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HVAC
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10
Verify whether malfunction is in compressor oil or
elsewhere
Add 30 ml of compressor oil. Is noise heard when
racing engine?
Yes Go to next step.
No
Troubleshooting completed.
Explain repair to customer.
11
Verify whether malfunction is in A/C compressor or
elsewhere
Drain compressor oil. Is it contaminated with metal
particles?
Yes Go to next Step.
No
Replace A/C compressor, then go to
Step 19.
12
Verify whether malfunction is somewhere in a/c sys-
tem or elsewhere
Is compressor oil whitish and mixed with water?
Yes
Replace entire A/C system
(Excluding
heater),
then go to Step 19.
No Go to next step.
13
Inspect A/C compressor oil
Is compressor oil darker than normal and contami-
nated with aluminum chips?
Yes
Replace A/C compressor and con-
denser, then go to Step 19
(Since A/C
compressor may be worn and receiv-
er/drier may be clogged, replacement
of receiver/drier is necessary.)
No
Condition is normal. Recheck mal-
function symptoms.
14
Verify 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
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 gave
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.
Is it okay?
Yes
Replace A/C compressor, go to Step
19.
No
Replace A/C compressor, then go to
Step 19.
18
Verify whether malfunction is in A/C compressor or
refrigerant lines
Is noise emitted from A/C compressor?
Yes
Visually inspect A/C compressor, re-
place appropriate parts if necessary,
then go to next step.
No
If noise is due to refrigerant lines, re-
pair 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.
No
Explain repairs to customer. Recheck
malfunction symptoms, then repeat
from Step 1 if malfunction recurs.