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
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