Isuzu 1999 RODEO Workshop Manual page 66

1A–38 HEATING, VENTILATION AND AIR CONDITIONING (HVAC)
Condition
Suction (Low Gauge) Pressure
Abnormally Low.
Frost on the expansion valve inlet
line
Suction (Low Gauge) Pressure
Abnormally Low
Receiver/drier inlet and
refrigerant line temperature.
distinct difference in temperature
develops.)
Suction (Low Gauge) Pressure
Abnormally Low.
Expansion valve outlet refrigerant
line. (Not cold and low pressure
gauge indicates vacuum.)
Suction (Low Gauge) Pressure
Abnormally Low.
When the refrigerant line is clogged
or blocked, the low pressure gauge
reading will decrease, or a vacuum
reading may be shown.
Suction (Low Gauge) Pressure
Abnormally Low.
Evaporator core is frozen.
Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
High.
Insufficient cooling.
Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
High.
Suction (Low) pressure hose (Not
cold).
Suction (Low Gauge) and Discharge
(High Gauge) Pressure Abnormally
Low.
Insufficient cooling
A/C — Air Conditioning
Possible cause
Expansion valve clogged.
Receiver/Drier clogged.
outlet
(A
Expansion valve temperature sensor
is defective.
Clogged or blocked refrigerant line.
Thermo switch defective.
Excessive refrigerant in system.
Condenser clogged or dirty.
Air in system.
Insufficient refrigerant in system.
Correction
Replace the expansion valve.
Replace the receiver/drier.
Replace the expansion valve.
Replace refrigerant line.
Replace thermo switch.
Discharge and recover
refrigerant, the Recharge to the
specified amount.
Clean the condenser fin.
Evacuate and charge refrigerant.
Check for leaks. Discharge and
recover refrigerant. Recharge to
specified amount.
the