Mitsubishi Grandis. Manual - part 332

REAR A/C SWITCH

HEATER, AIR CONDITIONER AND VENTILATION

55-213

REAR A/C SWITCH

REMOVAL AND INSTALLATION

M1554017200022

INSPECTION

M1552014301414

REAR HEATER CONTROLLER 
CONTINUITY CHECK

AC303126

2

1

1

2

AB

<Vehicles with sunroof>

<Vehicles without sunroof>

Removal steps

1.

Rear heater controller (Refer to 
GROUP 52A, Headlining 

P.52A-17

.)

•

Headlining (Refer to GROUP 52A, 
Headlining 

P.52A-17

.)

2.

Rear heater controller bracket

AC303225

1 2 3 4 5 6 7 8 9 10

11 12 13 14 15 16 17 18 19 20

REAR HEATER UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-214

REAR AIR VOLUME ADJUSTING SWITCH

REAR TEMPERATURE CONTROL KNOB 
<VEHICLES WITH DUAL AUTOMATIC 
A/C>

Check that the resistance value between connector 
terminals 14 and 15 changes gradually within the 
standard value when moving the knob.

Standard value: Approximately 3k

Ω or less

REAR HEATER UNIT

REMOVAL AND INSTALLATION

M1554015300023

Switch status

Checking 
terminal

Normal 
conditions

OFF

4 

−  9

2 

Ω or less

AUTO 
<vehicles with 
dual automatic 
A/C>

5 

−  9

2 

Ω or less

1

6 

−  9

2 

Ω or less

2

7 

−  9

2 

Ω or less

3

8 

−  9

2 

Ω or less

Pre-removal and Post-installation Operation
• Engine coolant Draining and Refilling (Refer to GROUP 

14, On vehicles service 

P.14-16

.)

• Refrigerant draining and Refilling (Refer to Charging 

P.55-191

 and Discharging 

P.55-190

.)

• Third seat assembly removal and installation (Refer to 

GROUP 52A, Third Seat Assembly 

P.52A-33

.)

• Quarter trim lower and quarter trim upper removal and 

installation (Refer to GROUP 52A, Interior Trim 

P.52A-10

.)

AC303098

2

3

6

5

1

AB

4

4

N

13.7 ± 1.0 N·m

32 ± 2 N·m

3

A/C compressor oil:
  SUN PAG 56

-Pipe coupling

REAR HEATER UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-215

REMOVAL SERVICE POINTS
<<A>> REAR A/C PIPE REMOVAL

CAUTION

Use the plug which is not breathable because 
A/C compressor oil or receiver have high 
hygroscopicity.
Plug the pipe nipple to prevent the entry of dust and 
dirt.

DISASSEMBLY AND REASSEMBLY 
<VEHICLES WITH REAR HEATER, REAR 
COOLER OR DUAL AUTOMATIC A/C>

M1554017600019

Removal steps

1.

Rear pillar duct

2.

Rear floor duct A

<<A>>

3.

Rear A/C pipe connection

4.

O ring

5.

Heater hose connection

6.

Rear heater unit

AC302508

11

2

1

12

13

14

11

10

8

7

9

5

3

4

6

AB

Removal steps

1.

Rear blower motor <Vehicles with 
rear heater, rear cooler or dual 
automatic A/C>

2.

Rear power transistor <Vehicles 
with rear heater, rear cooler or dual 
automatic A/C>

3.

Harness <vehicles with dual 
automatic A/C>

4.

Rear air mix damper control motor 
<Vehicles with dual automatic A/C>

5.

Rear heater pipe bracket <Vehicles 
with rear heater or dual automatic 
A/C>

6.

Rear heater core <Vehicles with 
rear heater or dual automatic A/C>

7.

Rear air mix lever <Vehicles with 
dual automatic A/C>

8.

Rear mode selection damper lever 
A <Vehicles with dual automatic 
A/C>

Removal steps (Continued)

REAR HEATER UNIT

HEATER, AIR CONDITIONER AND VENTILATION

55-216

INSPECTION

M1552014301425

CHECK THE REAR AIR MIX DAMPER 
MOTOR AND POTENTIOMETER 
<VEHICLES WITH DUAL AUTOMATIC 
A/C>

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: 1.20 (MAX COOL) 

− 4.80 

(MAX HOT) k

Ω

9.

Rear mode selection damper lever 
B <Vehicles with dual automatic 
A/C>

10. Rear mode selection damper lever 

C <Vehicles with dual automatic 
A/C>

11. Rear heater case <Vehicles with 

rear heater, rear cooler or dual 
automatic A/C>

12. Evaporator <vehicles with rear 

cooler or dual automatic A/C>

13. Rear mode selection damper 

<Vehicles with dual automatic A/C>

14. Rear mode selection damper 

<Vehicles with dual automatic A/C>

Removal steps (Continued)

AC302969

MAX
COOL

MAX
HOT

1 2 3 4 5

AB

Battery 
connection (+) 
terminal

Battery 
connection (-) 
terminal

Lever 
operation

2

1

Rotate to the 
MAX HOT side.

1

2

Rotate to the 
MAX COOL 
side.