Isuzu N-Series. Manual - part 47

SERVICE INFORMATION 00-19

Magnetic Clutch Troubleshooting

The air conditioning is made up of the evaporator, con-
denser, electronic thermostat, A/C switch, fan switch
and relays.
The air conditioning starts its operation when both the A/
C switch and the fan switch are turned on and the mag-
netic clutch gets engaged through the A/C thermo relay

while the engine is running. And it stops when either A/
C switch or fan switch is turned off.
In addition to these switches, the air conditioning is also
stopped by turning off the magnetic clutch temporarily
under the predetermined condition when the abnormal
refrigerant pressure is sensed by pressure switch, or
when the air temperature is sensed by electronic ther-
mostat that prevents the evaporator core from freezing.

For 12 Volt (LHD Model Except 4JH1)

B-39

B-39

B-39

B-17

B-17

B-15

B-15

X-10

X-10

X-10

X-10

J-6

J-6

H-5

B-42

B-15

B-1

B-7

1

5

2

4

2

4

3

1

2

3

3

1

2

2

1

3L

0.5BR

0.5BR

1.25LG/B

0.5LG

1.25L

0.85G/W

0.85G/W

0.85G/O

0.85G/O

0.5G/Y

0.5G/Y

B-42

1

0.5P/G

2L

2B

3B

3B

5B

RELAY;
HEATER & A/C

FL-25 30A

F-1   10A

BLOWER
MOTOR

PRESSURE
SWITCH

4

1

3

2

OFF

FAN SWITCH

ELECTRONIC

THERMOSTAT

A/C SWITCH

MAGNETIC CLUTCH

(COMPRESSOR)

RELAY;
A/C THERMO

HEADLIGHT BRACKET (LH)

FRAME-LH (FRONT)

AIR CON

HEATER

E-5

1

0.85G/O

2

4JB1 / 4HG1 ENGINE ONLY 

DIODE

H-14

6

N1A0203E

00-20 SERVICE INFORMATION

For 12 Volt (LHD Model 4JH1/Taiwan)

B-39

B-39

B-39

B-17

B-17

B-15

B-15

X-10

X-10

X-10

X-10

J-6

J-6

H-14

E-5

H-5

B-42

B-15

B-7

1

5

2

4

2

2

1

1

2

3

3

1

2

2

1

1

1

1

2

3L

0.85BR

0.85BR

1.25LG/B

0.5LG

1.25L

0.85G/W

0.85G/W

0.85G/O

0.85G/Y

2B

0.5G/Y

0.5G/Y

0.5P/G

2L

2B

5B

3B

F-25   30A

F-1   10A

DIODE

PRESSURE
SWITCH

4

1

3

2

OFF

FAN SWITCH

ELECTRONIC THERMOSTAT

A/C SWITCH

MAGNETIC

CLUTCH

(COMPRESSOR)

RELAY;
A/C THERMO

HEADLIGHT BRACKET (LH)

AIR CON

HEATER

0.85G/Y

B-42

X-24

X-24

1

2

RELAY;

A/C COMPRESSOR

RELAY;
HEATER & A/C

BLOWER
MOTOR

TAIWAN

N1A0218E

SERVICE INFORMATION 00-21

For 12 Volt (RHD Model)

B-39

B-39

B-39

B-18

B-18

B-15

B-15

X-10

X-10

X-10

X-10

H-5

B-42

B-15

B-1

B-7

1

5

2

4

2

4

3

1

2

3

3

1

2

2

3L

0.85BR

0.85BR

1.25LG/B

0.5LG

1.25L

0.85G/W

0.85G/W

0.5G/Y

0.5G/Y

B-42

1

2B

2B

0.5P/G

2L

3B

3B

5B

FL-25 30A

F-1   10A

DIODE

PRESSURE
SWITCH

4

1

3

2

FAN SWITCH

ELECTRONIC THERMOSTAT

A/C SWITCH

RELAY;
A/C THERMO

HEADLIGHT BRACKET (LH)

FRAME-LH (FRONT)

AIR CON

HEATER

2

X-24

1

X-24

1

J-6

2

J-6

H-14

E-5

7

1

MAGNETIC

CLUTCH

(COMPRESSOR)

0.85G/Y(4JH1)

0.85G/O

RELAY;
HEATER & A/C

BLOWER
MOTOR

RELAY;
A/C
COMPRESSOR

0.5G/O(4JG2)

0.85G/O(4JB1)

H-14

1

0.85G/Y

4JH1

N1A0219E

00-22 SERVICE INFORMATION

For 24 Volt (LHD Model)

J-6

J-6

B-42

B-7

B-1

B-39

B-39

B-39

B-15

B-15

B-15

X-10

X-10

X-10

X-10

H-5

B-17

B-17

OFF

H-14

E-5

1

2

3

3

4

1

2

5

4

2

3

1

2

2

2

6

1

0.85BR

0.85BR

2B

B-42

1

0.5G/Y

0.5G/Y

0.5LG

0.5LG

0.5P/G

0.85G/W

0.85G/W

0.85BR

3B

5B

F-1   15A

RELAY; 
A/C THERMO 

MAGNETIC 
CLUTCH

ELECTRONIC
THERMOSTAT

4

3

2

1

FAN SW

A/C SW

FRAME-LH (FRONT)

HEADLIGHT BRACKET (LH)

PRESSURE
SWITCH

0.5LG/B

AIR CON, HEATER

DIODE

0.85B

1

RELAY;
HEATER & A/C

BLOWER
MOTOR

0.85G/O

0.85G/O

0.85G/O

N1A0205E