Mitsubishi Outlander (2013+). Manual - part 746

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-40

COMPRESSOR CHECK

Trouble 
symptom

Check 
method/circumstance

Cause

Measures

Abnormal 
noise from 
compressor 
main body at 
A/C operation 
(rattling 
noise)

• Refrigerant cycle gauge 

pressure check
1. Low pressure side/high 

pressure side pressure 
is high.

2. Pressure hunting 

occurs.

Abnormal noise due to 
excessive refrigerant 
charging

Fill an appropriate amount of 
refrigerant.

• Check the refrigerant 

cycle gauge pressure. 
When the pressure 
difference between the 
low pressure side and 
high pressure side is 
small, remove the 
compressor oil, and 
perform the oil judgment.

Damage to inside the 
compressor

AC610320

Compressor oil judgment result: 
Between transparent and grey/
No contamination with foreign materials

Measures: Replace only the compressor.

Measures: Replace the compressor and the rece

Compressor oil judgment result: 
Between grey and black/
Contaminated with foreign materials

AB

Compressor 
malfunction 
(belt slip)

Check the compressor 
rotation, and if a seizure or 
sticking is present, remove 
the compressor oil, then 
perform a judgment.

SIMPLE INSPECTION OF THE A/C 
PRESSURE SENSOR

M1552014700668

1. Assemble a gauge manifold on the high pressure 

service valve.

ACB03811

A/C pressure sensor

AB

High-pressure
side service valve

AC507502

MB991658

AB

A/C 
pressure 
sensor side

Harness side

2. Disconnect the A/C pressure sensor connector 

and connect the special tool test harness 
(MB991658) as shown.

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-41

3. Start the engine and then turn ON the air 

conditioner switch.

AC208297

0

1

2

3

1

2

3

4

5

AB

Output voltage 

(V)

Refrigerant pressure (MPa)

4. At this time, check to see that the voltage of the 

A/C pressure sensor connector terminal No. 2 
reflects the specifications of the figure.

NOTE: 

.

•

The allowance shall be defined as 

±

5%.

•

The A/C pressure sensor is incorporated in the 
discharge flexible hose, and the high-pressure 
service valve is incorporated in liquid pipe B. 
Therefore, the pressure at the A/C pressure 
sensor is 0.1 to 0.3 MPa higher than that at the 
gauge manifold.

RELAY CHECK

M1552008801562

BLOWER RELAY CONTINUITY CHECK

ACB04411

ACB05913

Blower relay

4

1

3

2

AB

Battery voltage Checking 

terminal

Normal 
condition

Not applied

3 

− 4

No continuity

• Connect 

terminal 1 to 
the positive 
battery 
terminal

• Connect 

terminal 2 to 
the negative 
battery 
terminal

Continuity 
exists (2 

Ω or 

less)

A/C COMPRESSOR RELAY CONTINUITY 
CHECK

ACB04408

ACB05914

A/C compressor relay

3

1

4

2

AB

Battery voltage Checking 

terminal

Normal 
condition

Not applied

3 

− 4

No continuity

• Connect 

terminal 1 to 
the positive 
battery 
terminal

• Connect 

terminal 2 to 
the negative 
battery 
terminal

Continuity 
exists (2 

Ω or 

less)

HEATER CONTROL UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-42

IDLE-UP INSPECTION

M1552001602076

1. Before inspection, set the vehicle to the 

pre-inspection condition.

2. Check that the idling speed is within the standard 

value range.

Standard value:

700 

± 50 r/min

NOTE: The idling speed is controlled by the ISC 
system automatically, so does not require adjust-
ment.

3. Operate the air conditioner by turning on the A/C 

switch. Then check that the idling speed is within 
the standard value range.

Standard value:

750 

± 100 r/min

REPLACE THE CLEAN AIR FILTER

M1552020600529

1. Remove the glove box (Refer to GROUP 52A 

− 

Instrumental panel assembly, ).

2. Loosen the two lugs as shown to replace the 

clean air filter.

ACB03812AB

NOTE: The arrow on the clean air filter should 
face downwards.

7803A004

>PP.PET<

helsatech PF087

Made in

XX.XX.XX

XX:XX

AIR FLOW

AC508409

AC

Front view

Install with the arrow 
facing down.

3. Install the glove box.

HEATER CONTROL UNIT

REMOVAL AND INSTALLATION

M1554014700910

Pre-removal and Post-installation Operation
• Centre panel assembly (Refer to GROUP 52A, Instrument 

panel assembly )

ACB05963

1

1.6 ± 0.4 N·m

Centre panel assembly

AB

Removal 

1.

Heater controller assembly

HEATER UNIT AND BLOWER ASSEMBLY

HEATER, AIR CONDITIONER AND VENTILATION

55-43

HEATER UNIT AND BLOWER ASSEMBLY

REMOVAL AND INSTALLATION

M1552020801098

WARNING

For removal and installation of the passenger's side air bag module, always observe the 
service procedures described in GROUP 52B, Driver’s Air Bag Module  to Passenger’s 
(Front) Air Bag Module .

Pre-removal and Post-installation Operation
• Refrigerant draining and Refilling (Refer to Charging and 

Discharging 

P.55-34

).

• Engine coolant replacement (Refer to GROUP 14, 

On-vehicle Service ).

• Dash panel heat protector (Refer to GROUP 42A, Loose 

Panel ).