548 / 745
FATC
39
8
Inspect refrigerant line
Is piping free of damage and cracks?
Are piping connections free of oil grime?
(Visual Inspection)
Are piping connections free of gas leak-
age?
Are piping installation points on con-
dense free of gas leakage?
Are piping installation points on receiv-
er/drier free of gas leakage?
Are piping installation pints on A/C
Compressor free of gas leakage?
Are piping installation points on cooling
unit free of gas leakage.
Perform gas leak inspection using gas
leak tester.
Are above items okay?
Yes
Go to next step.
No
If piping or A/C component
(s)
is damaged
or cracked, replace then go to Step
19.Ifthere is gas leakage, repair or replace
connection and replace condenser, then
go Step 19.
9
Inspect evaporator piping connections in
cooling unit for gas leakage
Are piping connections for evaporator in
cooling unit free of gas leakage?
Yes
Adjust refrigerant amount to specified lev-
el, then go to Step 19.
No
If piping damaged or cracked, replace then
go to Step 19.
If there is gas leakage, repair or replace
connection and replace condenser then go
to Step 19.
10
Verify whether malfunction is in compres-
sor 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 com-
pressor 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 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
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
Verify whether malfunction is in A/C com-
pressor 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.