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HVAC
33
Step
Inspection
Action
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 symp-
toms.
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 im-
bedded 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
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 com-
pressor?
Yes
Visually inspect A/C compressor, replace appro-
priate parts if necessary, then go to next step.
No
If noise is due to refrigerant lines, repair de-
tached 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 malfunc-
tion symptoms, then repeat from Step 1 if
malfunction recurs.