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HVAC
27
Step
Inspection
Action
8
Verify whether malfunction is in expan-
sion valve or receiver/drier. Turn A/C
switch off and air conditioner stop for 10
minutes start engine turn both A/C switch
and fan switch on. Does malfunction oc-
cur 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 satu-
rated, replacement is necessary.)
9
Verify that expansion valve heat-sensing
tube within cooling unit is positioned se-
curely and correctly is expansion valve
heat-sensing tube within cooling unit se-
curely installed in proper position?
Yes
Replace expansion valve.
(Since valve closes
too much replacement is necessary.)
No
Install heat-sensing tube securely in proper
position.
10
Inspect refrigerant lines
Is piping free of damage and cracks?
Are piping connections free of oil
grime? (visual inspection)
Are piping installation points on a/c
compressor free of gas leakage?
Are piping installation 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 an A/C component is damaged or
cracked, replace it.
11
Inspect evaporator piping connections 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 refriger-
ant 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 connections 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.
13
Inspect piping connections for looseness
Are piping connections loose?
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 com-
pressor oil to the A/C compressor.
Verify that the noise is no longer heard. Adjust
refrigerant to specified amounts.