Suzuki Grand Vitara 1998, Service Manual

Page: 80 / 801

YH4
GRAND
VITARA
AIR CONDITIONING (OPTIONAL) 1B-9
ABNORMAL NOISE FROM CRANKSHAFT PULLEY
Condition Possible Cause Correction
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
Condition Possible Cause Correction
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
Condition Possible Cause Correction
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
Condition Possible Cause Correction
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.