Suzuki Grand Vitara 1998, Service Manual

Page: 77 / 801

YH4
GRAND
VITARA
1B-6 AIR CONDITIONING (OPTIONAL)
DIAGNOSIS
GENERAL
Condition Possible Cause Correction
Cool air won’t come out
(A / C system won’t
operative) No refrigerant
Fuse blown
A / C switch faulty
Blower motor switch faulty
A / C thermistor faulty
Dual pressure switch faulty
Wiring or grounding faulty
A / C ON permission signal in ECM
faulty
A / C controller and its circuit faulty
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.
Cool air won’t come out
(A / C compressor won’t
operative) Magnet clutch faulty
Compressor relay faulty
Compressor thermal switch faulty
(if equipped)
Drive belt loose or broken
Compressor faulty
A / C ON permission signal in ECM
faulty
A / C controller faulty
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.
Cool air won’t come out
(A / C condenser cooling
fan motor won’t
operative) Condenser cooling fan relay faulty
Wiring or grounding faulty
“A / C condenser cooling fan relay”
signal in ECM faulty
Condenser cooling fan motor faulty
Check condenser cooling fan relay.
Repair as necessary.
Check A / C condenser cooling fan relay
signal.
Check condenser cooling fan motor.
Cool air won’t come out
(Blower motor won’t
operative) Fuse blown
Blower motor relay faulty
Blower motor resistor faulty
Blower motor switch faulty
Wiring or grounding faulty
Blower motor faulty
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.
Cool air won’t come out
or insufficient cooling
(A / C system normal
operative) Insufficient or excessive charge of
refrigerant
Refrigerant leak in system
Condenser clogged
A / C evaporator clogged or frosted
A / C thermistor faulty
A / C controller faulty
Expansion valve faulty
Drive belt slipping
Magnetic clutch faulty
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.