Mitsubishi Outlander (2003+). Manual — part 540

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-55

NOTE: The low-pressure service valve should be
connected to the suction hose.

8. Start the engine.
9. Operate the air conditioner and set at the lowest

temperature (MAX. COOL).

10.Fix the engine speed at 1,500 r/min.
11.Tighten the handle of the adaptor valve (valve

open), and replenish refrigerant while checking
the quantity through the sight glass.

12.After replenishing is completed, turn the handle of

the adaptor valve all the way back (valve close),
and remove the quick joint.
NOTE: When there is remainder of refrigerant in
the service can, keep it for next use with the
charge value and the valve of the adaptor valve
being closed.

DISCHARGING SYSTEM

M1552013000086

Use the refrigerant recovery unit to discharge
refrigerant gas front the system.
NOTE: Refer to the Refrigerant Recovery and
Recycling Unit instruction Manual for operation of the
unit.

REFILLING OF OIL IN THE A/C SYSTEM

M1552020000055

Too little oil will provide inadequate compressor
lubrication and cause a compressor failure. Too
much oil will increase discharge air temperature.
When a compressor is installed at the factory, it
contains 120 mL <MSC90CA> or 140mL
<MSC105CA> of compressor oil. While the A/C
system is in operation, the oil is carried through the
entire system by the refrigerant. Some of this oil will
be trapped and retained in various parts of the
system.
When the following system components are
changed, it is necessary to add oil to the system to
replace the oil being removed with the component.

Compressor oil: SUN PAG 56
Quantity

Evaporator: 60 mL
Condenser: 15 mL
Flexible suction hose: 10 mL
Receiver: 10 mL

PERFORMANCE TEST

M1552001400333

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.

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.

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).
NOTE: The high-pressure service valve is on the
A/C pipe and the low-pressure service valve is on
the suction 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.

6. Start the engine.
7. Set the A/C controls as follows:

•

A/C switch: A/C

−

ON position

•

Mode selection: FACE position

•

Temperature control: MAXIMUM COOLING
position

•

Air selection: RECIRCULATION position

AC001388

Low-pressure
valve

High-pressure
valve

Gauge manifold

Charging
hose (red)

A

Sleeve

Charging
hose (blue)

Adaptor valve
(for low-
pressure)

Low-
pressure
service
valve

High-
pressure
service
valve

AB

Adaptor valve
(for high-
pressure)

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-56

•

Blower switch: "4" (Fast) position

8. Adjust engine speed to 1,500 r/min with A/C

clutch engaged.

9. Engine should be warmed up with doors and

windows opened.

10.Insert a thermometer in the centre air outlet and

operate the engine for 20 minutes.

NOTE: If the clutch cycles, take the reading before
the clutch disengages.
11.Note the discharge air temperature.

Performance Temperature Chart

REFRIGERANT LEAK REPAIR
PROCEDURE

M1552001500266

LOST CHARGE

If the system has lost all charge due to a leak:
1. Evacuate the system (Refer to

P.55A-55

).

2. Charge the system with approximately 550 g of

refrigerant.

3. Check for leaks.
4. Discharge the system.
5. Repair leaks.

CAUTION

Replacement filter-drier units must be sealed
while in storage. The drier used in these units will
saturate water quickly upon exposure to the
atmosphere. When installing a drier, have all
tools and supplies ready for quick assembly to
avoid keeping the system open any longer than
necessary.
6. Replace receiver drier.
7. Evacuate and charge system.

LOW CHARGE

If the system has not lost all of its refrigerant charge;
locate and repair all leaks. If it is necessary to
increase the system pressure to find the leak
(because of an especially low charge) add
refrigerant. If it is possible to repair the leak without
discharging the refrigerant system, use the
procedure for correcting low refrigerant level.

HANDLING TUBING AND FITTINGS

Kinks in the refrigerant tubing or sharp bends in the
refrigerant hose lines will greatly reduce the capacity
of the entire system. High pressures are produced in
the system when it is operating. Extreme care must
be exercised to make sure that all connections are
pressure tight. Dirt and moisture can enter the
system when it is opened for repair or replacement of
lines or components. The following precautions must
be observed. The system must be completely
discharged before opening any fitting of connection
in the refrigeration system. Open fittings with caution
even after the system has been discharged. If any
pressure is noticed as a fitting is loosened, allow
trapped pressure to bleed off very slowly.
Never attempt to rebend formed lines to fit. Use the
correct line for the installation you are servicing. A
good rule for the flexible hose lines is keep the radius
of all bends at least 10 times the diameter of the
hose.

AC200070AB

Thermometer

Garage ambient temperature

°

C

20

25

30

35

Discharge air temperature

°

C

8.0

−

11.0

12.0

−

16.0

17.0

−

21.0

22.5

−

27.5

Compressor high pressure kPa

740

−

840

950

−

1,050

1,160

−

1,300

1,360

−

1,550

Compressor low pressure kPa

150

−

190

190

−

240

240

−

300

300

−

375

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-57

Sharper bends will reduce the flow of refrigerant. The
flexible hose lines should be routed so that they are
at least 80 mm from the exhaust manifold. It is good
practice to inspect all flexible hose lines at least once
a year to make sure they are in good condition and
properly routed.
On standard plumbing fittings with O-rings, these
O-rings are not reusable.

COMPRESSOR NOISE CHECK

M1552008700261

You must first know the conditions when the noise
occurs. These conditions are: weather, vehicle
speed, in gear or neutral, engine temperature or any
other special conditions.
Noises that develop during A/C operation can often
be misleading. For example: what sounds like a
failed front bearing or connecting rod, may be
caused by loose bolts, nuts, mounting brackets, or a
loose clutch assembly. Verify accessory drive belt
tension (power steering or alternator).
Improper accessory drive belt tension can cause a
misleading noise when the compressor is engaged
and little or no noise when the compressor is
disengaged.
Drive belts are speed-sensitive. That is, at different
engine speeds, and depending upon belt tension,
belts can develop unusual noises that are often
mistaken for mechanical problems within the
compressor.

ADJUSTMENT

1. Select a quiet area for testing. Duplicate

conditions as much as possible. Switch the
compressor on and off several times to clearly
identify compressor noise. To duplicate high
ambient conditions (high head pressure), restrict
air flow through the condenser. Install a manifold
gauge set to make sure discharge pressure
doesn't exceed 2,070 kPa.

2. Tighten all compressor mounting bolts, clutch

mounting bolt, and compressor drive belt. Check
to assure clutch coil is tight (no rotation or
wobble).

3. Check refrigerant hoses for rubbing or

interference that can cause unusual noises.

4. Check refrigerant charge (Refer to

P.55A-51

).

5. Recheck compressor noise as in Step 1.
6. If noise still exists, loosen compressor mounting

bolts and retighten. Repeat Step 1.

7. If noise continues, replace compressor and repeat

Step 1.

POWER RELAY CHECK

M1552008800398

BLOWER RELAY CONTINUITY CHECK

Battery voltage

Tester
connection

Specified
condition

Not applied

4

−

5

Open circuit

•

Connect terminal
1 to the positive
battery terminal

•

Connect terminal
3 to the negative
battery terminal

4

−

5

Less than 2
ohms

AC212555

4

5

1 2 3

5

1

4

3

AB

Blower relay

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55A-58

A/C COMPRESSOR RELAY CONTINUITY
CHECK

FAN CONTROL RELAY CONTINUITY
CHECK

IDLE-UP OPERATION CHECK

M1552001600423

1. Before inspection and adjustment, set vehicle in

the following condition:

•

Engine coolant temperature: 80

−

90

°

C

•

Lamps, electric cooling fan and accessories: Set
to OFF

•

Transmission: Neutral ("N" or "P" for vehicles with
A/T)

•

Steering wheel: Straightforward

2. Check whether or not the idle speed is the

standard value.
Refer to GROUP 11A, On-vehicle Service

−

Basic

Idle Speed Adjustment

P.11A-11

. <2000>

Battery voltage

Tester
connection

Specified
condition

Not applied

1

−

4

Open circuit

•

Connect terminal
3 to the positive
battery terminal

•

Connect terminal
2 to the negative
battery terminal

1

−

4

Less than 2
ohms

AC309437

2

1

3

4

1

2

4

3

Front of
vehicle

AB

A/C compressor relay

Battery voltage

Tester
connection

Specified
condition

Not applied

2

−

4

Open circuit

•

Connect terminal
1 to the positive
battery terminal

•

Connect terminal
3 to the negative
battery terminal

2

−

4

Less than 2
ohms

AC309437AC

3

1

4

2

Fan control relay

2

1

4

3