U–78
TROUBLESHOOTING
* : If there is gas leakage, air enters into the A/C system. The desiccant within the receiver/drier absorbs the
moisture from the air and becomes saturated. If the A/C system is used in this condition, the inside of the A/C
compressor will begin to rust due to this moisture, which may cause lock up or noise to occur. Therefore,
replacement of the receiver/drier is necessary.
End Of Sie
13 INSPECT A/C COMPRESSOR OIL
• Is compressor oil darker than normal and
contaminated with aluminum chips?
Yes Replace A/C compressor and condenser, then go to Step
19. (Since A/C compressor may be worn and receiver/drier
may be clogged, replacement of receiver/drier is
necessary.)
No Condition is normal. Recheck malfunction symptoms.
14 CHECK TO SEE WHETHER MALFUNCTION
IS IN A/C COMPRESSOR OR ELSEWHERE
• Is noise heard immediately after A/C
compressor is stopped?
Yes Replace A/C compressor, then go to Step 19. (A/C
compressor discharge valve left open)
No Go to next step.
15 INSPECT DRIVE BELT
• Inspect drive belt.
(See B–3 DRIVE BELT INSPECTION)
• Is it okay?
Yes Go to next step.
No Adjust or replace drive belt, then go to Step 19.
16 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 19.
No Go to next step.
17 INSPECT MAGNETIC CLUTCH
• Inspect magnetic clutch.
(See U–38 MAGNETIC CLUTCH
INSPECTION)
• Is it okay?
Yes Replace A/C compressor (excluding pressure plate, A/C
compressor pulley, and stator), then go to Step 19.
No Replace magnetic clutch, then go to Step 19.
18 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.
19 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.
STEP INSPECTION ACTION
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