Abnormal Noise Diagnosis - Suzuki Ignis Service Manual

ABNORMAL NOISE DIAGNOSIS

There are various types of noise, ranging from those produced in the engine compartment to those from the
passenger compartment, also from rumbling noises to whistling noises.
ABNORMAL NOISE FROM COMPRESSOR
Condition
During compressor
operation, a rumbling
noise is heard propor-
tional to engine
revolutions.
A loud noise is heard
at a certain rpm, dis-
proportionately to
engine revolution.
A loud rattle is heard
at low engine rpm.
ABNORMAL NOISE FROM MAGNETIC CLUTCH
Condition
A rumbling noise is
heard when compres-
sor is not operating.
A chattering noise is
heard when compres-
sor is engaged.
ABNORMAL NOISE FROM TUBING
Condition
A droning noise is
heard inside vehicle,
but not particularly
noticeable in engine
compartment.
ABNORMAL NOISE FROM CONDENSER
Condition
Considerable vibra-
tion in condenser.
Possible Cause
Inadequate clearance in piston area (piston or
swash-plate)
Loose or faulty compressor drive belt
Loose compressor mounting bolts
Loose compressor clutch plate bolt
Possible Cause
Worn or damaged bearings
Faulty clutch clearance (excessive)
Worn clutch friction surface
Compressor oil leaked from lip type seal, con-
taminating the friction surface
Possible Cause
Faulty tubing clamps
Resonance caused by pulsation from variations
in refrigerant pressure
Possible Cause
Resonance from condenser bracket and body
AIR CONDITIONING (OPTIONAL) 1B-7
Correction
Repair or replace compressor as
necessary.
Adjust drive belt tension, or replace
drive belt.
Retighten mounting bolts.
Retighten clutch plate bolt.
Replace compressor if it was oper-
ated in this condition for a long
time.
Correction
Replace magnet clutch assembly.
Adjust clutch clearance.
Replace magnet clutch assembly.
Replace compressor body assem-
bly.
Correction
Reposition clamps or increase the
number of clamps.
Attach a silencer to tubing, or mod-
ify its position and length.
Correction
Firmly insert a silencer between
condenser bracket and body.