Isuzu Amigo / Axiom / Trooper / Rodeo / VehiCross. Service manual - part 1078

1A–34 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

Wiring Diagram

D08RY00540

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–35

D08RY00542

1A–36 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)

D08RY00541

HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–37

Diagnosis

Air Conditioning Cycle Diagnosis

Condition

Possible cause

Correction

No cooling or insufficient cooling.

Magnetic clutch does not run.

Refer to “Magnetic Clutch Diagnosis”
in this section.

Compressor is not rotating properly.
Drive belt is loose or broken.

Adjust the drive belt to the specified
tension or replace the drive belt.

Compressor is not rotating properly.
Magnetic clutch face is not clean and
slips.

Clean the magnetic clutch face or
replace.

Compressor is not rotating properly.
Incorrect clearance between
magnetic drive plate and pulley.

Adjust the clearance. Refer to
Compressor in this section.

Compressor is not rotating properly.
Compressor oil leaks from the shaft
seal or shell.

Replace the compressor

Compressor is not rotating properly.
Compressor is seized.

Replace the compressor

Insufficient or excessive charge of
refrigerant.

Discharge and recover the
refrigerant.  Recharge to the
specified amount.

Leaks in the refrigerant system.

Check the refrigerant system for
leaks and repair as necessary.
Discharge and recover the
refrigerant.  Recharge to the
specified amount.

Condenser is clogged or insufficient
radiation.

Clean the condenser or replace as
necessary.

Temperature control link unit of the
heat unit is defective.

Repair the link unit.

Unsteady operation due to a foreign
substance in the expansion valve.

Replace the expansion valve.

Poor operation of the electronic
thermostat.

Check the electronic thermostat and
replace as necessary.

Insufficient velocity of cooling air.

Evaporator clogged or frosted.

Check the evaporator core and
replace or clean the core.

Air leaking from the cooling unit or air
duct.

Check the evaporator and duct
connection, then repair as
necessary.

Blower motor does not rotate
properly.

Refer to Fan Control Lever (Fan
Switch) Diagnosis in this section.

*For the execution of the charging and discharging
operation in the table above, refer to Recovery,
Recycling, Evacuating and Charging in this section.