AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 186 -
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
9. Diagnosis of poor A/C system refrigeration.
Step Operation
Yes
No
1
C heck 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
① Turn the ignition switch to ON position with the engine off.
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
① Start the engine.
②
Use the fault diagnosis instrument to clear all fault codes stored in air
heater, ventilation and A /C system control module.
③ Set the left side air temperature switch to coldest position.
④
Set the mode switch to “ TO-FACE/FEET ” position.
⑤ Set the blower motor switch to high speed position.
Does the A/C compressor run?
Go to Step 6. Replace compressor.
6
Conduct A/C system performance test.
Is the fault detected and eliminated?
Go to Step 9. Go to Step 7.
7
Install a temperature gauge near the interior air temperature sensor.
I s the indicated temperature below 3 ℃ (5 ° F) ?
Go to Step 9. Go to Step 8.
8
C heck air suction pipe for leak or blockage.
Is the fault detected and eliminated?
Go to Step 9. —
9
Run the system to check the maintenance result.
Is the fault eliminated?
System is normal. Go to Step 1
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