Suzuki GRAND VITARA Owner's Manual page 1131

High pressure gauge
Condition
Pressure is higher than
acceptable range
("A" area)
Pressure is lower than
acceptable range
("B" area)
Low pressure gauge
Condition
Pressure is higher than
acceptable range
("C" area)
Pressure is lower than
acceptable range
("D" area)
Possible Cause
Refrigerant overcharged
Expansion valve frozen or clogged
Clogged refrigerant passage of high side
Radiator cooling fan malfunction (Insufficient
cooling of condenser)
Dirty or bent condenser fins (Insufficient
cooling of condenser)
Compressor malfunction (Insufficient oil etc.) Check compressor.
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)
Air Conditioning System:
Correction
Recharge.
Check expansion valve.
Clean or replace.
Check radiator cooling fan.
Clean or repair.
Check engine cooling system referring to
"Engine Cooling Symptom Diagnosis: in
Section 1F".
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.
7B-22