AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 182 -
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
6. Odour 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 Sit in the vehicle.
②
Close all doors and windows.
③ Start the engine.
④ Let the engine idling under normal operating temperature.
⑤ Set the maximum speed of blower.
⑥
Set the coldest temperature.
⑦ Run the A/C under every blower speed, mode and temperature to
determine what kind of odour (musty taste, smell of coolant or oil)
occurs.
Go to Step 3. Go to Step 8.
3
Check air heater, ventilation and A/C system module assembly filter and
air inlet grille for any chip?
Is there any chip?
Go to Step 4. Go to Step 5.
4
C lear all chip.
Is the operation finished?
Go to Step 15. —
5
C heck if the carpet is moist.
I s the carpet moist?
Go to Step 6. Go to Step 14.
6
C heck the existence of the conditons below:
L eak at front windshield periphery
D rain pipe blockage of air heater, ventilation and A/C system module
L eak at door seal
I s there any leak?
Go to Step 7. Go to Step 14.
7
Repair leak when necessary.
Is the maintenance finished?
Go to Step 15. —
8 Does the odour smell like coolant? Go to Step 9. Go to Step 12.
9
Check cooling system for any leak.
I s there any leak?
Go to Step 10. Go to Step 12.
10
C heck vehicle inside for coolant leak or check the front windshield for a
layer of film.
I s there any fault?
Go to Step 11. Go to Step 15.
11
Replace the heater core.
Is the maintenance finished?
Go to Step 15. —
12 Does the odour smell like engine oil? Go to Step 13. Go to Step 15.
13
①
Check engine compartment for any leak.
② Repair leak.
Is the maintenance finished?
Go to Step 15. —
14
M usty taste is probably caused by molds on evaporator and heater core or
inside air heater, ventilation and A/C system module assembly.
Is the operation finished?
Go to Step 15. —
15 Run the system to check the maintenance result. System is normal. Go to Step 2.
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