Diagnosis; General - Suzuki sq-416-420-625 Service Manual

1B-6 AIR CONDITIONING (OPTIONAL)

GENERAL

Condition
Cool air won't come out
(A /C system won't
operative)
Cool air won't come out
(A /C compressor won't
operative)
Cool air won't come out
(A /C condenser cooling
fan motor won't
operative)
Cool air won't come out
(Blower motor won't
operative)
Cool air won't come out
or insufficient cooling
(A /C system normal
operative)

DIAGNOSIS

Possible Cause
D No refrigerant
D Fuse blown
D A/C switch faulty
D Blower motor switch faulty
D A/C thermistor faulty
D Dual pressure switch faulty
D Wiring or grounding faulty
D A/C ON permission signal in ECM
faulty
D A/C controller and its circuit faulty
D Magnet clutch faulty
D Compressor relay faulty
D Compressor thermal switch faulty
(if equipped)
D Drive belt loose or broken
D Compressor faulty
D A/C ON permission signal in ECM
faulty
D A/C controller faulty
D Condenser cooling fan relay faulty
D Wiring or grounding faulty
D "A/C condenser cooling fan relay"
signal in ECM faulty
D Condenser cooling fan motor faulty
D Fuse blown
D Blower motor relay faulty
D Blower motor resistor faulty
D Blower motor switch faulty
D Wiring or grounding faulty
D Blower motor faulty
D Insufficient or excessive charge of
refrigerant
D Refrigerant leak in system
D Condenser clogged
D A/C evaporator clogged or frosted
D A/C thermistor faulty
D A/C controller faulty
D Expansion valve faulty
D Drive belt slipping
D Magnetic clutch faulty
Correction
Recover, evacuation and charging.
Check "IG METER" fuse, "REAR DEFG"
fuse, and "A/C FUSE" and check for
short circuit to ground.
Check A/C switch.
Check blower motor switch.
Check A/C evaporator thermistor.
Check dual pressure switch.
Repair as necessary.
Check ON permission signal.
Check A/C controller and its circuit.
Check magnet clutch.
Check compressor thermal switch.
Check compressor relay.
Adjust or replace drive belt.
Check compressor.
Check ON permission signal.
Check A/C controller.
Check condenser cooling fan relay.
Repair as necessary.
Check A/C condenser cooling fan relay
signal.
Check condenser cooling fan motor.
Check "HEATER FUSE", "REAR DEFG"
fuse and check for short circuit to
ground.
Check blower motor relay.
Check blower motor resistor.
Check blower motor switch.
Repair as necessary.
Check blower motor.
Check charge of refrigerant.
Check system for leaks.
Check condenser.
Check A/C evaporator.
Check A/C thermistor.
Check A/C controller.
Check expansion valve.
Check or replace drive belt.
Check magnetic clutch.