Mitsubishi Galant (2004+). Manual - part 1704

 

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Mitsubishi Galant (2004+). Manual - part 1704

 

 

HEATER AND AIR CONDITIONING SYSTEM

HEATER, AIR CONDITIONING AND VENTILATION

55-5

HEATER UNIT ASSEMBLY

The following features provide greater fan power, 
reduced noise, better energy efficiency, and 
improved cooler and heater performance.

The heater and cooler units are combined in a 
single unit and a mode film damper is installed to 
reduce ventilation resistance, increase fan power, 
and lessen the noise.

A flow rate control valve is incorporated, which 
prevents blown air reheating when A/C is set to 
maximum and which reduces temperature fluctu-
ation from changes in engine speed. 

A maximum A/C damper is used to produce a 
greater volume of air when the cooling is set to 
maximum A/C.

The heater unit and blower assembly are com-
bined in a single unit for ease of assembly.

AC206366AB

OUTSIDE/INSIDE AIR 
SELECTION DAMPER

MAX A/C DAMPER

AIR MIXING DAMPER

MODE FILM DAMPER

HEATER CORE

EVAPORATOR

HEATER UNIT

FLOW RATE CONTROL VALVE

HEATER AND AIR CONDITIONING SYSTEM

HEATER, AIR CONDITIONING AND VENTILATION

55-6

OPERATION

.

DURING COOLING
Air is blown by the blower unit (blower motor) to the 
evaporator where it is cooled. It passes the heater 
core or the open part of the air mix damper and is 
blown by the mode film damper to each outlet.

.

DURING HEATING
Air is blown by the blower unit (blower motor) to the 
heater core where it is warmed. Next, it is dehumidi-
fied by the evaporator. The dehumidified air is 
warmed by the heater core, and then it is blown by 
the mode film damper.

FLOW RATE CONTROL VALVE

The flow rate control valve controls the amount of coolant that 
flows to the heater core, simplifying the internal heater unit 
structure, reducing ventilation resistance, and increasing fan 
power. Coolant is stopped from flowing to the heater core when 
the control is set to maximum A/C, which prevents reheating of 
the cooled air.

AC306192AB

BLOWER MOTOR

INSIDE/OUTSIDE 
AIR SELECTION 
DAMPER 

RECIRC

FRESH

EVAPORATOR

FLOW RATE 
CONTROL VALVE

HEATER CORE

MODE FILM DAMPER

SIDE DEFROSTER

FRONT DEFROSTER

SIDE 
DEFROSTER

SIDE OUTLET

SIDE 
OUTLET

CENTER OUTLET

HEATER OUTLET
TO DRIVER SIDE

HEATER OUTLET
TO PASSENGER SIDE

HEATER OUTLET
TO COMPARTMENT

AIR MIX 
DAMPER

MAX A/C 
DAMPER

AC207200AB

FROM ENGINE

TO ENGINE

FLOW RATE 
CONTROL VALVE

CONTROLLER

BYPASS ROUTE

HEATER AND AIR CONDITIONING SYSTEM

HEATER, AIR CONDITIONING AND VENTILATION

55-7

MODE FILM DAMPER

A mode film damper is used as a air outlet changeover damper 
to reduce ventilation resistance, increase fan power, and 
reduce noise.

.

OPERATION

Turn  the air outlet changeover damper motor (mode 
film damper) to  change the air outlet and blow.

AC302893

BLOW FROM
HEATER CORE

AC

TO EACH AIR OUTLET

AC306193

<FOOT>

<FOOT/DEF>

<FACE/FOOT>

<FACE>

<DEF>

TO FACE

TO FACE

TO FOOT

TO FOOT

TO DEF

TO DEF

AB

AIR OUTLET CHANGEOVER DAMPER
(MODE FILM DAMPER)

AIR OUTLET CHANGEOVER DAMPER
(MODE FILM DAMPER)

AIR OUTLET CHANGEOVER DAMPER
(MODE FILM DAMPER)

AIR OUTLET CHANGEOVER DAMPER
(MODE FILM DAMPER)

AIR OUTLET CHANGEOVER 
DAMPER (MODE FILM DAMPER)

TO FOOT

HEATER CONTROL

HEATER, AIR CONDITIONING AND VENTILATION

55-8

HEATER CONTROL

M2551000900045

HEATER CONTROLLER (A/C-ECU)

.

AC306214

AC306220

AC306222

AC306221

AC306419

AIR CONDITIONING 
SWITCH

AIR SELECTION SWITCH

AIR SELECTION SWITCH

REAR WINDOW 
DEFOGGER SWITCH

REAR WINDOW 
DEFOGGER SWITCH

MAX A/C POSITION

 

MAX A/C POSITION

 

<MANUAL AIR CONDITIONING 
(LOW GRADE TYPE)>

<MANUAL AIR CONDITIONING 
(MIDDLE GRADE TYPE)>

<AUTOMATIC AIR CONDITIONING>

<VEHICLES FOR USA>

<VEHICLES FOR CANADA>

TEMPERATURE 
CONTROL DIAL

BLOWER SPEED 
SELECTION DIAL, 
AIR CONDITIONING 
SWITCH

AIR SELECTION SWITCH

REAR WINDOW 
DEFOGGER SWITCH

AB

MODE 
SELECTION DIAL

MODE 
SELECTION DIAL

MODE 
SELECTION DIAL

TEMPERATURE 
CONTROL DIAL

BLOWER SPEED 
SELECTION DIAL, 
AIR CONDITIONING 
SWITCH

BLOWER SPEED 
SELECTION DIAL

TEMPERATURE 
CONTROL DIAL

AIR SELECTION SWITCH

MODE 
SELECTION DIAL

TEMPERATURE 
CONTROL DIAL

BLOWER SPEED 
SELECTION DIAL, 
AIR CONDITIONING 
SWITCH

REAR WINDOW 
DEFOGGER SWITCH

 

 

 

 

 

 

 

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