Mitsubishi Evolution X. Manual — part 1263

GENERAL INFORMATION

TSB Revision

HEATER, AIR CONDITIONING AND VENTILATION

55-3

GENERAL INFORMATION

M1552023500015

The blower, heater, and evaporator have been inte-
grated with the heater and A/C system to achieve
greater fan power and noise reduction.

SAFETY PRECAUTIONS

WARNING

Wear safety goggles and gloves when servic-
ing the refrigeration system to prevent
severe damage to eyes and hands.

Because R-134a refrigerant is a hydro fluorocarbon
(HFC) which contains hydrogen atoms in place of
chlorine atoms, it will not cause damage to the ozone
layer.
Ozone filters out harmful radiation from the sun. To
assist in protecting the ozone layer, Mitsubishi
Motors Corporation recommends an R-134a refriger-
ant recycling device.
Refrigerant R-134a is transparent and colorless in
both the liquid and vapor state. Since it has a boiling
point of

−29.8° C (−21.64° F) at atmospheric pressure,

it will be a vapor at all normal temperatures and pres-
sures. The vapor is heavier than air, non-flammable,
and non-explosive. The following precautions must
be observed when handling R-134a.

WARNING

Do not heat R-134a above 40

°

C (104.0

°

F) or

it may catch fire and explode.

R-134a evaporates so rapidly at normal atmospheric
pressures and temperatures that it tends to freeze
anything it contacts. For this reason, extreme care
must be taken to prevent any liquid refrigerant from
contacting the skin and especially the eyes. Always
wear safety goggles when servicing the refrigeration
part of the A/C system. Keep a bottle of sterile min-
eral oil handy when working on the refrigeration sys-
tem.
1. Should any liquid refrigerant get into your eyes,

use a few drops of mineral oil to wash them out.
R-134a is rapidly absorbed by the oil.

2. Next, splash your eyes with plenty of cold water.
3. Call your doctor immediately even if irritation has

ceased.

CAUTION

Keep R-134a containers upright when charging
the system.
In most instances, moderate heat is required to bring
the pressure of the refrigerant in its container above
the pressure of the system when charging or adding
refrigerant.
A bucket or large pan of hot water not over 40

° C

(104.0

° F) is all the heat required for this purpose. Do

not heat the refrigerant container with a blow torch or
any other means that would raise temperature and
pressure above this temperature. Do not weld or
steam-clean on or near the system components or
refrigerant lines.

WARNING

The leak detector for R-134a should be used
to check for refrigerant gas leaks.

CAUTION

Do not allow liquid refrigerant to touch bright
metal or it will be stained.
When metering R-134a into the refrigeration system,
keep the supply tank or cans in an upright position. If
the refrigerant container is on its side or upside
down, liquid refrigerant will enter the system and
damage the compressor.
Refrigerant will tarnish bright metal and chrome sur-
faces, and in combination with moisture can severely
corrode all metal surfaces.

OPERATION

.

CONDENSER FAN AND RADIATOR FAN
CONTROL

The ECM judges the required revolution speed of
radiator fan motor and condenser fan motor using
the input signals transmitted from A/C switch, sec-
ondary pulley speed sensor <CVT> or vehicle speed
sensor (VSS) <M/T> and engine coolant temperature
sensor.

.

Item

Specification

Heater control assembly

Dial type

Compressor mode

MSC90CAS

Compressor type

Scroll type

Refrigerant and quantity g (oz)

R-134a (HFC-134a), 480

− 520 (16.9 − 18.3)

GENERAL INFORMATION

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HEATER, AIR CONDITIONING AND VENTILATION

55-4

COMPRESSOR CONTROL

When operating the A/C switch

• The air thermo sensor, which senses the temper-

ature of the air flowing out of the evaporator,
deactivates the compressor at 1

° C (33.8° F) or

below.

• The dual pressure switch turns OFF when the

refrigerant pressure becomes excessively high or
low, thus protecting the compressor circuit (See
Table below).

• When the air thermo sensor is activated, and the

ignition switch, blower switch, and A/C switch are
ON, the A/C compressor clutch relay is ener-
gized.

When operating the mode selection dial

• The A/C will work when the mode selection dial is

set to the "Defroster" or "Defroster/foot" position,
or the temperature control dial is set to the "MAX
A/C" position. In other dial positions, when the
A/C switch is turned on, the A/C will work.

A/C Compressor Clutch Relay ON Conditions

Ignition switch (IG2)

ON

NOTE: A/C compressor clutch relay is
de-energized when any one switch, sensor
or control unit shown on the left turns off.
NOTE: The components marked by

*

communicate with the ECM. If the air thermo
sensor detects a temperature of 1

°

C

(33.8

°

F), the A/C-ECU will turn off the A/C

compressor clutch relay.

Blower switch

ON

A/C switch, mode selection dial defroster,
defroster/foot position or temperature control MAX
A/C

ON

Air thermo sensor

*

Pressure detected
by A/C pressure
sensor

2.94 MPa (427psi) or less (If
the refrigerant pressure
exceeds 2.94 MPa (427psi),
A/C compressor clutch relay is
not ON condition until the
refrigerant pressure has been
measured up to 2.35 MPa
(341psi) a or less.)

ON

0.19 MPa (27psi) or more (If
the refrigerant pressure falls
short of 0.19 MPa (27psi), A/C
compressor clutch relay is not
ON condition until the
refrigerant pressure has been
measured up to 0.22 MPa
(32psi) or more.)

A/C compressor clutch relay driving transistor (within
powertrain control module)

ON

FASTENER TIGHTENING SPECIFICATIONS

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HEATER, AIR CONDITIONING AND VENTILATION

55-5

FASTENER TIGHTENING SPECIFICATIONS

M1552012100358

GENERAL SPECIFICATIONS

M1552000200336

SERVICE SPECIFICATIONS

M1552000300601

LUBRICANTS

M1552000400567

Item

Specification

Armature plate mounting bolt

16

± 1 N⋅ m (12 ± 1 ft-lb)

Discharge flexible hose mounting bolt (compressor side)

25

± 4 N⋅ m (18 ± 3 ft-lb)

Discharge flexible hose mounting nut (condenser side)

4.9

± 0.9 N⋅ m (43 ± 8 in-lb)

Connection between the liquid pipe A and B

13

± 1 N⋅ m (115 ± 9 in-lb)

Liquid pipe A mounting bolt (condenser side)

4.9

± 0.9 N⋅ m (43 ± 8 in-lb)

Suction flexible hose mounting bolt (compressor side)

25

± 4 N⋅ m (18 ± 3 ft-lb)

Suction flexible hose mounting nut (heater unit side)

4.9

± 0.9 N⋅ m (43 ± 8 in-lb)

Front deck crossmember mounting bolt (left side)

23

± 6 N⋅ m (17 ± 4 ft-lb)

Front deck crossmember mounting bolt (right side)

20

± 5 N⋅ m (15 ± 3 ft-lb)

Front deck crossmember mounting bolt (front deck side)

20

± 5 N⋅ m (15 ± 3 ft-lb)

Item

Standard value

Heater control assembly

Rotary type

A/C switch

Push-button type

Compressor model, type

MSC90CAS, Scroll type

Refrigerant

Type

R134a (HFC-134a)

Amount g (oz)

480

− 520 (16.9 − 18.3)

Item

Standard value

Idle speed r/min

700

± 50

Idle-up speed r/min

800

± 50

Air gap (A/C compressor clutch) mm (in)

0.3

− 0.5 (0.012 − 0.020)

Item

Specified lubricant

Quantity

Each connection of refrigerant line

SUN PAG 56

As required

Compressor refrigerant unit lubricant cm

3

(fl.oz)

SUN PAG 56

80

− 100 (2.7 − 3.4)

SERVICE PRECAUTIONS

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HEATER, AIR CONDITIONING AND VENTILATION

55-6

SERVICE PRECAUTIONS

CAUTION LABEL

M1552017400387

The refrigerant gas caution label must be affixed in the location
shown in the figure on the left. Follow the instructions on the
label when servicing.

AUTO A/C DIAGNOSIS

INTRODUCTION TO HEATER, A/C AND VENTILATION DIAGNOSIS

M1552012200418

Air is drawn into the heater assembly from either the
outside, or from the inside of the passenger cabin if
DEFROST, maximum cooling or RECIRCULATION
are selected. The air is then forced through the evap-
orator where heat is removed, cooling and de-humid-
ifying the air. Depending on the temperature
selected, a portion of this air is then forced through
the heater core to achieve the selected discharge
temperature.

If the system does not cool properly, look for a prob-
lem with the refrigerant, blower or air distribution sys-
tems. If the system does not heat properly, look for a
problem with the coolant, blower or air distribution
systems. In either case all system fuses, circuit
breaker and relays should be checked.

HEATER, A/C AND VENTILATION DIAGNOSTIC TROUBLESHOOTING STRATEGY

M1552009600494

Use these steps to plan your diagnostic strategy. If
you follow them carefully, you will be sure that you
have exhausted most of the possible ways to find a
heater, A/C and ventilation fault.
1. Gather information from the customer.

2. Verify that the condition described by the

customer exists.

3. Find the malfunction by following the Symptom

Chart.

4. Verify that the malfunction is eliminated.

No.

Content

1

Name of A/C manufacturer

2

Amount of refrigerant

3

Name of compressor oil

AC708364AB

AC200079

1

2

3

3

2

AC