Mitsubishi Pajero Pinin. Manual — part 363
HEATER, AIR CONDITIONER AND VENTILATION
–
General Information
55-3
GENERAL INFORMATION
The heater system uses a two-way-flow full-air-mix
system that features high performance and low
operating noise, and includes an independent face
air blowing function. The A/C system is basically
the same as the conventional system, but a new
refrigerant system has been adopted as a response
to restrictions on the use of chlorofluorocarbons.
In addition, an air purifier which carries out fine
A/C control has been included.
Items
Specifications
Heater unit
Type
Two-way-flow full-air-mix system
Heater control assembly
Dial type
Compressor
Model
Scroll type
<KC 50AG or KC 50G>
Dual pressure switch
kPa
High-pressure switch
ON
→
OFF: 2,650, OFF
→
ON: 2,050
kPa
Low-pressure switch
ON
→
OFF: 176, OFF
→
ON: 186
Refrigerant and quantity g
R-134a (HFC-134a)
Approx. 550 – 590 (R.H.D.)
Approx. 600 – 640 (L.H.D.)
SAFETY PRECAUTIONS
Because R-134a refrigerant is a hydrofluorocarbon
(HFC) which contains hydrogen atoms in place of
chlorine atoms, it will not cause damage to the ozone
layer.
Refrigerant R-134a is transparent and colourless
in both the liquid and vapour state. Since it has
a boiling point of – 29.8
_
C, at atmospheric pressure,
it will be a vapour at all normal temperatures and
pressures. The vapour is heavier than air,
non-flammable, and nonexplosive. The following
precautions must be observed when handling
R-134a.
Caution
Wear safety goggles when servicing the
refrigeration system.
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
mineral oil handy when working on the refrigeration
system. Should any liquid refrigerant get into the
eyes, use a few drops of mineral oil to wash them
out. R-134a is rapidly absorbed by the oil. Next
splash the eyes with plenty of cold water. Call your
doctor immediately even though irritation has
ceased after treatment.
Caution
Do not heat R-134a above 40
_
C
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
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.
Caution
Keep R-134a containers upright when charging
the system.
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.
Caution
1.
The leak detector for R-134a should be used
to check for refrigerant gas leaks.
2.
Do not allow liquid refrigerant to touch bright
metal.
Refrigerant will tarnish bright metal and chrome
surfaces, and in combination with moisture can
severely corrode all metal surfaces.
HEATER, AIR CONDITIONER AND VENTILATION
–
Service Specifications/Lubricants/Special Tools
55-4
SERVICE SPECIFICATIONS
Items
Standard value
Idle speed r/min
600
±
50
Idle up speed r/min
A/C at low load 700
±
50
A/C at high load 800
±
50
Resistor (for blower motor)
Ω
LO: 2.3, ML:1.0, MH: 0.3
Air gap (Magnetic clutch)
0.25 – 0.55
LUBRICANTS
Items
Specified lubricants
Quantity
Each connection of refrigerant line
ZXL 200PG
As required
Compressor refrigerant unit lubricant m
ȏ
ZXL 200PG
130 – 170 <KC 50AG>
160 – 200 <KC 50G>
SPECIAL TOOLS
Tool
Number
Name
Use
MB991367
Special spanner
Removal and installation of armature mounting
nut of compressor
MB991386
Pin
HEATER, AIR CONDITIONER AND VENTILATION
–
Troubleshooting
55-5
TROUBLESHOOTING
TROUBLESHOOTING PROCEDURES
Trouble symptom
Problem cause
Remedy
Reference
page
When the ignition
switch is “ON”
Fuse is defective
Replace the fuse
–
switch is “ON”,
the A/C does not
operate
Harness or connector is defective
Repair the harness or connector
–
operate
A/C compressor relay is defective
Replace the A/C compressor
relay
55-17
A/C compressor magnetic clutch is defective
Replace the armature plate, rotor
or clutch coil
55-28
Refrigerant leak or overfilling of refrigerant
Replenish the refrigerant, repair
the leak or take out some of the
refrigerant
55-16
Dual pressure switch is defective
Replace the dual pressure switch
55-32
A/C switch is defective
Replace the blower switch as-
sembly
55-21
Blower switch is defective
Replace the blower switch as-
sembly
55-21
Air thermosensor is defective
Replace the air thermosensor
55-22
Engine-ECU is defective
Replace the engine-ECU
–
When the A/C is
operating, tem-
perature
inside
Refrigerant leak
Replenish the refrigerant and
repair the leak
55-16
perature
inside
the passenger
compartment
Dual pressure switch is defective
Replace the dual pressure switch
55-32
compartment
doesn’t decrease
(cool air is not
emitted)
Fan controller is defective
Replace the fan controller
GROUP14
– Radiator
emitted)
Air thermosensor is defective
Replace the air thermosensor
55-22
Engine-ECU is defective
Replace the engine-ECU
–
Blower fan and
motor do not turn
Fuse is defective
Replace the fuse
–
motor do not turn
Harness or connector is defective
Repair the harness or connector
–
Blower relay is defective
Replace the blower relay
55-17
Blower fan and motor are defective
Replace the blower fan and
motor
55-23
Resistor (for blower motor) is defective
Replace the resistor
55-22
Blower switch is defective
Replace the blower switch as-
sembly
55-26
HEATER, AIR CONDITIONER AND VENTILATION
–
Troubleshooting
55-6
Trouble symptom
Reference
page
Remedy
Problem cause
Blower fan and
motor do not stop
Harness or connector is defective
Repair the harness or connector
–
motor do not stop
turning
Blower switch is defective
Replace the blower switch as-
sembly
55-21
Blower relay is defective
Replace the blower relay
55-17
When the A/C is
operating
con-
Fuse is defective
Replace the fuse
–
operating con-
denser fan or ra-
diator fan does
Harness or connector is defective
Repair the harness or connector
–
diator fan does
not turn
Condenser fan motor is defective
Replace the condenser fan motor
55-30
Radiator fan motor is defective
Replace the radiator fan motor
GROUP14
– Radiator
Engine-ECU is defective
Replace the engine-ECU
–
Inside and out-
side changeover
Harness or connector is defective
Repair the harness or connector
–
side changeover
does not operate
Inside and outside changeover switch is
defective
Replace the blower switch as-
sembly
55-21
Inside and outside changeover damper motor
is defective
Replace the inside and outside
changeover damper motor
55-25
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