Mitsubishi Montero (2002-2004). Manual — part 110

SPECIAL TOOLS

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-133

SPECIAL TOOLS

M1554000600028

ON-VEHICLE SERVICE

CHARGING

M1552001200049

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.

TOOL

TOOL NUMBER AND
NAME

SUPERSESSION

APPLICATION

MB991502 Scan tool
(MUT-II)

MB991496-OD

Diagnostic trouble code check

MB991223
Harness set
A: Connector pin
contact pressure
check
B: Power circuit check
C: Power circuit check
D: Commercial tester
connection

MB991223
MB991709-01

Continuity check and voltage
measurement at the harness
connector
A: Connector pin contact pressure
check
B: Power circuit check
C: Power circuit check
D: Commercial tester connection

B991502

MB991223

A

AB

B

C

D

ON-VEHICLE SERVICE

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-134

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 140
cm

3

(4.7 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 changed, 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)

PERFORMANCE TEST

M1554008800037

1. The vehicles to be tested should be in a place that is not in

direct sunlight.

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

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

ON-VEHICLE SERVICE

TSB Revision

AUTOMATIC AIR CONDITIONING

55B-135

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.

11.Insert a thermistor-type thermometer into the air vent shown

in the figure, and measure the air temperature.

12.Note the discharge air temperature.

NOTE: If the clutch cycles, take the reading before the
clutch disengages.

Performance Temperature Chart <Front-A/C test>

Performance Temperature Chart <Rear-A/C test>

ACX01485 AB

THERMOMETER

AC002699AB

THERMOMETER

GARAGE AMBIENT
TEMPERATURE

°C (°F)

20 (68)

25 (77)

35 (95)

40 (104)

Discharge air
temperature

°C (°F)

3.5

− 5.5 (38 − 42) 3.5 − 5.5 (38 − 42) 4.5 − 6.5 (40 − 44) 5.5 − 7.5 (42 − 46)

Compressor high
pressure kPa (psi)

1,050

− 1,250 (152

− 181)

1,050

− 1,250 (152

− 181)

1,400

− 1,600 (203

− 232)

1,650

− 1,850 (239

− 268)

Compressor low
pressure kPa (psi)

120

− 140 (17 −

20)

120

− 140 (17 −

20)

130

− 150 (19 −

22)

160

− 180 (23 −

26)

GARAGE AMBIENT
TEMPERATURE

°C (°F)

20 (68)

25 (77)

35 (95)

40 (104)

Discharge air
temperature

°C (°F)

5.5

− 7.5 (42 − 46) 5.5 − 7.5 (42 − 46) 6.5 − 8.5 (44 − 47) 7.5 − 9.5 (46 − 49)

Compressor high
pressure kPa (psi)

1,150

− 1,350 (167

− 196)

1,150

− 1,350 (167

− 196)

1,500

− 1,700 (218

− 247)

1,750

− 1,950 (254

− 283)

Compressor low
pressure kPa (psi)

130

− 150 (19 −

22)

130

− 150 (19 −

22)

140

− 160 (20 −

23)

180

− 200 (26 −

29)

A/C CONTROL PANEL AND A/C CONTROL UNIT

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AUTOMATIC AIR CONDITIONING

55B-136

A/C CONTROL PANEL AND A/C CONTROL UNIT

REMOVAL AND INSTALLATION

M1554001000030

DISASSEMBLY AND ASSEMBLY

M1554012200016

ACX01411

1

2

AB

REMOVAL STEPS

1.

CENTER PANEL (REFER TO
GROUP 52A, INSTRUMENT
PANEL

P.52A-2

.)

2.

A/C CONTROL UNIT (A/C-ECU)

AC205250

1

2

3

4

5

6

7

AB

DISASSEMBLY STEPS

1.

KNOB

2.

PANEL

<<A>>

3.

CONTROL PANEL

<<A>>

4.

FOLDER

5.

FLEXIBLE FLAT CABLE (FFC)

6.

A/C-ECU

7.

CASE

DISASSEMBLY STEPS (Continued)