Mitsubishi Montero (2004+). Manual — part 617
SPECIAL TOOLS
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-111
SPECIAL TOOLS
M1552000600141
6
Air mixing damper control motor
<Vehicles with rear heater or Rear
A/C>
When the damper is moving toward
the MAX COOL position.
10 V
When the damper is moving toward
the MAX HOT position.
0 V
7
Air mixing damper control motor
potentiometer input signal <Vehicles
with rear heater or Rear A/C>
Air mix damper: MAX HOT position
1 V
Air mix damper: MAX COOL position 4 V
8
Sensor and potentiometer ground
At all times
0 V
9
Air outlet changeover damper motor
signal <Vehicles with Rear A/C>
Ignition switch: ON
0
− 12 V
10
Air outlet changeover damper motor
signal <Vehicles with Rear A/C>
Ignition switch: ON
0
− 12 V
11
Air outlet changeover damper motor
signal <Vehicles with Rear A/C>
Ignition switch: ON
0
− 12 V
12
Air thermo sensor input signal
Sensing part temperature: 25
°C (77
°F) (1.5 kΩ)
2.2 V
13
Rear fan switch or front rear fan
switch input
Rear fan switch or front rear fan
switch: ON
0 V
14
Air mixing damper control motor
(MAX HOT) <Vehicles with rear
heater or Rear A/C>
When the damper is moving toward
the MAX COOL position.
0.5 V
When the damper is moving toward
the MAX HOT position.
Battery positive
voltage
TERMINAL
NO.
INSPECTION ITEM
INSPECTION CONDITION
NORMAL
CONDITION
TOOL
TOOL NUMBER AND
NAME
SUPERSESSION
APPLICATION
MB991367
Special spanner
MB991367-01
Armature mounting nut of
compressor removal and
installation
MB991386
Pin
MIT217213l
MB990784
Ornament remover
General service tool
Center panel removal
B991367
MB990784
ON-VEHICLE SERVICE
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HEATER, AIR CONDITIONING AND VENTILATION
55A-112
ON-VEHICLE SERVICE
REFRIGERANT LEVEL TEST
M1552008400152
Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.
A/C COMPRESSOR CLUTCH TEST
M1552019900087
1. Disconnect the A/C compressor clutch connector to the A/C
compressor clutch.
2. Connect the positive battery terminal to the air conditioning
compressor clutch connector terminal 3, and ground the
negative battery terminal to the body of the compressor.
3. If the A/C compressor clutch is normal, there will be a "click."
If the pulley and armature do not make contact ("click"),
there is a malfunction.
RECEIVER DRIER TEST
M1552008600123
Turn the A/C on. Check the temperature by touching the
receiver drier outlet and inlet pipes. If there is a difference in the
temperatures of the two pipes, the receiver assembly is
restricted. Replace the receiver assembly.
DUAL PRESSURE SWITCH CHECK
M1552010400267
1. Remove the dual pressure switch connector and connect
the high/low pressure side terminals located on the harness
side as shown in the illustration.
2. Install a gauge manifold to the high-pressure side service
valve of the refrigerant line. (Refer to
3. When the high/low pressure sides of the dual pressure
switch are at operation pressure (ON) and there is continuity
between the respective terminals, then the condition is
normal. If there is no continuity, replace the switch.
ACX01440AB
ITEM
OFF to ON
ON to OFF
Low-pressure side
kPa (psi)
223
± 27 (32.4 ±
3.9)
196
± 20 (28.4 ±
2.9)
High-pressure side
kPa (psi)
2,550
± 200 (369.9
± 29)
3,140
± 200
(455.5
± 29)
ACX00822
ON
OFF
196 ± 20
(284 ± 2.9)
223 ± 27
(32.4 ± 3.9)
2,550 ± 200
(369.9 ± 29)
3,140 ± 200
(455.5 ± 29)
kPa
(psi)
DUAL PRESSURE
SWITCH
AF
ON-VEHICLE SERVICE
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-113
COMPRESSOR DRIVE BELT ADJUSTMENT
M1552001000131
Refer to GROUP 00, Maintenance Service
− Drive Belts
.
CHARGING
M1552001200276
Use the refrigerant recovery station to charge the refrigerant.
METHOD BY USING REFRIGERANT RECOVERY
AND RECYCLING UNIT
Using the refrigerant recovery and recycling unit, refill the
refrigerant.
NOTE: Refer to the Refrigerant Recovery and Recycling Unit
Instruction Manual for operation of the unit.
DISCHARGING SYSTEM
Use the refrigerant recovery unit to discharge refrigerant gas
from the system.
NOTE: Refer to the Refrigerant Recovery and Recycling Unit
Instruction Manual for operation of the unit.
REFILLING OF OIL IN THE A/C SYSTEM
Too little oil will provide inadequate compressor lubrication and
cause a compressor failure. Too much oil will increase dis-
charge air temperature.
When a compressor is installed at the factory, it contains 120
cm
3
(4.1 floz) of refrigerant oil. While the A/C system is in oper-
ation, the oil is carried through the entire system by the refriger-
ant. Some of this oil will be trapped and retained in various
parts of the system.
When the following system components are replaced, it is nec-
essary to add oil to the system to replace the oil being removed
with the component.
Compressor oil: SUN PAG 56
Quantity:
• Evaporator: 60 cm
3
(2.0 floz)
• Condenser: 15 cm
3
(0.5 floz)
• Suction hose: 10 cm
3
(0.3 floz)
• Receiver: 10 cm
3
(0.3 floz)
PERFORMANCE TEST
M1554008800026
1. The vehicles to be tested should be in a place that is not in
direct sunlight.
ON-VEHICLE SERVICE
TSB Revision
HEATER, AIR CONDITIONING AND VENTILATION
55A-114
2. Close the high and low-pressure valve of the gauge
manifold.
3. Connect the charging hose (blue) to the low-pressure valve
and connect the charging hose (red) to the high-pressure
valve of the gauge manifold.
4. Install the quick joint (for low-pressure) to the charging hose
(blue), and connect the quick joint (for high-pressure) to the
charging hose (red).
CAUTION
• To connect the quick joint, press section A firmly
against the service valve until a click is heard.
• When connecting, run your hand along the hose while
pressing to ensure that there are no bends in the hose.
5. Connect the quick joint (for low-pressure) to the
low-pressure service valve and connect the quick joint (for
high-pressure) to the high-pressure service valve.
NOTE: The high-pressure service valve is on A/C pipe and
the low-pressure service valve is on the suction hose.
6. Start the engine.
7. Set the A/C controls as follows:
<Testing the front-A/C>
• A/C switch: A/C − ON position
• Mode selection: FACE position
• Temperature control: MAXIMUM COOLING position
• Air selection: RECIRCULATION position
• Blower switch: FAST position
8. Set the A/C controls as follows:
<Testing the rear-A/C>
• The front A/C should be set as described in step 7.
• A/C switch: A/C-ON position
• Temperature control: MAXIMUM COOLING position
• Blower switch: FAST position
9. Adjust engine speed to 1,500 r/min with A/C clutch engaged.
10.Engine should be warmed up with doors and windows
closed.
AC001388
LOW-PRESSURE
VALVE
HIGH-PRESSURE
VALVE
GAUGE MANIFOLD
CHARGING
HOSE (RED)
A
SLEEVE
CHARGING
HOSE (BLUE)
ADAPTOR
VALVE
(FOR
LOW-PRES-
SURE)
ADAPTOR
VALVE
(FOR HIGH-
PRESSURE)
LOW-
PRESSURE
SERVICE
VALVE
HIGH-
PRESSURE
SERVICE
VALVE
AB
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