Mitsubishi Montero (2004+). Manual — part 623

REAR HEATER UNIT

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-135

REMOVAL SERVICE POINT

.

<<A>> SUCTION PIPE C/LIQUID PIPE D REMOVAL

CAUTION

Seal the hoses completely, otherwise the compressor oil
and receiver will absorb water vapor easily, possibly dam-
aging the compressor and deteriorating performance.
Plug the disconnected hose and rear heater unit nipple to pre-
vent foreign matter from getting into them.

REAR HEATER UNIT REMOVAL
STEPS

•

REFRIGERANT DISCHARGE AND
REFILLING <VEHICLES WITH
REAR COOLER OR REAR A/C>
(REFER TO

P.55A-113

.)

•

ENGINE COOLANT DRAINING
AND REFILLING <VEHICLES
WITH REAR HEATER OR REAR
A/C> (REFER TO GROUP 00,
MAINTENANCE SERVICE -
ENGINE COOLANT

P.00-46

.)

•

REAR MUD GUARD (REFER TO
GROUP 51, MUD GUARD

P.51-19

.)

1.

HEATER UNDER COVER

<<A>>

2.

SUCTION PIPE C <VEHICLES
WITH REAR COOLER OR REAR
A/C>

<<A>>

3.

LIQUID PIPE D <VEHICLES WITH
REAR COOLER OR REAR A/C>

4.

O-RING <VEHICLES WITH REAR
COOLER OR REAR A/C>

5.

HEATER HOSES <VEHICLES
WITH REAR HEATER OR REAR
A/C>

6.

REAR HEATER UNIT
REAR BLOWER ASSEMBLY
REMOVAL STEPS

•

UPPER QUARTER TRIM (RH)
AND LOWER QUARTER TRIM
(RH) (REFER TO GROUP 52A,
TRIMS

P.52A-8

.)

•

REAR QUARTER DUCT, REAR
FLOOR DUCT A MOUNTING
BOLT AND PILLAR DUCT
MOUNTING BOLT (REFER TO

P.55A-149

.)

7.

REAR BLOWER ASSEMBLY

REAR HEATER UNIT REMOVAL
STEPS (Continued)

REAR HEATER UNIT

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-136

REAR HEATER UNIT DISASSEMBLY AND ASSEMBLY

M1554010300028

AC001677AB

9

10

9

8

7

5

4

3

2

1

N

N

N

6

DISASSEMBLY STEPS

1.

TUBE ACCESSORY ASSEMBLY
<VEHICLES WITH REAR
COOLER OR REAR A/C>

2.

HEATER COVER

3.

HARNESS ASSEMBLY

4.

AIR MIX DAMPER MOTOR
<VEHICLES WITH REAR HEATER
OR REAR A/C>

5.

AIR THERMO SENSOR
<VEHICLES WITH REAR
COOLER OR REAR A/C>

6.

HEATER CORE <VEHICLES WITH
REAR HEATER OR REAR A/C>

7.

JOINT <VEHICLES WITH REAR
COOLER OR REAR A/C>

8.

EXPANSION VALVE <VEHICLES
WITH REAR COOLER OR REAR
A/C>

9.

HEATER CASE

10. EVAPORATOR <VEHICLES WITH

REAR COOLER OR REAR A/C>

DISASSEMBLY STEPS

REAR HEATER UNIT

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-137

INSPECTION

M1554010400025

.

AIR MIX DAMPER MOTOR CHECK <VEHICLES WITH REAR
HEATER OR REAR A/C>

CAUTION

Do not apply battery voltage when the damper is in the
MAX HOT/MAX COOL position.
Check the air mix damper motor by the following procedures.

.

AIR MIX DAMPER POTENTIOMETER CHECK <VEHICLES
WITH REAR HEATER OR REAR A/C>
When checking the air mix damper motor, measure the resis-
tance value between the terminals 3 and 5, between the termi-
nals 3 and 7. At this time, make sure that the measured
resistance value changes slowly within the standard value.

Standard value: 1.2

− 4.8 kΩ

.

AIR THERMO SENSOR CHECK <VEHICLES WITH REAR
COOLER OR REAR A/C>
NOTE: The temperature conditions when checking should not
exceed the range shown in the diagram.
When the resistance between the sensor terminals is mea-
sured under two or more temperature conditions, the resis-
tance should approximately satisfy the illustrated values.

.

LEVER
POSITION

BATTERY
CONNECTION

LEVER
OPERATION

At the MAX
COOL
position

• Connect terminal 1 to

the positive battery
terminal

• Connect terminal 2 to

the negative battery
terminal

The lever moves
from the MAX
COOL position to
the outside air
position

At the MAX
HOT position

• Connect terminal 2 to

the positive battery
terminal

• Connect terminal 1 to

the negative battery
terminal

The lever moves
from the MAX HOT
position to the
inside air position

AC001049AB

MAX HOT POSITION

MAX
COOL
POSITION

AC001043

RESISTANCE k

Ω

8

6

4

2

0

-10

0

10

20

30

40

TEMPERATURE ˚C(˚F)

AB

(14)

(32)

(50)

(86)

(104)

(68)

REAR HEATER UNIT

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-138

EXPANSION VALVE (MAGNET VALVE) CHECK <VEHICLES
WITH REAR A/C SYSTEM>
When battery voltage is applied to the magnetic valve terminal
No.1 and No.2 terminal is ground, operating sound should be
heard from the magnetic valve.

REAR BLOWER DISASSEMBLY AND REASSEMBLY

M1554010600029

1 2

AC205153

AC001679AB

1

4

2

5

3

DISASSEMBLY STEPS

1.

HARNESS ASSEMBLY

2.

RESISTOR

3.

AIR OUTLET CHANGEOVER
DAMPER MOTOR

4.

BLOWER MOTOR ASSEMBLY

5.

CASE

DISASSEMBLY STEPS