AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 187 -
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
10. Diagnosis for insufficient warm air.
Step Operation
Yes
No
1
Check the operation of air mixing damper to confirm no blockage or
rupture.
I s air mixing damper blocked or ruptured?
R eplace actuator. Go to Step 2.
2
Turn the blower motor switch to each speed position.
Is the blower motor able to operate at each speed position?
Go to Step 3. Go to “ Fault 7 ”
3 D oes blower motor run at corresponding speed? Go to Step 4. Go to “ Fault 8 ”
4
① Start the engine.
②
Set the mode switch to “ TO-Face ” mode.
③ Set the internal circulation switch to “ ON ” position.
④
Observe the internal circulation damper .
⑤ Set the internal circulation switch to “ O FF ” position.
D oes the internal circulation damper transfer from internal circulation to
ventilation?
Go to Step 5.
Go to “ Internal Air
Circulation Fault
Diagnosis Help ” in
“ Automatic Air
Heater , Ventilation
and A/C System ” .
5
Set the temperature switch to “ O FF ” position.
W hen heating or defrosting is applied, is it still cold?
Go to Step 6. Go to Step 9.
6
① Start the engine.
②
Shut down the air heater, ventilation and A/C control system.
Does the A/C compressor run?
Replace compressor. Go to Step 8.
7
Check cooling system for:
T
oo low coolant level.
L ooseness or wear of accessory drive belt.
L eak of radiator hose or heater hose.
Distortion of radiator hose or heater hose.
L ack of radiator cap pressure seal.
L eak of radiator cap.
Is the fault detected and eliminated?
Go to Step 10. Go to Step 8.
8
①
Set the mode switch to “ TO-FACE ” mode.
② Turn the ignition switch to ON position with the engine off.
③
Set the blower motor switch to maximum speed position.
④ Cover the sensor air inlet with a piece of paper of 5mm
2
(2 square
inch) to check whether there is any airflow through the interior air
temperature sensor.
I s the paper still at the original position?
Go to Step 10. Go to Step 9.
9
Check aspirator pipeline for leak or blockage.
Is the fault detected and eliminated?
Go to Step 10. —
10
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal. Go to Step 2.
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