1194 / 1236
HVAC
36
Step
Inspection
Action
7
Verify whether malfunction is in
expansion valve and receiver
/drier or elsewhere immediately
after A/C compressor operates,
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-pressure
value momentarily rise to correct
value, then fall and stay below it?
(Is there negative pressure on
low-pressure side?)
Yes
Go to next step
No
Go to step 10.
8
Verify whether malfunction is in
expansion valve or receiver/drier.
Turn A/C switch off and air condi-
tioner stop for 10 minutes start
engine turn both A/C switch and
fan switch on. Does malfunction
occur after compressor turn on?
Yes
Go to next step
No
Replace condenser and vacuum refrigerant line
more than 30 minutes by vacuum pump, and
refrigerant to specified level.
(Since water has
intermixed in receiver/drier and it is saturated,
replacement is necessary.)
9
Verify that expansion valve heat-
sensing tube within cooling unit is
positioned securely and correctly
is expansion valve heat-sensing
tube within cooling unit securely
installed in proper position?
Yes
Replace expansion valve.
(Since valve closes
too much replacement is necessary.)
No
Install heat-sensing tube securely in proper po-
sition.
10
Inspect refrigerant lines
x
Is piping free of damage and
cracks?
x
Are piping connections free of
oil grime? (visual inspection)
x
Are piping installation points on
a/c compressor free of gas
leakage?
x
Are piping installation on cool-
ing unit free of gas leakage?
x
Perform gas leak inspection
using gas leak tester.
Are above items okay?
Yes
Go to next step
No
If piping or an A/C component is damaged or
cracked, replace it.
11
Inspect evaporator piping connec-
tions in cooling unit for gas
leakage Are piping connections
for evaporator in cooling unit free
of gas leakage?
Yes
If the vane makes a noise, add 10ml of com-
pressor oil to the A/C compressor. Verify that
the noise is no longer heard. Adjust refrigerant
to specified amounts.
No
If piping is damaged or cracked, replace it.
If there is no damage, go to next step.
12
Inspect evaporator piping connec-
tions in cooling unit for looseness
Yes
Tighten connections to specified torque.
If the vane makes a noise, add 10 ml of com-
pressor 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 10 ml of com-
pressor oil to the A/C compressor.
Verify that the noise is no longer heard. Re-
place O-ring on piping, adjust refrigerant to
specified amounts.