Mitsubishi Grandis. Manual - part 330

HEATER UNIT AND BLOWER ASSEMBLY

HEATER, AIR CONDITIONER AND VENTILATION

55-205

BLOWER ASSEMBLY DISASSEMBLY 
AND REASSEMBLY

M1554017700016

INSPECTION

M1552014301373

AIR THERMO SENSOR CHECK

Check that the resistance shown in the graph is 
almost satisfied when measuring the resistance 
between the terminals under two or more different 
temperature conditions.
NOTE: The temperature condition in checking 
should be within the range shown.

AC310131AB

3

5

4

9

8

7

6

2

10

1

Removal steps

1.

Front blower motor

2.

Front power transistor

3.

Inside/outside air selection damper 
motor

4.

Inside/outside air selection damper 
lever A

5.

Inside/outside air selection damper 
lever B

6.

Clean air filter

7.

Air intake plate

8.

Inside air damper

9.

Heater blower case upper

10. Heater blower case lower

AC209196

-10

0

10

20

30

40

0

2

4

6

8

AB

RESISTANCE

TEMPERATURE (˚C)

(k

Ω)

MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR, 

HEATER, AIR CONDITIONER AND VENTILATION

55-206

PTC HEATER CHECK <VEHICLE WITH 
REAR HEATER OR DUAL AUTOMATIC 
A/C>

Check that there is continuity between the connector 
terminals 1 and 2 as well as 3 and 4.

MODE SELECTION DAMPER CONTROL MOTOR, AIR 

MIXING DAMPER CONTROL MOTOR, OUTSIDE/INSIDE AIR 

SELECTION DAMPER CONTROL MOTOR, POWER 

TRANSISTOR AND BLOWER MOTOR

REMOVAL AND INSTALLATION

M1554014900022

1 2 3 4

AC303592

AC310137

4

1

2

3

5

AB

MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR, OUTSIDE/INSIDE 

HEATER, AIR CONDITIONER AND VENTILATION

55-207

REMOVAL SERVICE POINT
<<A>> FRONT AIR MIX DAMPER 
CONTROL MOTOR REMOVAL

1. Turn the temperature control dial to the MAX 

COOL position.

2. Turn the air outlet changeover mode to the FACE 

or FACE/FOOT position, and then turn it to the 
FOOT position.

3. Cut the water proof cover away from the groove 

section.

4. Rotate the front air mix damper control motor to 

the direction B by approximately 20

°, and remove 

it while pushing the air mixing control link A.

INSTALLATION SERVICE POINT
>>A<< FRONT AIR MIX DAMPER 
CONTROL MOTOR INSTALLATION

1. Install the front air mix damper control motor to 

the link and rotate it to the direction C by 
approximately 20

°.

2. Temporarily secure the front air mix damper motor 

by the screw.

3. Operate the blower by maximum air volume, 

check the air leak from FACE air outlet. If there is 
the air leak, rotate the air mix damper control 
motor to the direction C to prevent the leak.

Mode selection damper control 
motor removal step

•

Front deck cross member and 
heater unit assembly (Refer to 

P.55-200

. )

1.

Mode selection damper control 
motor
Front air mixing damper control 
motor removal step

•

Cowl side trim (Refer to GROUP 
52A, Interior Trim 

P.52A-10

.)

•

Selector lever, selector lever panel 
and glove box (Refer to GROUP 
52A, Instrument Panel 

P.52A-2

.)

<<A>>

>>A<<

2.

Front air mixing damper control 
motor
Outside/inside air selection 
damper control motor and front 
power transistor removal step

•

Cowl side trim (Refer to GROUP 
52A, Interior Trim 

P.52A-10

.)

•

Selector lever, selector lever panel 
and glove box (Refer to GROUP 
52A, Instrument Panel 

P.52A-2

.)

3.

Front power transistor

4.

Outside/inside air selection damper 
control motor
Front blower motor removal 
step

5.

Front blower motor

AC303011

Water proof cover

AB

Groove section

Corner sensor ECU

AC310135

Air mixing control link A

AB

B

AC310138

Air mixing control link A

C

AB

AC310139

Air mixing control link A

C

AB

B

MODE SELECTION DAMPER CONTROL MOTOR, AIR MIXING DAMPER CONTROL MOTOR, 

HEATER, AIR CONDITIONER AND VENTILATION

55-208

4. Check that there is the pin at the end of hole. If 

there is not, move the front air mix damper control 
motor so that the pin is positioned at the end of 
hole.

5. Retighten the screw.

6. Drill in the section shown.

7. Secure the water proof cover with its replacement 

bracket.

INSPECTION

M1552014301384

CHECK THE AIR OUTLET CHANGEOVER 
DAMPER MOTOR AND POTENTIOMETER

CAUTION

Stop energizing when the lever is set to the 
operation stopping position.

MOTOR CHECK

Potentiometer check
When the resistance value between connector 
terminals 3 and 5 is measured while checking the 
motor, check that the resistance value changes 
gradually within the standard value.

Standard value: 0.80 (FACE) 

− 4.80 (DEF) kΩ

CHECK THE FRONT AIR MIX DAMPER 
MOTOR AND POTENTIOMETER

CAUTION

Stop energizing when the lever is set to the 
operation stopping position.

AC310140 AB

Front air mixing damper motor

Hole

Pin

AC303196AB

Water proof cover

Corner sensor ECU

AC303197

Replacement bracket

Water proof cover

AB

Corner sensor ECU

Battery 
connection 
(+) terminal

Battery 
connection 
(-) terminal

Lever operation

2

1

Rotate to the DEF 
side

1

2

Rotate to the 
FACE side

AC311457

1 2 3 4 5 6 7

AB

DEF position

FACE position

AC311458

MAX
HOT

MAX
COOL

AB