902 / 1980
HVAC
849
HVAC
3 Noise while operating A/C system
TROUBLESHOOTINGHINTS
• Magnetic clutch operation noise
Step 4
• A/C compressor vane noise
Step 5-13
• A/C compressor slippage noise
Step 14-17
• Hose or refrigerant line interference noise
Step 18
INSPECT A/C COMPRESSOR VANE
NOISE
Is there a jingling, popping, beeping, or
buzzing sound (A/C compressor vane
noise) ?
INSPECT A/C COMPRESSOR
SLIPPAGE NOISE
Is there a squeaking or whirling sound
(A/C compressor slippage noise) ?
INSPECTA/C COMPRESSOR
INTERFERENCENOISE
Is there a ratting or vibrating sound
(interference noise) ?
INSPECT MAGNETIC CLUTCH
OPERATIONNOISE
Is there clicking sound (magnetic clutch
operation noise) ?
INSPECTA/C COMPRESSOR NOISE
TIME
Is noise heard continuously for more
than 3 seconds after A/C compressor
comes on?
INSPECT IDLE SPEED
Is it okay?
INSPECT REFRIGERANTAMOUNT
Inspect refrigerant amount.
See REFRIGERANT SYSTEM
SERVICE
PROCEDURES,
REFRIGERANT CHARGE CHECK
Is it okay?
Go to Step 5.
Go to next step.
Go to Step 14.
Go to next step.
Go to Step 18.
Go to next step.
Adjust clearance between pressure plate
of magnetic clutch and A/C compressor
pulley, then go to Step 19.
Condition is normal. (Recheck
malfunction symptoms.)
Go to next step,
Condition is normal. (Noise occurs for 2-
3 seconds immediately after A/C
compressor turns on.)
Go to next step.
Adjust idle speed, then go to Step 19.
Go to Step 10.
Go to next step.
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
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STEP INSPECTION
ACTION