Mitsubishi Montero Sport (2004+). Manual — part 600

ON-VEHICLE SERVICE

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-27

ON-VEHICLE SERVICE

REFRIGERANT LEVEL TEST

M1552008400271

Use the refrigerant recovery station to remove all of the refrig-
erant, and then calculate the amount of the refrigerant and
charge it.

A/C COMPRESSOR CLUTCH TEST

M1552019900076

1. Disconnect the A/C compressor clutch connector to the A/C

compressor clutch.

2. Connect positive battery voltage directly to the connector for

the A/C compressor clutch.

3. If the A/C compressor clutch is normal, there will be a "click."

If the pulley and armature do not make contact ("click"),
there is a malfunction.

RECEIVER DRIER TEST

M1552008600220

Turn the A/C on. Check the temperature by touching the
receiver drier outlet and inlet pipes. If there is a difference in the
temperatures of the two pipes, the receiver assembly is
restricted. Replace the receiver assembly.

DUAL PRESSURE SWITCH CHECK

M1552010400364

1. Remove the dual pressure switch connector and connect

the high/low pressure side terminals located on the harness
side as shown in the illustration.

2. Install a gauge manifold to the high-pressure side service

valve of the refrigerant line. (Refer to

P.55-29

.)

3. When the high/low pressure sides of the dual pressure

switch are at operation pressure (ON) and there is continuity
between the respective terminals, then the condition is
normal. If there is no continuity, replace the switch.

AC002842

A/C COMPRESSOR CLUTCH

CONNECTOR

AC

ITEM

FROM OFF TO ON FROM ON TO OFF

Low-pressure
side kPa (psi)

221

± 27 (32.1 ±

3.9)

196

± 20 (28.4 ± 2.9)

High-pressure
side kPa (psi)

2,354

± 200 (341.4

± 29)

2,942

± 200 (426.7 ±

29)

A003021

HIGH/LOW
PRESSURE SIDE

LOW-PRESSURE
SIDE

HIGH-PRESSURE
SIDE

ON

OFF

ON

OFF

AC

196 ± 20
(28.4 ± 2.9)

221 ± 27
(32.1 ± 3.9)

kPa (psi)

2942 ± 200
(426.7 ± 29)

2354 ± 200
(341.4 ± 29)

ON-VEHICLE SERVICE

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-28

COMPRESSOR DRIVE BELT ADJUSTMENT

M1552001000249

Refer to GROUP 00, Maintenance Service

− Drive Belts

P.00-46

.

CHARGING

M1552001200254

Use the refrigerant recovery station to charge the refrigerant.

METHOD BY USING REFRIGERANT RECOVERY
AND RECYCLING UNIT

Using the refrigerant recovery and recycling unit, refill the
refrigerant.
NOTE: Refer to the Refrigerant Recovery and Recycling Unit
Instruction Manual for operation of the unit.

DISCHARGING SYSTEM

Use the refrigerant recovery unit to discharge refrigerant gas
from 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

Too little oil will provide inadequate compressor lubrication and
cause a compressor failure. Too much oil will increase dis-
charge air temperature.
When a compressor is installed at the factory, it contains 170
cm

3

(5.7 floz) of refrigerant oil. While the A/C system is in oper-

ation, the oil is carried through the entire system by the refriger-
ant. Some of this oil will be trapped and retained in various
parts of the system.
When the following system components are replaced, it is nec-
essary to add oil to the system to replace the oil being removed
with the component.

Compressor oil: SUN PAG 56
Quantity:

• Evaporator: 20 cm

3

(0.7 floz)

• Condenser: 70 cm

3

(2.4 floz)

• Suction hose: 10 cm

3

(0.3 floz)

• Receiver: 10 cm

3

(0.3 floz)

ON-VEHICLE SERVICE

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-29

PERFORMANCE TEST

M1552001400418

1. The vehicle 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.

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).

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.

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

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

• Blower switch: HI position

8. Adjust engine speed to 1,000 r/min with A/C compressor

clutch engaged.

9. Engine should be warmed up with doors and windows

closed.

10.Insert the thermistor-type thermometer into the discharge

port shown left and measure the discharge air temperature.

11.Note the discharge air temperature.

NOTE: If the clutch cycles, take the reading before the
clutch disengages.

AC001388

LOW-PRESSURE
VALVE

HIGH-PRESSURE
VALVE

GAUGE MANIFOLD

CHARGING
HOSE (RED)

A

SLEEVE

CHARGING
HOSE (BLUE)

ADAPTOR
VALVE
(FOR
LOW-PRES-
SURE)

ADAPTOR
VALVE
(FOR HIGH-
PRESSURE)

LOW-
PRESSURE
SERVICE
VALVE

HIGH-
PRESSURE
SERVICE
VALVE

AB

AC003023AB

THERMOMETER

ON-VEHICLE SERVICE

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-30

Performance Temperature Chart

REFRIGERANT LEAK REPAIR

M1552001500329

LOST CHARGE

If the system has lost all charge due to a leak:
1. Evacuate the system. (See procedure.)
2. Charge the system with 0.453 kg (1 pound) 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 refriger-
ant. If it is possible to repair the leak without dis-
charging 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 sys-
tem when it is opened for repair or replacement of
lines or components. The following precautions must
be observed. The system must be completely dis-
charged 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.
Sharper bends will reduce the flow of refrigerant. The
flexible hose lines should be routed so that they are
at least 80 mm (3.1 inches) from the exhaust mani-
fold. 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.

GARAGE AMBIENT
TEMPERATURE

°C (°F)

20 (68)

25 (77)

35 (95)

40 (104)

Discharge air
temperature

°C (°F)

4.9

− 6.5

(40.1

− 43.7)

5.0

− 7. 0

(41.0

− 44.6)

7.2

− 9.2 (45.0 −

48.6)

8.5

− 10.5 (47.3 −

50.9)

Compressor high
pressure kPa (psi)

830

− 1,130 (120 −

164)

1,000

− 1,300 (145

−189)

1,200

− 1,500 (174

− 218)

1,550

− 1850 (225

− 268)

Compressor low
pressure kPa (psi)

95

− 195 (14 − 28) 105 − 209 (15 −

30)

125

− 229 (18 −

33)

145

− 245 (21 −

36)