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FATC
31
STEP
INSPECTION
ACTION
13
Inspect piping connections for loose-
ness ?
Yes
Tighten connections to specified torque. If
the vane makes a noise, add 10ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to specified amounts.
No
If the vane makes a noise, add 10ml of
compressor oil to the A/C compressor.
Verify that the noise is no longer heard.
Adjust refrigerant to specified amounts.
14
Verify whether malfunction is in expan-
sion valve, air mix and compressor oil or
elsewhere does refrigerant’s high-
pressure value hardly increases?
Yes
Go to next step.
(Pressure hardly increases.)
No
Go to step 17.
15
Verify whether a malfunction is in com-
pressor oil amount and a/c compressor
or elsewhere when engine is racing,
does high pressure value increase?
Yes
Return to step 3.
No
Go to next step
16
Verify whether malfunctions is in com-
pressor oil amount or a/c compressor
after compressor oil is replenished each
10 ml, does high pressure value in-
crease?
Yes
Troubleshooting completed.
(Explain to
customer that cause was insufficient
compressor oil.)
No
Replace A/C compressor.
(Cause is de-
fective AC compressor)
17
Verify whether malfunction is in expan-
sion valve or elsewhere is only
refrigerant low-pressure value high?
Yes
Go to step 20.
No
Go to next step
18
Verify that air mix is installed securely
and properly are heater unit’s air mix
links, air mix cranks and air mix rods
securely and properly installed?
Yes
Go to next step
No
Repair or install links, cranks and rods
securely in proper position
19
Verify that expansion valve heat sens-
ing tube within cooling unit is positioned
securely and correctly is expansion
valve heat-sensing tube within cooling
unit securely installed in proper posi-
tion?
Yes
Replace expansion valve, then go to next
step. (Since valve opens too much, re-
placement is necessary.
No
Install heat-sensing tube securely in prop-
er position, then go to next step.
20
Verify that malfunction symptom occurs
after repair does cool air blow out? (Are
results of refrigerant system perfor-
mance test okay?)
Yes
Troubleshooting completed. Explain re-
pairs to customer.
No
Recheck malfunction symptoms, then re-
peat from step 1 if malfunction recurs.