AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 181 -
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
5. A/C system actuator noise diagnosis.
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
Finish the settings below:
B lower motor speed
Air heater, ventilation and A/C system modes
Temperature control setting
③ Define the noise types:
Scraping , bang
T ick/click , chirp or creak
W hish/howling
Is the scraping or bang obvious during mode selection or temperature
setting?
Go to Step 6. Go to Step 3.
3
W hen the blower motor speed reduces, is there still tick/click
、
chirp,
squeak or scraping but with lower sound?
Go to Step 6. Go to Step 4.
4
Is whish/howling obvious under every mode but not so under every
temperature setting?
Go to Step 6. Go to Step 5.
5
Is there obvious whish/howling only under “ DEFROST ” or “ FLOOR ”
mode ？
Go to Step 6. Go to Step 6.
6
Remove the instrument panel bracket.
① Check damper for normal operation.
② Check air duct for blockage or foreign matter.
D oes any of the above condition occur?
Go to Step 9. Go to Step 7.
7
Check modes, temperature damper s and seals for warpage or crack.
I s the damper under normal status?
Go to Step 10. Go to Step 8.
8
Replace relevant dampers and/or seals.
Is the maintenance finished?
Go to Step 10. —
9
Remove obstruction or foreign matter.
Is the operation finished?
Go to Step 10. —
10
Install the instrument panel bracket.
Is the operation finished?
Go to Step 11. —
11
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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