Performance Diagnosis Table - Suzuki GRAND VITARA XL-7 Owner's Manual

1B-12 AIR CONDITIONING (OPTIONAL)

Performance diagnosis table

HIGH PRESSURE GAUGE
Condition
Pressure high
("A" area of high side
graph)
Pressure low
("B" area of high side
graph)
LOW PRESSURE GAUGE
Condition
Pressure high
("C" area of low side
graph)
Pressure low
("D" area of low side
graph)
THERMOMETER AT CENTER DUCT
Condition
Outlet air temperature at
center duct is high
(Crossing point is in area
"E")
Outlet air temperature at
center duct is low
(Crossing point is in area
"F")
NOTE:
If ambient temperature is within 30 - 35 °C (85 - 95 °F), it is possible to do using "DETAIL DIAGNOSIS
TABLE" in this section for detail diagnosis.
Possible Cause
Refrigerant overcharged
Expansion valve frozen or clogged
Clogged refrigerant passage of high side
Condenser cooling fan malfunction (Insufficient cooling
of condenser)
Dirty or bent condenser fins (Insufficient cooling of con-
denser)
Compressor malfunction (Insufficient oil etc.)
Engine overheat
Insufficient refrigerant (Insufficient charge or leakage)
Expansion valve malfunction (valve opens too wide)
Compressor malfunction (Insufficient compression)
Possible Cause
Expansion valve malfunction (valve opens too wide)
Compressor malfunction (Insufficient compression)
Insufficient refrigerant (Insufficient charge or leakage)
Expansion valve malfunction (valve opens too narrow)
Clogged refrigerant passage (crashed pipe)
Possible Cause
Insufficient or excessive charge of refrigerant
Dirty or bent A/C evaporator fins
Air leakage from cooling (heater) unit or air duct
Malfunctioning, switch over function of damper in cool-
ing (heater) unit
Compressor malfunction
Insufficient air volume from center duct (Heater blower
malfunction)
Compressor malfunction
Correction
Recharge.
Check expansion valve.
Clean or replace.
Check condenser cooling fan.
Clean or repair.
Check compressor.
Check engine cooling system.
Check for leakage, repair if necessary
and recharge.
Check expansion valve.
Check compressor.
Correction
Check expansion valve.
Check compressor.
Check for leakage, repair if necessary
and recharge.
Check expansion valve.
Repair or replace.
Correction
Check refrigerant pressure.
Clean or repair.
Repair or replace.
Repair or replace.
Check compressor.
Check blower motor and fan.
Check compressor.