AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 190 -
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
13. Fault diagnosis of internal/external circulation.
Step Operation
Yes
No
9
Check internal circulation damper and internal circulation actuator for:
Dislocation of circulation actuator.
L inkage fractured or stuck.
I nternal circulation damper fractured or stuck.
O bstacle blocking the internal circulation damper moving within the
whole range.
L ack of internal circulation damper seals.
D islocation of internal circulation damper seals.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 10.
10
C heck the harness connector of internal circulation actuator for poor
contact.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 13.
11
Check the harness connector of air heater, ventilation and A/C system
control module for poor contact.
Is the fault detected and eliminated?
Go to Step 15. Go to Step 14.
12
R epair the ignition voltage circuit of internal circulation actuator .
I s the repair finished?
Go to Step 15. —
13
R eplace the internal circulation actuator .
Is the replacement finished?
Go to Step 15. —
14
Replace air heater, ventilation and A/C system control module.
Is the replacement finished?
Go to Step 15. —
15
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal. Go to Step 2.
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