946 / 1002
HVAC
36
Step
Inspection
Action
11
Verify whether malfunction is
in a/c compressor or else-
where
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 system 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 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 else-
where Is noise heard
immediately after A/C com-
pressor 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
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 refrig-
erant lines
Is noise emitted from A/C
compressor?
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 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.