Abnormal Noise Symptom Diagnosis Of A/C System - Suzuki SX4 Service Manual

Condition
Cool air does not come
out only at high speed
Insufficient air flow of
cooled air

Abnormal Noise Symptom Diagnosis of A/C System

Abnormal Noise from Compressor
Condition
During compressor
operation, a rumbling
noise is heard
proportional to engine
revolutions
A loud noise is heard at a
certain rpm,
disproportionately to
engine revolution
A loud rattle is heard at
low engine rpm
Abnormal Noise from Magnetic Clutch
Condition
A rumbling noise is heard
when compressor is not
in operation
A chattering noise is
heard when compressor
is in operation
Possible cause
Excessive amount of refrigerant
A/C evaporator frosted
A/C evaporator clogged or frosted
Air leaking from HVAC unit or air duct
Blower motor faulty
Wiring or grounding faulty
Possible cause
Inadequate clearance in scroll area
Loose or faulty compressor drive belt
Loose compressor mounting bolts
Loose compressor clutch plate bolt
Possible cause
Worn or damaged bearings
Faulty magnet clutch clearance
(excessive clearance)
Worn magnet clutch friction surface
Compressor oil leaked from shaft seal,
contaminating the friction surface
Air Conditioning System: Manual Type 7B-15
Correction / Reference Item
Check the amount of refrigerant.
Check A/C evaporator and evaporator
temperature sensor referring to "Evaporator
Inspection: Manual Type" and "Evaporator
Temperature Sensor Inspection: Manual Type".
Check A/C evaporator and evaporator
temperature sensor referring to "Evaporator
Inspection: Manual Type" and "Evaporator
Temperature Sensor Inspection: Manual Type".
Repair as necessary.
Check blower motor referring to "Blower Motor
Inspection in Section 7A".
Repair as necessary.
Correction / Reference Item
Replace compressor.
Adjust drive belt tension or replace drive belt.
Retighten mounting bolts.
Retighten clutch plate bolt.
Replace compressor if it was operated in this
condition for a long time.
Correction / Reference Item
Replace magnet clutch assembly.
Adjust magnet clutch clearance.
Replace magnet clutch assembly.
Replace compressor body assembly.
S7RW0A7214005