DIAGNOSTIC PROCEDURE
NO.10 NOISE WHILE OPERATING A/C SYSTEM DIAGNOSTIC PROCEDURE
DESCRIPTION
z
Noise from magnetic clutch, A/C compressor, hose or refrigerant line.
POSSIBLE CAUSE
z
Magnetic clutch operation noise
z
A/C compressor vane noise
z
A/C compressor slippage noise
z
Hose or refrigerant line interference noise
STEP
INSPECTION
ACTION
1
CHECK A/C COMPRESSOR VANE
NOISE
z
Is there a jingling, popping, beeping,
or buzzing sound (A/C compressor
vane noise)?
Yes Go to Step 5.
No
Go to the next step.
2
INSPECT A/C COMPRESSOR
SLIPPAGE NOISE
z
Is there a squeaking or whirling
sound (A/C compressor slippage
noise)?
Yes Go to Step 14.
No
Go to the next step.
3
INSPECT A/C COMPRESSOR
INTERFERENCE NOISE
z
Is there a rattling or vibrating sound
(interference noise)?
Yes Go to Step 18.
No
Go to the next step.
4
INSPECT MAGNETIC CLUTCH
OPERATION NOISE
z
Is there a clicking sound (magnetic
clutch operation noise)?
Yes
Adjust clearance between pressure plate of
magnetic clutch and A/C compressor pulley, then
go to Step 19.
(See
MAGNETIC CLUTCH
ADJUSTMENT
.)
No
Condition is normal. (Recheck malfunction
symptoms.)
5
INSPECT A/C COMPRESSOR NOISE
TIME
z
Is noise heard continuously for more
than 3 s after A/C compressor comes
on?
Yes Go to the next step.
No
Condition is normal. (Noise occurs for
2-3 s
immediately after A/C compressor turns on.)
INSPECT IDLE SPEED
z
Inspect idle speed.
Yes Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 HVAC Symptom Troubleshooting (HVAC) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:14:51 AM
Page 30
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