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Suzuki SX4 Service Manual page 1010

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7B-16 Air Conditioning System: Manual Type
Abnormal Noise from Tubing
Condition
A droning noise is heard
from inside of the vehicle,
but not particularly
noticeable in engine
compartment
Abnormal Noise from Condenser Assembly
Condition
Considerable vibration in
condenser assembly
Abnormal Noise from Crankshaft Pulley
Condition
A large rattling noise is
heard at idle or sudden
acceleration
Abnormal Noise from Tension Pulley
Condition
Clattering noise is heard
from pulley
Pulley cranks upon
contact
Abnormal Noise from A/C Evaporator
Condition
Whistling sound is heard
from A/C evaporator
Abnormal Noise from Blower Motor
Condition
Blower motor emits a
chirping sound in
proportion to its speed of
rotation
Fluttering noise or large
droning noise is heard
from blower motor
Possible cause
Faulty tubing clamps
Resonance caused by pulsation from
variations in refrigerant pressure
Possible cause
Resonance from condenser assembly
bracket and body
Possible cause
Loosen crankshaft pulley bolt
Possible cause
Worn or damaged bearing
Cracked or loose bracket
Possible cause
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
Possible cause
Worn or damaged motor brushes or
commutator
Leaves or other debris introduced from
fresh air inlet to blower motor
Correction / Reference Item
Reposition clamps or increase the number of
clamps.
Attach a silencer to tubing, or modify its
position and length.
Correction / Reference Item
Firmly insert a silencer between condenser
assembly bracket and body.
Correction / Reference Item
Retighten bolt.
Correction / Reference Item
Replace tension pulley.
Replace or retighten bracket.
Correction / Reference Item
At times, slightly decreasing refrigerant volume
may stop this noise.
Inspect expansion valve and replace if faulty.
Correction / Reference Item
Replace blower motor.
Remove debris and make sure that the screen
at fresh air inlet is intact.

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