Mitsubishi Outlander GS45X. Manual — part 994

GENERAL INFORMATION

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HEATER, AIR CONDITIONING AND VENTILATION

55A-3

GENERAL INFORMATION

M1552023500071

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, output
shaft speed sensor and engine coolant temperature
sensor.

.

Item

Specification

Heater control assembly

Dial type

Compressor

QS90

Compressor model

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

55A-4

COMPRESSOR CONTROL

When operating the A/C switch

• The fin thermo sensor, which senses the temper-

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

°C

(33.8

°F) or below.

• The A/C pressure sensor 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 automatically the mode

selection dial is set to the "Defroster" or
"Defroster/foot" position, or the temperature con-
trol dial is set to the "MAXIMUM 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

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
3

°

C (37.4

°

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

the A/C compressor clutch relay.

Blower speed selection dial

ON

A/C switch

ON

Mode selection dial

defroster

Temperature control dial

MAXIMUM
A/C

Air thermo sensor

*

Pressure detected
by A/C pressure
sensor

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

ON

GENERAL SPECIFICATIONS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-5

GENERAL SPECIFICATIONS

M1552000200358

SERVICE SPECIFICATIONS

M1552000300720

LUBRICANTS

M1552000400608

SEALANT

M1552023400182

Item

Manual air conditioning

Heater control

Dial type

A/C switch

Push-button type

Compressor

QS90 (Scroll type)

Refrigerant

Type

R134a (HFC-134a)

Amount g (oz)

480 - 520 (16.9 - 18.3)

Item

Standard value

Idle speed r/min

2.4L

650

± 100

3.0L

600

± 100

Idle-up speed r/min

2.4 L

A/C at low load

700

± 50

A/C at high load

800

± 50

3.0 L

760

± 50

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

0.25

− 0.45 (0.010 − 0.017)

Cooling temperature switch

Less than 2 ohms slightly below 135

°C (275°F)

No continuity

135

°C (275°F) or more [up to 120°C (248°F)

when temperature drops]

Item

Specified lubricant

Quantity

Each connection of refrigerant line

SUN PAG 56 or S10X

As required

Compressor refrigerant unit lubricant cm

3

(fl.oz)

SUN PAG 56 or S10X

70 (2.4)

Item

Specified sealant

Quantity

A/C refrigerant temperature switch

KE-347W

As required

SERVICE PRECAUTIONS

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HEATER, AIR CONDITIONING AND VENTILATION

55A-6

SERVICE PRECAUTIONS

CAUTION LABELS

M1552017400406

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

MANUAL A/C DIAGNOSIS

INTRODUCTION TO HEATER, AIR CONDITIONING AND VENTILATION DIAGNOSIS

M1552012200429

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, AIR CONDITIONING AND VENTILATION DIAGNOSTIC TROUBLESHOOTING
STRATEGY

M1552009600502

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, air conditioning 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. (Refer to

P.55B-12

)

4. Verify that the malfunction is eliminated.

No.

Contents

1

Name of A/C manufacturer

2

Amount of refrigerant

3

Name of compressor oil

4

Parts number

AC702365AB

AC200079

1

2

3

3

2

AB

4