A/C System Performance Inspection - Suzuki Swift Sport 2004 Service & Repair Manual

7B-10 Air Conditioning System: Manual Type
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

A/C System Performance Inspection

1) Confirm that vehicle and environmental conditions
are as follows.
• Vehicle is put indoors.
• Ambient temperature is within 25 – 35 °C (77 – 95
°F).
• Relative humidity is within 30 – 70%.
• There is no wind indoors.
• HVAC unit is normal.
• Blower motor is normal.
• There is no air leakage from air ducts.
• Condenser fins are clean.
• Air filter in HVAC unit is not clogged with dirt and
dust.
• Battery voltage is about 12 V.
• Radiator cooling fan operates normally.
2) Make sure that high pressure valve (1) and low
pressure valve (2) of manifold gauge are firmly
closed.
3) Connect high pressure charging hose (3) to high
pressure service valve (5) on vehicle and low
pressure charging hose (4) to low pressure service
valve (6).
4) Bleed the air in charging hoses (3) and (4) by
loosening their nuts respectively utilizing the
refrigerant pressure. When a hissing sound is heard,
immediately tighten nut.
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
S7RS0B7214003
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.
CAUTION
!
Do not connect high and low pressure
charging hoses in reverse.
2
3
5
1
4
6
I4RS0A720006-01