1998 SUZUKI GRAND VITARA tem

YH4
GRAND
VITARA
1B-6 AIR CONDITIONING (OPTIONAL)
DIAGNOSIS
GENERAL
ConditionPossible CauseCorrection
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 faultyRecover, evacuation and charging.
Check ªIG METERº fuse, ªREAR DEFGº
fuse, and ªA / C FUSEº 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 faultyCheck 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

ªA / C condenser cooling fan relayº
signal in ECM faulty

Condenser cooling fan motor faultyCheck 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 faultyCheck ªHEATER FUSEº, ªREAR DEFGº
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 faultyCheck 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.

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-7
ConditionPossible CauseCorrection
Cool air does not come
out or insufficient
cooling (A / C system
normal operative)
Compressor faulty

Air in A / C system

Air leaking from cooling unit or air
duct

Heater and ventilation system faulty

Blower motor faulty

Excessive compressor oil existing in
A / C systemCheck compressor.
Replace condenser dryer, and
evacuation and charging.
Repair as necessary.
Check blower unit.
Check heater control lever assembly.
Check heater assembly.
Check blower motor.
Pull out compressor oil in A / C system
circuit, and replace compressor.
Cool air does not comes
out only intermittently
Wiring connection faulty

Expansion valve faulty

Excessive moisture in A / C system

A / C controller faulty

Magnetic clutch faulty

Excessive charge of refrigerantRepair as necessary.
Check expansion valve.
Replace condenser dryer, and
evacuation and charging.
Check A / C controller.
Check magnetic clutch.
Check charge of refrigerant.
Cool air comes out only
at high speeds
Condenser clogged

Insufficient charge of refrigerant

Air in A / C system

Drive belt slipping

Compressor faultyCheck condenser.
Check charge of refrigerant.
Replace condenser dryer, and
evacuation and charging.
Adjust or replace drive belt.
Check compressor.
Cool air does not comes
out only at high speeds
Excessive charge of refrigerant

A / C evaporator frostedCheck charge refrigerant.
Check A / C evaporator.
Check A / C thermistor.
Insufficient velocity of
cooled air
A / C evaporator clogged or frosted

Air leaking from cooling unit or air
duct

Blower motor faulty

Wiring or grounding faultyCheck A / C evaporator.
Repair as necessary.
Check blower motor.
Repair as necessary.

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-9
ABNORMAL NOISE FROM CRANKSHAFT PULLEY
ConditionPossible CauseCorrection

A large rattling noise is heard at
idle or sudden acceleration.
Loosen pulley mounting bolt.

Worn or broken bearings.
Retighten bolt.

Replace bearings.
ABNORMAL NOISE FROM TENSION PULLEY
ConditionPossible CauseCorrection

Clattering noise is heard from
pulley.

Pulley cranks upon contact.
Worn or damaged bearings.

Cracked or loose bracket.
Replace bearings.

Replace or retighten bracket.
ABNORMAL NOISE FROM EVAPORATOR
ConditionPossible CauseCorrection

Whistling sound is heard from
evaporator.
Depending on the combination of
the interior / exterior
temperatures, engine rpm and
refrigerant pressure, the
refrigerant flowing out of the
expansion valve may, under
certain conditions, make a
whistling sound.
At times, slightly decreasing
refrigerant volume may stop this
noise.

Inspect expansion valve and
replace if faulty.
ABNORMAL NOISE FROM BLOWER MOTOR
ConditionPossible CauseCorrection

Blower motor emits a chirping
sound in proportion to its speed of
rotation.

Fluttering noise or large droning
noise is heard from blower motor.
Worn or damaged motor brushes
or commutator.

Leaves or other debris
introduced from fresh air inlet to
blower motor.
Repair or replace blower motor.

Remove debris and make sure
that the screen at fresh air inlet is
intact.

YH4
GRAND
VITARA
3. Bubbles
1B-10 AIR CONDITIONING (OPTIONAL)
QUICKLY CHECKING OF REFRIGERANT
CHARGE (IF EQUIPPED WITH SIGHT GLASS)
CHARGE OF REFRIGERANT
The following procedure can be used for quickly checking whether
the A / C system has a proper charge of refrigerant or not.
Run engine at fast idle, and operate A / C at its max. cooling capacity
for a few minutes. Then, look at the sight glass (1) on receiver / dryer
(2) and compare what is observed with the symptoms listed in
ªCHECKING REFRIGERANT CHARGEº table given below.
CHECKING REFRIGERANT CHARGE
CONDITIONPOSSIBLE CAUSESCORRECTION
Bubbles observed in sight glassInsufficient charge of refrigerant in
systemCheck system for leaks with a leak
tester.
No bubbles observed in sight glassNo charge or proper or too much
charge of refrigerant in systemRefer to the following item.
No temperature difference
between compressor inlet and
outletEmpty or nearly empty systemRecovery, evacuate and charge
system and then check it for leaks
with a leak tester.
Noticeable temperature difference
between compressor inlet and
outletProper or too much charge of
refrigerant in systemRefer to the following item.
When A / C is turned OFF,
refrigerant in sight glass clears
immediately and remains clearToo much charge of refrigerant in
systemDischarge excess charge of
refrigerant to adjust it to a specified
charge.
When A / C is turned OFF,
refrigerant in sight glass once
produces bubbles and then clearsProper charge of refrigerant in
systemNo correction needed because
charge of refrigerant is normal.

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-11
COMPRESSION SYSTEM DIAGNOSIS
Compressor troubles are mainly following three types: gas leakage, noise and insufficient pressure.
Compressor gas leakages in most cases develop from the shaft seal. When detecting gas leakage, always use
a leak tester. If a small amount of oil seeps out from the shaft seal, there is no necessity of replacing the seal. The
shaft seal has been designed to allow a small amount of oil to leak out for lubricating purpose. Thus, the shaft seal
should be replaced only when a large amount of compressor oil is leaking out or when gas leakage is discovered
by using gas tester.
In regard to noise and insufficient pressure, repairs should be made only after diagnosing the trouble properly.
CONDITION
POSSIBLE CAUSESCORRECTION
Noise from compressor
Defective bearing

Defective cylinder and / or shaftReplace.
Replace.
Noise from magnetic clutch
Defective bearing

Defective clutch faceReplace.
Replace.
Insufficient cooling
Defective gasketReplace.

Defective reed valveReplace.
Not rotating
Locked compressor

Seized magnetic clutch

Rotating parts seized by insufficient oil
amountReplace.
Replace.
Replace.
Oil and / or gas leakage
Defective seal

Defective O-ringReplace.
Replace.

YH4
GRAND
VITARA
For CAMI production vehicle
For IWATA production vehicle
1B-12 AIR CONDITIONING (OPTIONAL)
PERFORMANCE DIAGNOSIS
1) Confirm that vehicle and environmental conditions are as fol-
lows.

Vehicle is not exposed to direct sun.

Ambient temperature is within 15C ± 35C (59F ± 95F).
2) Make sure that high pressure valve (1) and low pressure valve
(2) of manifold gauge are firmly closed.
3) Connect high pressure charging hose (3) to high pressure ser-
vice valve (5) on vehicle, and connect low pressure charging
hose (4) to low pressure service valve (6) on vehicle.
4) Bleed the air in charging hoses (3), (4) by loosening their respec-
tive nuts on manifold gauge, utilizing the refrigerant pressure.
When a hiss is heard, immediately tighten nut.
CAUTION:
Do not interchange high and low pressure charging
hoses by mistake.
5) Warm up engine to normal operating temperature (engine cool-
ant temperature at 80 ± 90C (176 ± 194F)) and keep it at spe-
cified idle speed. (Radiator cooling fan should not be working
when checking pressure and temperature.)
6) Turn A / C switch ON, and set blower switch at ªHIº (4th position),
temperature control knob at ªCOOLº, air outlet control knob at
ªFACEº, fresh / circulation control knob at ªCIRCULATIONº.
(Confirm that A / C compressor and condenser fan are working.)
7) Keep all windows, doors and engine food open.
Ambient temperature
15 ± 35C (59F ± 95F)
Engine rpmKeep to 1,500 rpm.
Blower motor switchMax. (4th position)
Temperature controlMax. cool
Air outlet controlFace
Vehicle doorsAll open
Air inlet door positionRecirculation
8) With about 20 mm (0.8 in.) of dry bulb thermometer (1) inserted
into center duct air outlet and another one set near evaporator
air inlet, read temperature indicated on each thermometer.

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-13
9) Check for each pressure of low side and high side if it is within
shaded range of graph.
If each gauge reading is out of specified pressure, correct de-
fective part referring to following Test Diagnosis table.
Example:
Gauges should read as follows when ambient
temperature is 30
C.
Pressure on high pressure
gauge (HI):1400 ± 1750 kPa
14.0 ± 17.5 kg / cm
2
Pressure on high pressure
gauge (LO):230 ± 350 kPa
2.3 ± 3.5 kg / cm
2
NOTE:
Pressure registered on gauge varies with ambient temper-
ature. Therefore, use left graphs when determining if pres-
sures are normal or not.
10) Check inlet port temperature-to-outlet port temperature rela-
tionship using graph.
For example, if evaporator inlet port temperature is 25
C
(77
F) and center duct air outlet temperature is 8
C (46.4
F),
their crossing point is within acceptable range as shown in
graph.
11) If crossing point is out of acceptable range, diagnose trouble
referring to following Performance Diagnosis table.

YH4
GRAND
VITARA
1B-14 AIR CONDITIONING (OPTIONAL)
HIGH PRESSURE CAUGE LOW PRESSURE GAUGE THERMOMETER AT
CENTER DUCT
Insufficient
cooling of
condenser
PERFORMANCE DIAGNOSIS TABLE
TESTING RESULTSPOSSIBLE CAUSEREMEDY
Pressure high
(ªAº area of high side
graph)
Refrigerant overcharged

Expansion valve frozen or clogged

Clogged refrigerant passage of high side

Condenser fan malfunction

Dirty or bent condenser fins

Compressor malfunction (Insufficient oil etc.)

Engine overheat
Recharge

Check expansion valve

Clean or replace

Check condenser fan

Clean or repair

Check compressor

Check engine cooling
system
Pressure low
(ªBº area of high side
graph)
Insufficient refrigerant (Insufficient charge or
leakage)

Expansion valve malfunction (Valve opens too
wide)

Compressor malfunction (Insufficient
compression)
Check for leakage, repair if
necessary and recharge

Check expansion valve

Check compressor
Pressure high
(ªAº area of low side
graph)
Expansion valve malfunction (Valve opens too
wide)

Compressor malfunction (Insufficient
compression)
Check expansion valve

Check compressor
Pressure low
(ªBº area of low side
graph)
Insufficient refrigerant (Insufficient charge or
leakage)

Expansion valve malfunction (Valve opens too
narrow)

Clogged refrigerant passage (Crashed pipe)
Check for leakage, repair if
necessary and recharge

Check expansion valve

Repair or replace
Outlet air temperature
at center duct is high
(Crossing point is in
area ªAº)
Insufficient or excessive charge of refrigerant

Dirty or bent evaporator fins

Air leakage from cooling (heater) unit or air
duct

Malfunctioning, switchover function of damper
in cooling (heater) unit

Compressor malfunction
Check refrigerant
pressure

Clean or repair

Repair or replace

Repair or replace

Check compressor
Outlet air temperature
at center duct is low
(Crossing point is in
area ªBº)
Insufficient air volume from center duct
(Heater blower malfunction)

Compressor malfunction
Check blower motor and
fan

Check compressor
NOTE:
If ambient temperature is within 30 ± 35C (85 ± 95F), it is possible to do using next page table for more
detail diagnosis.