Suzuki Liana RH413, Service Manual

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7B-9 Air Conditioning System: Manual Type
Abnormal Noise Symptom Diagnosis of A/C System
S3RH0A7214002
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
Abnormal Noise from Magnetic Clutch
Cool air comes out only at
high speed Condenser clogged Check condenser referring to “Condenser
Assembly Inspection”.
Insufficient charge of refrigerant Check amount of refrigerant charged.
Air in A/C system Replace desiccant, and perform evacuation
and charging.
Compressor drive belt loosen or broken Replace compressor drive belt.
Compressor faulty Check compressor.
Cool air does not come
out only at high speed Excessive charge of refrigerant Check amount of refrigerant charged.
A/C evaporator frosted Check A/C evaporator and A/C evaporator
outlet air temperature sensor referring to “A/C
Evaporator Inspection” and “A/C Evaporator
Inlet and Outlet Air Temperature Sensors
Inspection”.
Insufficient velocity of
cooled air A/C evaporator clogged or frosted Check A/C evaporator and A/C evaporator
outlet air temperature sensor referring to “A/C
Evaporator Inspection” and “A/C Evaporator
Inlet and Outlet Air Temperature Sensors
Inspection”.
Air leaking from cooling unit or air duct Repair as necessary.
Blower motor faulty Check blower motor referring to “Blower Motor
Inspection in Section 7A”.
Wiring or grounding faulty Check wiring and grounding.
Condition Possible cause Correction / Reference Item
Condition Possible cause Correction / Reference Item
Compressor: During
compressor operation, a
rumbling noise is heard
proportional to engine
revolutions. Inadequate clearance in piston area
(piston or swash-plate) Repair or replace compressor as necessary.
Compressor: A loud noise
is heard at a certain rpm,
disproportionately to
engine revolution. Loose or faulty compressor drive belt Replace drive belt.
Loose compressor mounting bolts Retighten mounting bolts.
Compressor: A loud rattle
is heard at low engine
rpm. Loose compressor clutch plate bolt Retighten clutch plate bolt.
Replace compressor if it was operated in this
condition for a long time.
Condition Possible cause Correction / Reference Item
Magnet Clutch: A
rumbling noise is heard
when compressor is not
operating. Worn or damaged bearings Replace magnet clutch assembly.
Magnet Clutch: A
chattering noise is heard
when compressor is
engaged. Faulty clutch clearance (excessive) Adjust clutch clearance.
Worn clutch friction surface Replace magnet clutch assembly.
Compressor oil leaked from shaft seal,
contaminating the friction surface Replace compressor body assembly.