Isuzu 1999 RODEO Workshop Manual page 63

Diagnosis
Air Conditioning Cycle Diagnosis
Condition
No cooling or insufficient cooling.
Insufficient velocity of cooling air.
*For the execution of the charging and discharging
operation in the table above, refer to Recovery,
Recycling, Evacuating and Charging in this section.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–35
Possible cause
Magnetic clutch does not run.
Compressor is not rotating properly.
Drive belt is loosened or broken.
Compressor is not rotating properly.
Magnetic clutch face is not clean and
slips.
Compressor is not rotating properly.
Incorrect clearance
magnetic drive plate and pulley.
Compressor is not rotating properly.
Compressor oil leaks from the shaft
seal or shell.
Compressor is not rotating properly.
Compressor is seized.
Insufficient or excessive charge of
refrigerant.
Leaks in the refrigerant system.
Condenser is clogged or insufficient
radiation.
Temperature control link unit of the
heat unit is defective.
Unsteady operation due to a foreign
substance in the expansion valve.
Poor operation of the electronic
thermostat.
Evaporator clogged or frosted.
Air leaking from the cooling unit or air
duct.
Blower motor does
properly.
Refer to "Magnetic Clutch Diagnosis"
in this section.
Adjust the drive belt to the specified
tension or replace the drive belt.
Clean the magnetic clutch face or
replace.
Adjust the clearance. Refer to
between Compressor in this section.
Replace the compressor
Replace the compressor
Discharge
refrigerant.
specified amount.
Check the refrigerant system for
leaks and repair as necessary.
Discharge
refrigerant.
specified amount.
Clean the condenser or replace as
necessary.
Repair the link unit.
Replace the expansion valve.
Check the electronic thermostat and
replace as necessary.
Check the evaporator core and
replace or clean the core.
Check the evaporator and duct
connection,
necessary.
not rotate Refer to Fan Control Lever (Fan
Switch) Diagnosis in this section.
Correction
and recover the
Recharge to the
and recover the
Recharge to the
then repair as