Isuzu 1999 RODEO Workshop Manual page 65

Legend
(1) Low Side
(2) High Side
Condition
Discharge (High Gauge) Pressure
Abnormally High Abnormally High
Discharge (High Gauge) Pressure
Abnormally High.
Insufficient cooling.
Discharge (High Gauge) Pressure
Abnormally High.
High pressure gauge drop. (After
stopping A/C, the pressure drops
approx. 196 kPa (28 psi) quickly)
Discharge (High Gauge) Pressure
Abnormally Low.
Insufficient cooling
Discharge (High Gauge) Pressure
Abnormally Low.
Low pressure gauge
vacuum.
Discharge (High Gauge) Pressure
Abnormally Low.
Frost or dew on refrigerant line
before and after the receiver/drier or
expansion valve, and low pressure
gauge indicates vacuum.
Discharge (High Gauge) Pressure
Abnormally Low.
High and low pressure gauge
balanced quickly. (After turned off
A/C)
Suction (Low Gauge) Pressure
Abnormally High.
Low pressure gauge (Low pressure
gauge is lowered after condenser is
cooled by water.)
Suction (Low Gauge) Pressure
Abnormally High.
Low pressure hose temperature.
(Low pressure hose temperature
around the compressor refrigerant
around the com ressor refrigerant
line connector is lower than around
evaporator.)
Suction (Low Gauge) Pressure
Abnormally High.
High and low pressure gauge
balanced quickly. (After turned off
A/C)
Suction (Low Gauge) Pressure
Abnormally Low.
Insufficient cooling.
HEATING, VENTILATION AND AIR CONDITIONING (HVAC) 1A–37
Possible cause
Condenser clogged or dirty.
Cooling fan
properly.
Excessive refrigerant in system.
Air in system.
Insufficient refrigerant in system.
Clogged or defective expansion
valve.
indicates
Restriction caused by debris or
moisture in the receiver/drier.
Compressor seal defective
Poor compression due to a defective
compressor gasket.
Excessive refrigerant in system.
Unsatisfactory valve operation due
to defective temperature sensor of
expansion valve.
Expansion valve opens too long.
Compressor gasket is defective.
Insufficient refrigerant in system.
Clean the condenser fins
does not operate Check the cooling fan operation.
Discharge and recover refrigerant.
Recharge to specified amount.
Evacuate and charge refrigerant
system.
Check for leaks. Discharge and
recover the refrigerant. Recharge to
the specified amount.
Replace the expansion valve.
Check system for restriction and
replace the receiver/drier.
Repair or replace the compressor.
Repair or replace the compressor.
Discharge and recover refrigerant
Recharge to specified amount.
Replace the expansion valve.
Replace the expansion valve.
Repair or replace the compressor.
Check for leaks. Discharge and
recover the refrigerant. Recharge to
specified amount.
Correction