Mitsubishi 380. Manual - part 213

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONING AND VENTILATION

55-148

POWER RELAY CHECK

M1552008800321

BLOWER RELAY CONTINUITY CHECK

Hissing or swishing 
noise

Low refrigerant quantity

Refrigerant level

Check system for leaks 
and charge to 
specification

Rattling (Internal 
compressor)

Lack of lubricating oil. In a 
system with a gas leak 
the oil has escaped with 
the refrigerant

Rattling noise from 
internal compressor

Repalce the compressor 
and also fix the system 
leak to prevent 
reoccurrance

Wooing (Resonant 
noise)

Drive accessory (P/S 
pump, Alternator,etc) 
resonating at specific 
engine speed

The drive accessories for 
vibration

Stop vibrations of the 
assembly or modify 
transmission route to the 
vehicle body

Cooing (Discharge 
pulsation noise)

Pressure fluctuation of 
refrigerant discharged 
from compressor, which 
vibrates the high pressure 
piping

Remove the piping 
mounting clamps and 
re-check. Hold the 
condenser without 
mountings by hand and 
re-check

Put rubber bush between 
pipe clamps and the 
vehicle body. decrease 
refrigerant to minimum 
specified level.

NOISE DESCRIPTION

POSSIBLE CAUSE

CHECK

REPAIR

BATTERY 
VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

4 

− 5

Open circuit

• Connect 

terminal 1 to the 
positive battery 
terminal

• Connect 

terminal 3 to the 
negative battery 
terminal

4 

− 5

Less than 2 ohms

25DB057A

4
5

1 2 3

5

1

4

3

BLOWER RELAY

ON-VEHICLE SERVICE

HEATER, AIR CONDITIONING AND VENTILATION

55-149

A/C COMPRESSOR CLUTCH RELAY CONTINUITY 
CHECK

IDLE-UP OPERATION CHECK

M1552001600401

Before inspection and adjustment, set vehicle in the following 

condition:

• Engine coolant temperature: 80 − 90 °C (176.0 − 194.0 °F)

• Lights, electric cooling fan and accessories: OFF

• Transmission: Neutral ("N" or "P" position)

• Steering wheel: Straightforward

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

Standard value: 680 

± 50 r/min

2. Turn on the air conditioning switch and the blower speed 

selection dial. Engine idling speed should be within the 
standard value:

Standard value: 680 

± 50 r/min

NOTE: The Electronic control unit determines whether the 
A/C load is low or high according to the output signal from 
the A/C-ECU.

NOTE: It is not necessary to make an adjustment, because 
the idling speed is automatically controlled by the ENGINE 
ECU.

BATTERY 
VOLTAGE

TESTER 
CONNECTION

SPECIFIED 
CONDITION

Not applied

1 

− 4

Open circuit

• Connect 

terminal 2 to the 
positive battery 
terminal

• Connect 

terminal 3 to the 
negative battery 
terminal

1 

− 4

Less than 2 ohms

AC306655

2

1

3 4

1

2

4

3

AB

A/C COMPRESSOR CLUTCH RELAY

FRONT OF 
VEHICLE

JUNCTION BLOCK 

TRIANGLE MARK

HEATER CONTROL ASSEMBLY AND A/C SWITCH

HEATER, AIR CONDITIONING AND VENTILATION

55-150

HEATER CONTROL ASSEMBLY AND A/C SWITCH

REMOVAL AND INSTALLATION

M1552002400369

25DB137A

1

2

REMOVAL STEPS

1.

CENTER PANEL ASSEMBLY 
(REFER TO GROUP 52A, 
INSTRUMENT PANEL 

P.52A-4

)

2.

HEATER CONTROL (A/C-ECU)

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND EVAPORATOR UNIT

HEATER, AIR CONDITIONING AND VENTILATION

55-151

HEATER UNIT, HEATER CORE, BLOWER ASSEMBLY AND 

EVAPORATOR UNIT

REMOVAL AND INSTALLATION

M1552021400012

WARNING

•

Before removing the front seat assembly, refer to GROUP 52B, Service Precautions 

P.52B-16

 and Air Bag Module and Clock Spring 

P.52B-237

.

Pre-removal and Post-installation Operation
• Refrigerant draining and Refilling (Refer to Charging and 

Discharging 

P.55-142

).

• Engine coolant Draining and Refilling (Refer to GROUP 

00, Engine coolant 

P.00-47

).

• Instrument Panel Removal and Installation (Refer to 

GROUP 52A, Instrument Panel 

P.52A-4

).

• Steering Column Shaft Assembly Removal and Installa-

tion (Refer to GROUP 37A, Steering Shaft

P.37-25

).

• Floor Console Removal and Installation (Refer to GROUP 

52A, Floor Console 

P.52A-10

).

• Front Seat Assembly Removal and Installation (Refer to 

GROUP 52A, Front Seat 

P.52A-21

).

²

Strut Tower Bar (Refer to GROUP 42, Removal And 
Installation

P.42-12

.)

25DB058A

1

2

3

4

N

5

6

7

2, 3

A/C compressor oil:

  ND Oil 8

-Pipe coupling

4

4.9 ± 0.9 N·m

43 ± 8 in-lb

22 ± 4 N·m

16 ± 3 ft-lb

22 ± 4 N·m

16 ± 3 ft-lb

12 ± 2 N·m

102 ± 22 in-lb

12 ± 2 N·m

102 ± 22 in-lb

REMOVAL STEPS

•

BATTERY

•

AIR CLEANER BODY (REFER TO 
GROUP 15, AIR CLEANER 

P.15-4

.)

1.

HEATER HOSE CONNECTION

<<A>>

2.

SUCTION PIPE CONNECTION

<<A>>

3.

LIQUID PIPE CONNECTION

4.

O-RING

•

REAR HEATER DUCT A AND B 
(REFER TO 

P.55-175

.)

5.

JUNCTION BLOCK

REMOVAL STEPS (Continued)