Mitsubishi Montero (1991+). Manual — part 20

Montero

1) Move temperature selector lever to far left position.

Remove heater control valve cover. Disconnect heater control valve

wire from blend door lever. Push heater control valve inward (closed).

2) Move blend door lever downward in direction indicated by

arrow. See Fig. 3. Connect inner wire to lever, and secure outer

housing using clip. Adjust heater control valve wire so valve is fully

closed. Operate mode control knob to ensure proper operation.

Reinstall heater control valve cover.

Fig. 3: Adjusting Temperature Selection Cable (Montero)

Courtesy of Mitsubishi Motor Sales of America.

TROUBLE SHOOTING

AIR NOT COOL

1) Ensure compressor clutch is operating. If compressor

clutch is not operating, check fuses and relay. Check A/C switch.

Check high and low pressure switches or dual pressure switch. Check

thermistor, thermo relay or Electronic Cycling Clutch Switch (ECCS).

Check blower switch and relay. Check A/C compressor clutch coil.

2) Ensure system is properly charged with correct amount of

refrigerant. Add refrigerant or evacuate and recharge system as

necessary. Ensure receiver-drier is not clogged. Check compressor belt

for proper tension. Check for clogged expansion valve. Check

compressor operation. Repair or replace compressor as necessary.

INSUFFICIENT AIRFLOW

Check for air leakage at air duct joint. Check for frost on

evaporator. Ensure blower motor is operating properly. Check for

obstructed air intake.

INSUFFICIENT COOLING

Ensure system is properly charged with correct amount of

refrigerant and free of air and moisture. Add refrigerant or evacuate

and recharge system as necessary. Ensure receiver-drier is not

clogged. Ensure sufficient airflow through condenser exists. Check

compressor belt for proper tension. Check compressor operation. Repair

or replace compressor as necessary. Check for clogged expansion valve.

Replace expansion valve as necessary.

INTERMITTENT COOL AIR

Check for air or moisture in system. Evacuate and recharge

system as necessary. Check for expansion valve malfunction. Replace

expansion valve if necessary. Check compressor belt for proper

tension.

TESTING

A/C SWITCH

1) Disconnect A/C switch harness connector. Using appropriate

wiring diagram as a guide, jumper appropriate terminals of A/C switch

wiring harness connector. See Fig. 4.

2) Turn blower on and momentarily turn ignition on without

starting engine. Listen for compressor clutch engagement. If

compressor clutch does not engage, check fuse and other components

wired in series with compressor clutch.

Fig. 4: A/C Switch Connector ID

Courtesy of Mitsubishi Motor Sales of America.

AIR THERMO & AIR INLET SENSORS

1) Disconnect sensor connector at evaporator case. Using an

ohmmeter, measure continuity between sensor terminals. See AIR THERMO

& AIR INLET SENSORS SPECIFICATIONS table.

2) If resistance is not within specifications, sensor is

faulty and must be replaced. If resistance is within specifications

and all other components are okay, replace A/C compressor control unit

(if equipped).

AIR THERMO & AIR INLET SENSORS SPECIFICATIONS TABLE

Sensor Temperature Ohms

Air Thermo Sensor

32

F (0

C) . . . . . . . . .. 11,400

50

F (10

C) . . . . . . . . ... 7320

68

F (20

C) . . . . . . . . ... 4860

86

F (30

C) . . . . . . . . ... 3310

104

F (40

C) . . . . . . . . .. 2320

Air Inlet Sensor

32

F (0

C) . . . . . . . . . 3310

50

F (10

C) . . . . . . . . ... 2000

68

F (20

C) . . . . . . . . ... 1250

86

F (30

C) . . . . . . . . . 810

104

F (40

C) . . . . . . . . . 530

BLOWER RESISTOR

Disconnect blower resistor connector. Using an ohmmeter,

measure resistance between terminals indicated in BLOWER RESISTOR

RESISTANCE table. See Fig. 5.

BLOWER RESISTOR RESISTANCE TABLE

Terminal Ohms

Colt Vista

1 & 2 . . . . . . . . Approx. 1.22

1 & 3 . . . . . . . . Approx. 0.41

1 & 4 . . . . . . . . Approx. 2.65

1 & 5 . . . . . . . . ... Approx. 0

Montero (Front)

1 & 2 . . . . . . . . Approx. 1.22

1 & 3 . . . . . . . . Approx. 0.41

1 & 4 . . . . . . . . Approx. 2.25

1 & 5 . . . . . . . . ... Approx. 0

Montero (Rear)

2 & 4 . . . . . . . . . Approx. 0.5

1 & 4 . . . . . . . . . Approx. 1.8

3 & 4 . . . . . . . . . Approx. 3.3

Pickup & Ram-50

1 & 2 . . . . . . . . Approx. 1.19

1 & 3 . . . . . . . . Approx. 0.50

1 & 4 . . . . . . . . Approx. 2.33

1 & 5 . . . . . . . . ... Approx. 0

Fig. 5: 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. 6 or 7.

BLOWER SWITCH CONTINUITY TEST TABLE