AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 178 -
Diagnosis
Diagnosis
Diagnosis
Diagnosis and
and
and
and Testing
Testing
Testing
Testing
A/C
A/C
A/C
A/C system
system
system
system performance
performance
performance
performance diagnosis
diagnosis
diagnosis
diagnosis
2. Insufficient defrosting.
Step Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “ symptoms ” or
instruction of other diagnosis tables?
Go to Step 2. —
2
① Start the engine.
②
Select “ DEFROST ” mode.
③ Set the maximum speed of blower.
Is there sufficient airflow from defroster outlet?
Go to Step 3. Go to Step 10.
3
Measure the operating temperature of engine.
Does the engine temperature reach normal operating temperature?
Go to Step 4. Go to Step 8.
4
①
Set the minimum speed of blower.
② Set the warmest temperature.
③
Sense the temperature of inlet and outlet hoses at the heater core.
Is the inlet hose of heater warmer than the outlet hose?
Go to Step 11. Go to Step 5.
5
Test the operation of A/C compressor.
Does the A/C compressor run?
Go to Step 7. Go to Step 6.
6
Replace the A/C compressor.
Is the maintenance finished?
Go to Step 14. —
7
Conduct A/C system performance test.
Does the operation of A/C system meet the requirements?
Go to Step 9. Go to Step 12.
8
Troubeshoot too low engine temperature.
Is the maintenance finished?
Go to Step 14. —
9
Check whether the internal circulation damper operates normally.
Does the internal circulation damper operate normally?
Go to Step 14. Go to Step 13.
10
Conduct troubleshooting for air outlet.
Is the maintenance finished?
Go to Step 14. —
11
Conduct troubleshooting for air heater.
Is the maintenance finished?
Go to Step 14. —
12
Conduct troubleshooting on A/C performance.
Is the maintenance finished?
Go to Step 14. —
13
Conduct troubleshooting for internal circulation damper .
Is the maintenance finished?
Go to Step 14. —
14
Run the system to check the maintenance result.
Is the fault detected and eliminated?
System is normal. Go to Step 2.
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