1998 MITSUBISHI MONTERO Service Manual

Fig. 3: Testing A/C Engine Coolant Temperature Switch
Courtesy of Mitsubishi Motor Sales of America.
AIR THERMOSENSOR & AIR INLET SENSOR
1) Disconnect sensor connector at evaporator case. See
Fig. 12 . Using ohmmeter, measure resistance between sensor terminals.
See AIR THERMOSENSOR & AIR INLET SENSOR SPECIFICATIONS table.
2) If resistance is not within specifications, faulty sensor
must be replaced. If resistance is within specifications and all other
components are okay, replace A/C Compressor Control Unit (ACCU).
AIR THERMOSENSOR & AIR INLET SENSOR SPECIFICATIONS TABLE









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Sensor Temperature F (C) Ohms
-20 (-4) .......................................... 12,000
32 (0) .............................................. 4800
50 (10) ............................................. 2800
68 (20) ............................................. 1800
86 (30) ............................................. 1000
104 (40) ............................................. 800









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BLOWER RESISTOR
Disconnect blower resistor connector. Using an ohmmeter,
measure resistance between indicated terminals. See BLOWER RESISTOR
RESISTANCE table. See Fig. 4
BLOWER RESISTOR RESISTANCE TABLE

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Application & Ohms
Terminal No.
2 & 3 .......................................... 0.31-0.35
2 & 1 .......................................... 0.88-1.02
2 & 4 .......................................... 1.82-2.10









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Fig. 4: Testing Blower Resistor
Courtesy of Mitsubishi Motor Sales of America.
BLOWER SWITCH
With blower switch in position indicated in BLOWER SWITCH
CONTINUITY TEST table, ensure continuity exists between terminals
listed. See Fig. 5.
Fig. 5: Identifying Blower Switch Terminals
Courtesy of Mitsubishi Motor Sales of America.
BLOWER SWITCH CONTINUITY TEST TABLE









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Switch Continuity Between
Position Terminal No.
OFF .................................................. (1)
Low ......................................... 1 & 8; 3 & 5
Medium-Low .................................. 1 & 8; 5 & 6
Medium-High .............................. 1, 4 & 8; 2 & 5
High ..................................... 1, 4 & 8; 5 & 7
( 1) - Continuity should not exist between any terminals.









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DUAL-PRESSURE SWITCH
Disconnect dual-pressure connector, and connect a jumper wire
across harness connector terminals. Connect manifold gauge set to
system, and check operating pressures. Dual-pressure switch will allow
compressor operation when system pressure is within specification.
When high or low pressure side of dual-pressure switch is at operation
pressure (ON), condition is normal if there is continuity between the
respective terminals. If continuity is not present when switch is ON,
replace dual-pressure switch. See PRESSURE SWITCH SPECIFICATIONS
table.
PRESSURE SWITCH SPECIFICATIONS TABLE ( 1)









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Application ON Pressure OFF Pressure
psi (kg/cm) psi (kg/cm)
High Pressure ......... 455 (32) .............. 541 (38)
Low Pressure .......... 32 (2.2) .............. 28 (2.0)
( 1) - With ambient temperature at 80
F (27C).








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COMPRESSOR CLUTCH
Disconnect wiring to compressor clutch. Connect battery
voltage directly to A/C compressor clutch wiring harness terminals. If
click is heard, clutch engagement is okay. If click is not heard,
pulley and armature are not making contact. Repair or replace as
necessary.
RELAYS
4-Terminal Relay
1) Remove relay from relay box located in engine compartment.
Using an ohmmeter, check continuity between relay terminals.
Continuity should exist between terminals No. 2 and 4, but not between
terminals No. 1 and 3. See Fig. 6.
2) Connect battery voltage to terminal No. 2, and ground
terminal No. 4. Ensure continuity now exists between terminals No. 1
and 3. If continuity is not as specified, replace relay.

Fig. 6: Testing 4-Terminal Relay
Courtesy of Mitsubishi Motor Sales of America.
REMOVAL & INSTALLATION
* PLEASE READ THIS FIRST *
WARNING: To avoid injury from accidental air bag deployment, read and
carefully follow all SERVICE PRECAUTIONS and DISABLING &
ACTIVATING AIR BAG SYSTEM procedures in AIR BAG RESTRAINT
SYSTEM article.
NOTE: For removal and installation procedures not covered in this
article, see HEATER SYSTEM article.
A/C CONTROL UNIT (ACCU)
Removal & Installation
Lower glove box. Remove 2 clips on top of evaporator, and
remove ACCU. Disconnect wiring harness from ACCU. To install, reverse
removal procedure. See Fig. 7.
Fig. 7: Locating A/C Control Unit (ACCU)
Courtesy of Mitsubishi Motor Sales of America.

A/C SWITCH
Removal & Installation
Lower glove box. Remove instrument cover. Remove lap cooler
and foot shower ducts. Remove center panel and A/C-heater control
panel. Remove bezel and knob. Disconnect A/C switch connector, and
remove A/C switch. To install, reverse removal procedure.
A/C ENGINE COOLANT TEMPERATURE SWITCH
Removal & Installation
Drain coolant below level of thermostat housing. See Fig. 8.
Remove A/C engine coolant temperature switch wiring harness connector,
and unscrew A/C engine coolant temperature switch from thermostat
housing. To install, reverse removal procedure. Tighten A/C engine
coolant temperature switch to specification. See TORQUE SPECIFICATIONS
. Add coolant and check for leaks.
Fig. 8: Locating A/C Engine Coolant Temperature Switch
Courtesy of Mitsubishi Motor Sales of America.
BLOWER MOTOR & RESISTOR
Removal & Installation
Remove right side foot shower duct. Disconnect blower and/or
resistor. Remove blower motor and/or resistor. See Fig. 9. To install,
reverse removal procedure.

Fig. 9: Exploded View Of Blower Assembly
Courtesy of Mitsubishi Motor Sales of America.
COMPRESSOR

Removal & Installation
Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Loosen idler pulley, and remove belt.
Disconnect compressor electrical connector. Remove high and low
pressure lines and "O" rings from compressor. Remove compressor
mounting bolts. Remove compressor. To install, reverse removal
procedure. See Fig. 10.
Fig. 10: Exploded View Of Compressor Mounting (Typical)
Courtesy of Mitsubishi Motor Sales of America.
CONDENSER

Removal & Installation
1) Discharge A/C system, using approved refrigerant
recovery/recycling equipment. Remove front grille and grille brackets.
Remove hood latch bracket mounting bolt. Remove hood latch brace.
Remove A/T oil cooler and engine oil cooler mounting bolts and
brackets.
2) Remove receiver bracket and receiver. Remove condenser fan
motor. Disconnect pressure lines from condenser. Remove condenser
mounting bolts. Lift condenser from vehicle. To install, reverse
removal procedure. See Fig. 11. If replacing condenser, add 1.4 ounces
of refrigerant oil to new condenser.
Fig. 11: Exploded View Of Condenser & Condenser Fan Motor
Courtesy of Mitsubishi Motor Sales of America.
EVAPORATOR ASSEMBLY