Isuzu KB P190. Manual — part 30
1-86 HEATER AND AIR CONDITIONING
BLOWER MOTOR DOES NOT RUN
Replace
YES
• Is No.SBF-6 (30A) (except C24SE) or No.SBF-8
(30A) (C24SE) slow blow fuse OK?
• Is heater & A/C relay (X-11) OK?
YES
• Is resistor OK?
YES
• Is fan control knob (Fan switch) OK?
YES
YES
• Check to see if battery voltage is present at
chassis side connector terminal No.C105-1 is there a
battery voltage?
• Turn the ignition switch "ON" (Engine is running)
• Fan control knob (Fan switch) "ON"
• Is blower motor OK?
YES
Open circuit either between chassis side connector
terminal No.C105-2 and No.C104-3 or No.B13-1 and
body ground No.C-109.
NO
Replace
NO
Replace
NO
NO
Replace control lever
assembly
Replace
NO
NO
Open circuit between
No.SBF-6 (30A) (except
C24SE) or No.SBF-8 (30A)
(C24SE) slow blow fuse and
No.C105-1.
HEATER AND AIR CONDITIONING 1-87
BLOWER MOTOR DOES NOT RUN IN CERTAIN POSITION
A
1: (Low)
Blower motor does not
B
2: (Medium Low) Position
run at
C
3: (Medium Hi)
D
4: (High)
* Checking is performed only when in the malfunction
mode.
• Is resistor OK?
YES
• Is fan control knob (Fan switch) OK?
YES
Condition:
• Open circuit between chassis side connector
terminal No. C104-2 and No. B13-3
B
Condition :
• Open circuit between chassis side connector
terminal No. C104-4 and No. B13-6
C
Condition:
• Open circuit between chassis side connector
terminal No. C104-1 and No. B13-5
D
Condition:
• Open circuit between chassis side connector
terminal No. C105-2 and No. B13-4
Replace
NO
NO
Replace control lever
assembly
A
1-88 HEATER AND AIR CONDITIONING
BLOWER MOTOR DOES NOT STOP AT “OFF” POSITION
• Is fan control knob (Fan switch) OK?
YES
Check the circuit between chassis side connector terminals
for short to GND
• No. C105-2 and No. C104-3
(or)
• No . C105-2 and No. B13-4
(or)
• No . C104-1 and No. B13-5
(or)
• No . C104-4 and No. B13-6
(or)
• No . C104-2 and No. B13-3
NO
Replace control lever assembly
HEATER AND AIR CONDITIONING 1-89
AIR CONDITIONING CYCLE TROUBLESHOOTING
TROUBLE POSSIBLE
CAUSE
CORRECTION
1. Magnetic clutch does not run
•
Refer to “MAGNETIC CLUTCH”
troubleshooting in this section
2. Compressor is not rotating properly
•
Drive belt loosened or broken
•
Adjust the drive belt to the specified
tension or replace the drive belt
•
Magnetic clutch face is not clean and
slips
•
Clean the magnetic clutch face or replace
•
Incorrect clearance between magnetic
drive plate and pulley
•
Adjust the clearance (Refer to
“COMPRESSOR OVERHAUL”)
•
Compressor oil leaks from shaft seal or
shell
•
Replace the compressor
•
Compressor seized
•
Replace the compressor
3. Insufficient or excessive charge of
refrigerant
•
Discharge and recover refrigerant.
Recharge to specified amount.
4. Leaks in the refrigerant system
•
Check refrigerant system for leaks and
repair as necessary
Discharge and recover refrigerant.
Recharge to specified amount.
5. Condenser clogged or insufficient radiation
•
Clean the condenser or replace as
necessary
•
Check radiator or condenser fan function
6. Temperature control link unit of the heater
unit defective
•
Repair the link unit
7. Unsteady operation due to foreign
substance in expansion valve
•
Replace the expansion valve
No cooling or
insufficient
cooling
8. Poor operation of electronic thermostat
•
Check electronic thermostat and replace
as necessary
1. Evaporator clogged or frosted
•
Check evaporator core and replace or
clean the core
2. Air leaking from cooling unit or air duct
•
Check evaporator and duct connection,
then repair as necessary
Insufficient
velocity
of cooling air
3. Blower motor does not rotate properly
•
Refer to “FAN CONTROL KNOB (FAN
SWITCH)” troubleshooting in this section
* For the execution of the charging and discharging operation in the table above, refer to the “RECOVERY,
RECYCLING, EVACUATING AND CHARGING” in this section.
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