Diagnostic procedure
STEP
|
INSPECTION
|
ACTION
|
|
---|---|---|---|
1
|
INSPECT A/C COMPRESSOR SLIPPAGE NOISE
• Is there a squeaking or whirling sound (A/C compressor slippage noise)?
|
Yes
|
Go to Step 4.
|
No
|
Go to next step.
|
||
2
|
INSPECT A/C COMPRESSOR INTERFERENCE NOISE
• Is there a rattling or vibrating sound (interference noise)?
|
Yes
|
Go to Step 7.
|
No
|
Go to next step.
|
||
3
|
INSPECT MAGNETIC CLUTCH OPERATION NOISE
• 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 8.
|
No
|
Condition is normal. (Recheck malfunction symptoms.)
|
||
4
|
INSPECT DRIVE BELT
• Inspect drive belt.
• Is it normal?
|
Yes
|
Go to next step.
|
No
|
Adjust or replace drive belt, then go to Step 8.
|
||
5
|
INSPECT DRIVE BELT CONDITION
• Is drive belt worn?
• Does it have foreign material imbedded in it, or have oil on it?
|
Yes
|
Remove obstruction, remove oil, or replace drive belt, then go to Step 8.
|
No
|
Go to next step.
|
||
6
|
INSPECT MAGNETIC CLUTCH
• Inspect magnetic clutch.
• Is it normal?
|
Yes
|
Replace A/C compressor (excluding pressure plate, A/C compressor pulley, and stator), then go to Step 8. (See A/C COMPRESSOR REMOVAL/INSTALLATION.)
|
No
|
Replace magnetic clutch, then go to Step 8.
|
||
7
|
CHECK TO SEE WHETHER MALFUNCTION IS IN A/C COMPRESSOR OR REFRIGERANT LINES
• Is noise emitted from A/C compressor?
|
Yes
|
Visually inspect A/C compressor, replace appropriate parts if necessary, then go to next step.
|
No
|
If noise is due to refrigerant lines, repair detached or missing clips, tighten loose bolts, then go to next step.
|
||
8
|
VERIFY THAT MALFUNCTION SYMPTOM OCCURS AFTER REPAIR
• Has A/C compressor noise stopped?
|
Yes
|
Troubleshooting completed.
Explain repairs to customer.
|
No
|
Recheck malfunction symptoms, then repeat from Step 1 if malfunction recurs.
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