Isuzu N-Series. Manual - part 49

SERVICE INFORMATION 00-27

N1A0127E

00-28 SERVICE INFORMATION

Compressor Troubleshooting

ITEM

TROUBLE

POSSIBLE CAUSE

CORRECTION

1

Noise from compressor

1. Defective Piston
2. Defective bearing
3. Defective shaft

Replace cylinder and shaft assembly
Replace cylinder and shaft assembly
Replace cylinder and shaft assembly

2

Noise from magnetic 
clutch face

1. Defective bearing
2. Defective clutch
3. Clearance between drive plate 

and pulley is not standard

Replace magnetic clutch
Replace magnetic clutch
Adjust the clearance or replace mag-
netic clutch

3

Insufficient cooling

1. Defective gasket
2. Defective reed valve
3. Defective suction valve

Replace gasket
Replace valve plate
Replace suction valve

4

Not rotating

1. Defective piston
2. Defective shaft
3. Rotating parts seized due to in-

sufficient oil

Replace cylinder and shaft assembly
Replace cylinder and shaft assembly
Replace compressor

5

Oil and/or gas leakage

1. Defective seal
2. Defective O-ring

Replace shaft seal
Replace

SERVICE INFORMATION 00-29

Individual Inspection

Blower Motor

1. Disconnect the blower motor connector from the

blower motor.

2. Connect the battery positive terminal to the No. 1

(No. 2; RHD) terminal of the blower motor and neg-
ative to the No. 2 (No. 1, RHD).

3. Be sure to check to see if the blower motor oper-

ates correctly.

Resistor

1. Disconnect resistor connector.
2. Check for continuity and resistance between the

terminals of the resistor.

Except Taiwan

For Taiwan

Fan Switch

Check for continuity between fan switch and A/C switch
side connector terminals.

Legend

1. SW position
2. Terminal No.
3. Resistance value

N1A0005E

1

4

3

2

1

2

3

4

1

9.3

24V

4.0

1.2

1

4

2

3

2

2

4

3

3

1

1

N1A0132E

N1A0006E

N1A0007E

00-30 SERVICE INFORMATION

Heater & A/C and A/C Thermo Relay

Check for continuity between relay side connector termi-
nal.
3 — 5 --- Continuity
1 — 5 --- No Continuity
When battery voltage is applied between 2 — 4
3 — 5 --- No Continuity
1 — 5 --- Continuity

A/C Switch

Check for continuity between A/C switch side connector
terminals.

Magnetic Clutch

1. Disconnect the magnetic clutch harness connec-

tors.

2. Apply battery voltage to the clutch side connector

terminal, check to see if the magnetic clutch is at-
tracted to the pulley. 

Pressure Switch

Disconnect the connector and check for continuity be-
tween pressure switch side connector terminal.

For GCC

N1A0008E

N1A0009E

Terminal No.

Control

Continuity

1 — 2

Magnetic CIutch

Continuity

N1A0010E

2

1

N1A0011E