Mitsubishi Galant. Manual — part 725

HEATER CONTROL ASSEMBLY AND A/C SWITCH

TSB Revision

HEATING AND AIR CONDITIONING

55-26

•

Lights, electric cooling fan and accessories: Set to OFF

•

Transmission: Neutral (N or P for vehicles with A/T)

•

Steering wheel: Straightforward

2. Check whether or not the idle speed is the standard value.

<2.4L Engine>: Refer to GROUP 13A, On-vehicle Service

−

Basic Idle Speed Adjustment

P.11A-8

.

<3.0L Engine>: Refer to GROUP 13B, On-vehicle Service

−

Basic Idle Speed Adjustment

P.11A-8

.

Standard value:

••••

<2.4L engine> 750 + 100 r/min

••••

<3.0L engine> 700 + 100 r/min

NOTE: Check 4 minutes after idling begins.

3. When the A/C is running after turning the A/C switch to ON,

and the blower switch to the 3(MH) or 4(HI) position, check
to be sure that the idle speed is at the standard value.

Standard value: 850

±±±±

100 r/min

NOTE: The engine control module <M/T>/the powertrain
control module <A/T> determines whether the A/C load is
low or high according to the output signal from the automatic
compressor controller.

NOTE: It is not necessary to make an adjustment, because
the idling speed is automatically adjusted by the ISC
system. If, however, a deviation from the standard value
occurs for some reason, check the ISC system.

NOTE: Check 4 minutes after idling begins.

HEATER C O N TR O L A SSEM B LY A N D A /C SWITC H

HEATER CONTROL ASSEMBLY AND A/C SWITCH

M1552002400068

REMOVAL AND INSTALLATION

Pre-removal and Post-installation Operation

•

Center Panel Assembly, Front Driver's Side
Under Cover and Front Passenger's Side Under
Cover Removal and Installation (Refer to
GROUP 52A, Instrument Panel

P.52A-4

.)

•

Radio and Tape Player Removal and Installation
(Refer to GROUP 54A, Audio System - Radio
and Tape Player, CD Player and CD Auto
Changer

P.54A-150

.)

•

Floor Console Removal and Installation (Refer to
GROUP 52A, Floor Console

P.52A-11

.)

•

Instrument Panel Center Reinforcement Removal
and Installation (Refer to GROUP 52A,
Instrument Panel

P.52A-4

.)

•

Foot Duct (LH) Removal and Installation (Refer to

P.55-43

.)

HEATER CONTROL ASSEMBLY AND A/C SWITCH

TSB Revision

HEATING AND AIR CONDITIONING

55-27

REMOVAL SERVICE POINTS

<<A>> HEATER CONTROL ASSEMBLY REMOVAL
After disconnecting the heater/cooler unit side connections of
the air mix damper lever cable and air outlet changeover link
cable, remove the heater control assembly.

AC02943

1

2

3

4

5

6

7

8

10

9

AC

REMOVAL STEPS

<<A>>

>>A<<

1.

HEATER CONTROL ASSEMBLY

2.

KNOB ASSEMBLY

3.

BULB HARNESS

4.

DEFROSTER SWITCH

<<B>>

5.

AIR MIX DAMPER LEVER CABLE

<<B>>

6.

AIR OUTLET CHANGEOVER
DAMPER LINK CABLE

7.

HEATER CONTROL PANEL

8.

BLOWER SWITCH ASSEMBLY

9.

BULB

REMOVAL STEPS (Continued)

AC001394AB

HEATER
CONTROL
UNIT

AIR OUTLET
CHANGEOVER
LINK CABLE

AIR MIX
DAMPER
LEVER
CABLE

HEATER CONTROL ASSEMBLY AND A/C SWITCH

TSB Revision

HEATING AND AIR CONDITIONING

55-28

<<B>> AIR MIX DAMPER LEVER CABLE, AIR OUTLET
CHANGEOVER DAMPER LINK CABLE REMOVAL
Insert a flat-tipped screwdriver into the control base clip from
inner side, and then remove the cable by lifting the claw part of
the clip.

INSTALLATION SERVICE POINT

>>A<< HEATER CONTROL ASSEMBLY INSTALLATION
1. Follow the steps below to install the air outlet changeover

damper link cable.

(1) Set the air outlet changeover control knob on the heater

control assembly to the defroster position.

(2) Set the air outlet changeover damper link of the heater/

cooler unit to the defroster position as shown in the
illustration, and then connect the cable to the link pin.

(3) Push the outer cable in the direction so that there is no

looseness, and then secure it with the clip.

2. Follow the steps below to install the air mix damper lever

cable.

(1) Set the temperature control knob on the heater control

assembly to the maximum hot position.

(2) Set the air mix damper lever of the heater/cooler unit to

the maximum hot position as shown in the illustration,
and then connect the cable to the lever pin.

(3) Push the outer cable in the direction so that there is no

looseness, and then secure it with the clip.

3. After installation, ensure that each damper operates

smoothly by operating the heater control assembly knob.

AC001395

FLAT-TIPPED
SCREWDRIVER

CLAW
PART

AB

AC001396

AIR OUTLET
CHANGEOVER
DAMPER LINK

DEFROSTER
POSITION

FACE
POSITION

AB

AC001397

MAXIMUM HOT
POSITION

MAXIMUM COOL
POSITION

AIR MIX
DAMPER
LEVER

AB

HEATER CONTROL ASSEMBLY AND A/C SWITCH

TSB Revision

HEATING AND AIR CONDITIONING

55-29

INSPECTION

M1552002500043

DEFROSTER SWITCH CONTINUITY CHECK

BLOWER SWITCH ASSEMBLY CONTINUITY
CHECK

1. BLOWER SWITCH

2. A/C SWITCH

3. INSIDE/OUTSIDE AIR CHANGEOVER SWITCH

AIR OUTLET
CHANGEOVER
CONTROL KNOB
POSITION

TESTER
CONNECTION

SPECIFIED
CONDITION

DEFROSTER,
DEFROSTER/
FOOT

2-3

Continuity

OTHER POSITION 1-3

Continuity

AC001398

HEATER
CONTROL
ASSEMBLY

AB

SWITCH
POSITION

TESTER
CONNECTION
(CONNECTOR A)

SPECIFIED
CONDITION

0 (OFF)

-

No continuity

1 (LO)

3-5

Continuity

2 (ML)

1-3

Continuity

3 (MH)

3-6

Continuity

4 (HI)

3-4

Continuity

SWITCH
POSITION

TESTER
CONNECTION
(CONNECTOR B)

SPECIFIED
CONDITION

Off

-

No continuity

On

5-6-7

Continuity

SWITCH
POSITION

TESTER
CONNECTION
(CONNECTOR B)

SPECIFIED
CONDITION

Off

1-3

Continuity

On

2-3-4

Continuity

AC001399

CONNECTOR A

CONECTOR B

OFF

ON

OFF

ON

A/C SWITCH

AB