Mitsubishi Lancer Evolution IX. Manual — part 558

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-105

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 posi-

tion

• Air selection: RECIRCULATION position

• Blower switch: "4" (Fast) position

8. Keep engine speed to idling speed with A/C clutch

engaged.

9. Engine should be warmed up with doors and all

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

M1552001500385

LOST CHARGE

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

P.55-104

).

2. Charge the system with approximately 480

− 520

g of refrigerant.

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

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)

AC304576

Thermometer

AB

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

55-106

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 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

M1552008700379

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 disen-
gaged.
Drive belts are speed-sensitive. That is, at different
engine speeds, and depending upon belt tension,
belts can develop unusual noises that are often mis-
taken for mechanical problems within the compres-
sor.

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.55-104

).

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.

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONER AND VENTILATION

55-107

POWER RELAY CHECK

M1552008800428

BLOWER RELAY CONTINUITY CHECK

A/C COMPRESSOR RELAY, CON-
DENSER FAN RELAY (LO) AND (HI) CON-
TINUITY CHECK

IDLE-UP OPERATION CHECK

M1552001600683

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

• Steering wheel: Straightforward

2. Check whether or not the idle speed is the

standard value. Refer to GROUP 13A, On-vehicle
Service

− Basic Idle Speed Adjustment

P.13A-396

.

Standard value: 850

± 50 r/min

3. When the A/C is running after turning the A/C

switch to ON, and the blower switch to the 3(MH)
or 4(HI) position, check to be sure that the idle up
speed is at the standard value.

Standard value: 850

± 50 r/min

NOTE: It is not necessary to make an adjustment,
because the idling speed is automatically
adjusted by the ISC system. If, however, a devia-
tion from the standard value occurs for some rea-
son, check the ISC system.

Battery voltage Tester

connection

Specified
condition

Not applied

4

− 5

Open circuit

• Connect

terminal 3 to
the positive
battery
terminal

• Connect

terminal 1 to
the negative
battery
terminal

4

− 5

Less than 2
ohms

AC310514AB

Blower relay

5

4

3

1

1 2 3

5

4

Battery voltage Tester

connection

Specified
condition

Not applied

1

− 4

Open circuit

• Connect

terminal 2 to
the positive
battery
terminal

• Connect

terminal 3 to
the negative
battery
terminal

1

− 4

Less than 2
ohms

AC310515

A/C compressor relay

Condenser fan relay (HI)

Condenser fan relay (LO)

AB

1

4

3

2

2

4

X

1

3

Front of
vehicle

HEATER CONTROL ASSEMBLY AND A/C SWITCH

HEATER, AIR CONDITIONER AND VENTILATION

55-108

CLEAN AIR FILTER REPLACEMENT
PROCEDURE

M1552020100096

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

Instrument Panel

P.52A-2

).

2. Remove the two screws as shown, and replace

the clean air filter.

3. Install the glove box.

HEATER CONTROL ASSEMBLY AND A/C SWITCH

REMOVAL AND INSTALLATION

M1552002400659

AC309643

Clean air filter

AC

AC504841

1

2

2

4

5

2

3

4

5

AB

Removal steps

1.

Centre lower case (Refer to
GROUP 52A, Instrument panel
assembly

P.52A-2

)

2.

Knob

3.

Automatic A/C control panel
(A/C-ECU)

4.

Bracket

Removal steps (Continued)