Mitsubishi Montero (2004+). Manual - part 624

REAR HEATER UNIT

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-139

INSPECTION

M1554010700026

.

BLOWER MOTOR CHECK
When battery voltage is applied between the terminals, check 
that the motor operates. Also, check that there is no abnormal 
noise.

.

RESISTOR CHECK
Use an ohmmeter to measure the resistance between the ter-
minals. Check that the measured value is at the standard 
value.

AC001038 AB

TESTER CONNECTION

STANDARD VALUE 

Ω

1 

− 6

4.9 

± 0.343

1 

− 3

1.25 

± 0.0875

AC001039AB

COMPRESSOR ASSEMBLY

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-140

COMPRESSOR ASSEMBLY

REMOVAL AND INSTALLATION

M1552004400150

Pre-removal Operation
Refrigerant discharging (Refer to 

P.55A-113

).

Post-installation Operation
• Refrigerant charging (Refer to 

P.55A-113

).

• Drive Belt Tension Adjustment (Refer to GROUP 00, 

Maintenance Service 

− Drive Belts 

P.00-41

).

AC001052

1

2

3

5

6

N

4

9.8 ± 2 N·m
87 ± 17 in-lb

REMOVAL STEPS

<<A>>

1.

DRIVE BELT

<<B>>

2.

DISCHARGE HOSE

<<B>>

3.

SUCTION HOSE

4.

O-RING

<<C>>

>>A<<

5.

COMPRESSOR

6.

COMPRESSOR BRACKET

REMOVAL STEPS (Continued)

COMPRESSOR ASSEMBLY

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-141

REMOVAL SERVICE POINTS

.

<<A>> DRIVE BELT REMOVAL

CAUTION

When reusing the drive belt, mark an arrow which indi-
cates the turning direction (right turn) on the back of the 
drive belt with a chalk, etc.
Insert the socket-wrench handle into the tool hole for auto-ten-
sioner and turn it to the arrow direction. Reduce the drive belt 
tension and remove the drive belt.

.

<<B>> DISCHARGE HOSE/SUCTION HOSE 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 compressor nipple to prevent 
foreign matter from getting into them.

.

<<C>> COMPRESSOR REMOVAL
When removing the compressor, be careful not to spill the com-
pressor oil.

INSTALLATION SERVICE POINT

.

>>A<< COMPRESSOR INSTALLATION
If a new compressor is installed, first adjust the amount of oil 
according to the procedures described below, and then install 
the compressor.
1. Measure the amount [X cm

3

 (X floz)] of oil within the 

removed compressor.

2. Drain (from the new compressor) the amount [Y cm

3

 (Y 

floz)] of oil calculated according to the following formula, and 
then install the new compressor.

<Vehicles without rear cooler or rear A/C>
 New compressor oil amount = 120cm

3

 (4.2 floz) 

<Vehicles with rear cooler or rear A/C>
 New compressor oil amount = 140cm

3

 (4.9 floz) 

<Vehicles without rear cooler or rear A/C>
120 cm

3

 

− X cm

3

 = Y cm

3

 (4.2 floz 

− X floz = Y floz) 

<Vehicles with rear cooler or rear A/C>
140 cm

3

 

− X cm

3

 = Y cm

3

 (4.9 floz 

− X floz = Y floz) 

NOTE: Y cm

3

 (Y floz) indicates the amount of oil in the refriger-

ant line, the condenser, the evaporator, etc.
NOTE: When replacing the following parts at the same times as 
the compressor, subtract the rated oil amount of the each part 
from Y cm

3

 (Y floz) and discharge from the new compressor.

Quantity:

• Evaporator: 60 cm

3

 (2.0 floz)

• Condenser: 15 cm

3

 (0.5 floz)

ACX00838 AC

COMPRESSOR ASSEMBLY

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55A-142

• Suction hose: 10 cm

3

 (0.3 floz)

• Receiver: 10 cm

3

 (0.3 floz) 

INSPECTION

M1552004500191

AIR CONDITIONING COMPRESSOR CLUTCH 
OPERATION INSPECTION

Connect the positive battery terminal to the air conditioning 
compressor clutch connector terminal 3, and ground the nega-
tive battery terminal to the body of the compressor. The condi-
tion is normal if the sound of the a/c compressor clutch (click) 
can be heard.

COMPRESSOR

M1552004600284

DISASSEMBLY AND ASSEMBLY

ACX01440AB

AC002662

1

2

3

4

5

6

7

14 ± 3 N·m
120 ± 24 in-lb

AB

DISASSEMBLY STEPS

>>C<<

•

AIR GAP ADJUSTMENT

1. LOCK SENSOR

<<A>>

2. ARMATURE PLATE

>>B<<

3. SNAP RING

4. ROTOR
5. SNAP RING

>>A<<

6. CLUTCH COIL
7. SHIMS

DISASSEMBLY STEPS