace the air thermo sensor.55A-39
The blowerMalfunction of fuseReplace the fuse.–
motor does notMalfunction of harness or connectorRepair the harness or connector.–run.
Malfunction of the rear blower relayReplace the blower relay.55A-18
The rear blower motor is defective.Replace the blower motor.55A-40
Malfunction of the rear A/C switchReplace the rear A/C switch.55A-32
Malfunction of the front rear fan switchReplace the front rear fan switch.55A-33
Malfunction of the resistorReplace the resistor.55A-35
The rear cooler control unit is defective.Replace the rear cooler control unit.55A-34
The blowerMalfunction of fuseReplace the fuse.–
motor does notMalfunction of harness or connectorRepair the harness or connector.–stop running.
Malfunction of the rear A/C switchReplace the rear A/C switch.55A-32
Malfunction of the front rear fan switchReplace the front rear fan switch.55A-33
Malfunction of the resistorReplace the resistor.55A-35
The rear cooler control unit is defective.Replace the rear cooler control unit.55A-34
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Page 1763 of 1839
HEATER, AIR CONDITIONER AND VENTILATION - On-vehicle Service55A-17
REFRIGERANT LEAK REPAIR
LOST CHARGE
If the system has lost all charge due to a leak:
1. Evacuate the system. (See procedure.)
2. Charge the system with approximately one
pound of refrigerant.
3. Check for leaks.
4. Discharge the system.
5. Repair leaks.
6. Replace receiver drier.
Caution
Replacement filter-drier units must be
sealed while in storage. The drier used in
these units will saturate water quickly upon
exposure to the atmosphere. When
installing a drier, have all tools and supplies
ready for quick reassembly to avoid keeping
the system open any longer than necessary.
7. Evacuate and charge system.
LOW CHARGE
If the system has not lost all of its refrigerant charge;
locate and repair all leaks. If it is necessary to
increase the system pressure to find the leak
(because of an especially low charge) add
refrigerant. If it is possible to repair the leak without
discharging the refrigerant system, use the
procedure for correcting low refrigerant level.HANDLING TUBING AND FITTINGS
Kinks in the refrigerant tubing or sharp bends in
the refrigerant hose lines will greatly reduce the
capacity of the entire system. High pressures are
produced in the system when it is operating.
Extreme care must be exercised to make sure that
all connections are pressure tight. Dirt and moisture
can enter the system when it is opened for repair
or replacement of lines or components. The
following precautions must be observed. The
system must be completely discharged before
opening any fitting of connection in the refrigeration
system. Open fittings with caution even after the
system has been discharged. If any pressure is
noticed as a fitting is loosened, allow trapped
pressure to bleed off very slowly.
Never attempt to rebend formed lines to fit. Use
the correct line for the installation you are servicing.
A good rule for the flexible hose lines is keep the
radius of all bends at least 10 times the diameter
of the hose.
Sharper bends will reduce the flow of refrigerant.
The flexible hose lines should be routed so that
they are at least 80 mm from the exhaust manifold.
It is good practice to inspect all flexible hose lines
at least once a year to make sure they are in good
condition and properly routed.
Unified plumbing connections with O-rings, these
O-rings are not reusable.
COMPRESSOR NOISE
You must first know the conditions when the noise
occurs. These conditions are: weather, vehicle
speed, in gear or neutral, engine temperature or
any other special conditions.
Noises that develop during A/C operation can often
be misleading. For example: what sounds like a
failed front bearing or connecting rod, may be
caused by loose bolts, nuts, mounting brackets,
or a loose clutch assembly. Verify accessory drive
belt tension (power steering or alternator).
Improper accessory drive belt tension can cause
a misleading noise when the compressor is
engaged and little or no noise when the compressor
is disengaged.
Drive belts are speed-sensitive. That is, at different
engine speeds, and depending upon belt tension,
belts can develop unusual noises that are often
mistaken for mechanical problems within the
compressor.ADJUSTMENT
1. Select a quiet area for testing. Duplicate
conditions as much as possible. Switch
compressor on and off several times to clearly
identify compressor noise. To duplicate high
ambient conditions (high head pressure),
restrict air flow through condenser. Install
manifold gauge set to make sure discharge
pressure doesn’t exceed 2,070 kPa.
2. Tighten all compressor mounting bolts, clutch
mounting bolt, and compressor drive belt.
Check to assure clutch coil is tight (no rotation
or wobble).
3. Check refrigerant hoses for rubbing or
interference that can cause unusual noises.
4. Check refrigerant charge. (See “Charging
System”.)
5. Recheck compressor noise as in Step 1.
6. If noise still exists, loosen compressor mounting
bolts and retorque. Repeat Step 1.
7. If noise continues, replace compressor and
repeat Step 1.
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Page 1803 of 1839
HEATER, AIR
CONDITIONER AND
VENTILATION
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Page 1804 of 1839
55B-1
HEATER, AIR
CONDITIONER AND
VENTILATION
CONTENTS
SERVICE SPECIFICATIONS 2.................
LUBRICANTS 2..............................
SPECIAL TOOLS 3...........................
TROUBLESHOOTING
TROUBLESHOOTING
ON-VEHICLE SERVICE 24...................
Magnetic Clutch Test 24.........................
Idle Up Operation Check
FRONT A/C 25..............................
Automatic A/C Control Panel Assembly
(A/C-ECU) 25..................................Blower Linear Controller 26......................
Air Mix Damper Motor and
Air Outlet Changeover Damper Motor 27..........
Heater Water Temperature Sensor 29.............
PHOTO SENSOR 30........................
OUTSIDE AIR TEMPERATURE SENSOR 30..
REAR A/C 30...............................
Electric Motor for Air Outlet Changeover
Damper 30....................................
REFRIGERANT LINE 31.....................
COMPRESSOR 33...........................
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Page 1805 of 1839
HEATER, AIR CONDITIONER AND VENTILATION -Service Specifications/Lubricants55B-2
SERVICE SPECIFICATIONS
ItemStandard value
Resistance value of the potentiometer for the air mix damper (front A/C) kWApprox. 0.96 - 5.76
Resistance value of the potentiometer for the air outlet changeover damper (front A/C)
kWApprox. 0.96 - 5.76
Resistance of the rear air conditioner switch (temperature control switch)
Resistance of the potentiometer for the air mix damper
Resistance value of the resistor (rear A/C)Between terminals 1 and 64.9±7%
WBetween terminals 1 and 31.25±7%
Air compressor air gap mm0.35 - 0.65
Idle speed r/min (N or P range)Petrol600±50
Idle-up speed r/min (N or P range)PetrolWhen the A/C is under
low load700±50
When the A/C is under
medium load800±50
When the A/C is under
high load1,000±50
LUBRICANTS
ItemBrandQuantity
Compressor oil mlSingle A/C
Single air conditioner
Pipe connectionsDENSO OIL 8As required
Refrigerant gSingle A/C
Single air conditioner
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