2006 MITSUBISHI COLT heater

GROUP 55
HEATER, AIR
CONDITIONER AND
VENTILATION
CONTENTS
GENERAL INFORMATIO N . . . . . . . .55-2
HEATER UNIT . . . . . . . . . . . . . . . . . .55-5
HEATER CONTROL . . . . . . . . . . . . .55-7
A/C-ECU . . . . . . . . . . . . . . . . . . . . . . .55-8
DUCTS . . . . . . . . . . . . . . . . . . . . . . . .55-11
VENTILATION SYSTEM . . . . . . . . . . .55-12

GENERAL INFORMATION
HEATER, AIR CONDITIONER AND VENTILATION55-2
GENERAL INFORMATION
M2551000100759
For the heater and A/C system, the heater, the
blower and the cooling unit are integrated as one unit
to reduce weight and size. For A/C system, the man
-
ual A/C has been adopted.
FEATURES
IMPROVEMENTS IN COMFORT
•Adoption of low noise, large air volume heater
and A/C system
•Adoption of smaller air intake box for larger pas-
senger leg space.
•Optimising the areas of the outside air induction
hole and the air outlet improves ventilation per
-
formance as well as the quietness of the room
•Adoption of clean air filter with deodorant function
for cleaner air in the compartment.
IMPROVEMENTS IN OPERATION
PERFORMANCE
•Inside/outside air selection switch has been
changed to a pushbutton switch.
•Improved operation ability by the enlarged tab on
the dial knob
•Air amount and temperature only are controlled
automatically for easier operation. automatic A/C>
RELIABLE VISUAL FIELD
(IMPROVEMENT IN SAFETY)
•Current type defroster nozzle has been adopted
to improve defogging performance (Shortens
windshield fogging time).
•Defroster vents have been integrated to secure
better defogging pattern.
•Black coin drop prevention ribs are used on the
defroster to prevent its reflection on the wind
-
shield, providing sufficient field of vision for safety
IMPROVEMENTS IN FUEL ECONOMY
•Wider condenser area reduces load to the A/C
and improves fuel consumption.
•Energy conservation control using outside air
temperature sensor is adopted for vehicles with
manual A/C as well.
•A small-size, highly-efficient compressor has
been adopted.
•Simpler wiring and weight reduction are achieved
by installation of CAN communication system
GLOBAL ENVIRONMENT PROTECTION
Adoption of HFC134a for refrigerant.
IMPROVEMENTS IN SERVICE QUALITY
•Reduction of refrigerant gas leakage and
improvement in serviceability by incorporating
condenser and receiver
•The layout of refrigerant line for better workability
is adopted.
RESPONSIBILITY IMPROVEMENT
Reliable information transmission is achieved by
connecting A/C-ECU and each ECU via CAN com
-
munication.

GENERAL INFORMATION
HEATER, AIR CONDITIONER AND VENTILATION55-3
SPECIFICATION
ItemSpecification
Heater unit typeTwo-layer full blow air mix method
Heater control typeDial type
A/C switch typePush button type
Compressor typeMSC60CA
RefrigerantTy p eHFC134a
Charge quantity g550 ± 20
PART MANUFACTURER
ItemManufacturer
A/C controller amplifierMitsubishi Heavy Industries Ltd.
Liquid pipe A
Liquid pipe B
Discharge flexible hose
Suction flexible hose
Compressor
Heater control panelAnsei Co., Ltd.
Heater unitDenso Corporation
Air intake box
CondenserZexel Valeo Climate Control
Corporation

GENERAL INFORMATION
HEATER, AIR CONDITIONER AND VENTILATION55-4
CONSTRUCTION DIAGRAM
AC207081AG
A/C pressure sensor
AC206840Ambient temperature sensorAF
AC206841

AI
Photo sensor
AC207058
Interior temperature sensor
AI

AC206029AE
Heater unit
Liquid pipe
Flexible suction hose
Discharge flexible hose
Receiver Compressor Condenser Air intake box

HEATER UNIT
HEATER, AIR CONDITIONER AND VENTILATION55-5
HEATER UNIT
M2551000800219
COOLING UNIT AND HEATER UNIT
AC313940AB
Air intake boxResistor
(Power transistor)*Heater unit
Mode selection
damper
Blower motor
Air mixing
damper motor*
Mode selection
damper
Heater core
Air mixing damper
Evaporator
(Cooling unit)
Outside/Inside air
selection damper
Outside/Inside air selection
damper motor
Clean air filter
NO TE: *: Indicat e s vehicles with a u tomatic A/C.
The following co oling unit and heate r unit have been
inst
alled for grea ter fan p o wer , red u ced noise, an d
imp
r oved A/C p e rformance .
•The h eat er unit int egra t es t he hea ter , b l owe r , and
co
oling unit for re duce d weigh t and size.
•Smaller air int a ke b o x ha s be en ado pted fo r
la
rger p a ssenge r leg sp ace .
•The case has a crush able structure so as to be
crushe
d when a collision occurs, t hereby prote c t
-
ing p a ssenger s from imp a ct an d improving t he
safety
.
•Rehea ting of heat er is minimise d to red u ce A/ C
lo
ad, the r eby imp r oving fue l co nsumption.
•Clean air filter with deod orant function is inst alled
for h
i ghe r comfort.

HEATER UNIT
HEATER, AIR CONDITIONER AND VENTILATION55-6
OPERATION
AC314092AB
Front defrosterSide defroster
Side defroster
Side air outlet
Centre air outlet Side air outlet
Air intake duct
Blower motor
Outside/Inside air
selection damper Air mixing damper
Evaporator Heater coreFoot duct
Mode selection
damper

HEATER CONTROL
HEATER, AIR CONDITIONER AND VENTILATION55-7
HEATER CONTROL
M2551000900346
HEATER CONTROLLER
AC206985AE

Mode selection
damper control knob Blower
selection knob
Temperature
adjustment knob
Mode selection
damper control knobBlower
selection knob
Temperature
adjustment knob
Outside/inside air
selection switch
A/C switch
Rear window defogger
switch
Outside/inside air
selection switch
A/C switch
Rear window defogger
switch
The hea
ter control of fe rs the following f eatures for
imp
r oved appea rance and o perationabilit y and eas
-
ier visual recognition .
•Improved appea ran c e by in corpo r ati ng th e cen t re
p
anel
•Larg e rot a ry contro l to impr ove contro llab ility
•Outs ide / inside a i r selection switch has bee n
ch
anged to a p u shb u tton switch for ea sie r opera
-
tion .
•Easier visu al recogn ition throug h larg er display
la
bels
•Graphic display is ad ded to the mode label to
encourag
e simult aneo us usa ge o f the out side air
mode when
the de froste r is used .
•Adoption o f rear win dow defo gger switch with
timer of
20-minute range.

A/C-ECU
HEATER, AIR CONDITIONER AND VENTILATION55-8
A/C-ECU
M2551001200179
CONTROL SYSTEM
The manual and automatic A/Cs have the following
control functions.
ControlManual A/CAutomatic A/C
Automatic wind temperature change controlApplicableApplicable
Automatic outside/inside air selection controlApplicableApplicable
Idle-up controlApplicableApplicable
Cooling fun load controlApplicableApplicable
Cooling controlApplicableApplicable
Detection control for refrigerant leaksApplicableApplicable
MAX A/C controlNot applicableApplicable
Estimation control for compressor torqueApplicableApplicable
Defroster linked controlNot applicableApplicable
AUTOMATIC CHANGE CONTROL OF
BLOW WIND TEMPERATURE
(COMPRESSOR
ENERGY-CONSERVATION CONTROL)
Optimum ON/OFF control of the compressor is
achieved according to the outside/inside air mode,
air temperature (air temperature sensor), and insula
-
tion.
OUTSIDE/INSIDE AIR AUTO SWITCHING
CONTROL
When the A/C is turned on in high ambient tempera-
ture, the recirculation function is automatically acti-
vated to cool down the passenger compartment and
improve fuel consumption.
COOLING FUN LOAD CONTROL
Depending on the A/C load, the cooling fan cycle
time is controlled and the exterior noise in the inter
-
mediary stage is decreased. Also, the load of the
alternator is decreased to improve the fuel economy.
COOLING CONTROL
If air temperature is high, the CVT rotates at a high
speed to prevent deterioration in cooling perform
-
ance.
DETECTION CONTROL FOR
REFRIGERANT LEAKS
When it is judged from the air temperature (air tem-
perature sensor) and the refrigerant pressure (A/C
pressure sensor) that the refrigerant amount is the
specified value or less, or the refrigerant pressure is
abnormal, the compressor is forced to be cut off to
protect the A/C system.
MAX A/C CONTROL AUTOMATIC A/C>
When MAX COOL position is set, automatically the
mode is changed to the inside air mode before the
A/C is turned ON, thereby facilitating the operation
for obtaining maximum cooling performance.
ESTIMATION CONTROL FOR
COMPRESSOR TORQUE
Communication between the engine⋅CVT-ECU and
A/C-ECU is made to control the engine according to
the compressor torque for higher drivability and
reduction in fuel consumption.
FORCIBLE DEFROSTER CONTROL

When the defroster vents are selected, the A/C is
automatically turned ON. At this time, the out
-
side/inside air selection damper is operated to the
fresh-air position to defrost the windshield glass
quickly.