AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 179 -
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
3. Blower motor 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
Check if there is any chip at air inlet grille.
Is there any chip?
Go to Step 8. Go to Step 3.
3
1.Sit in the vehicle.
2.Close doors and windows.
3.Turn the ignition switch to ON position with the engine off.
4. Run the blower motor at every speed and mode to determine the time
and place of noise generating.
Is the noise under operation of blower is obvious?
Go to Step 4. Go to Step 11.
4
Touch the blower casing to check for vibration when the blower motor
operating at different speed.
Is there any overvibration?
Go to Step 6. Go to Step 5.
5
Listen to the sound of blower motor at different speed.
Is there any abnormal noise such as squeak or chirp?
Go to Step 9. Go to Step 11.
6
1. Remove the blower motor.
2. Check the blower motor impeller for any abnormal deposition.
3. Check the blower motor for any abnormal deposition.
Do you fin d any foreign matter on blower motor or blower motor
impeller?
Go to Step 8. Go to Step 7.
7
Check blower motor for:
V
ane crack.
L ooseness of impeller fasteners.
Improper positioning of impeller.
Do you find any abnormality mentioned above?
Go to Step 9. Go to Step 10.
8
Clear foreign matter.
Is the operation finished?
Go to Step 10. —
9
Replace blower motor.
Is the maintenance finished?
Go to Step 11. —
10
Install blower motor.
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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