AT
AT
AT
AT Air
Air
Air
Air Conditioner
Conditioner
Conditioner
Conditioner
- 180 -
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
4. R efrigerating system noise diagnosis.
Step Operation
Yes
No
1
Whether or not to conduct this diagnosis based on “ A/C system
symptom s ” or instruction of other diagnosis tables?
Go to Step 2. —
2
Check accessory drive belt and drive belt tensioner for failure and conduct
troubleshooting when necessary.
Go to Step 3. —
3
Run the engine to check compressor for any abnormal noise:
Does the noise last for over 30 seconds?
Go to Step 5. Go to Step 4.
4
L et the engine run for several minutes.
S top the engine for 1 minute.
Res tart the engine.
I s any noise detected by using this procedure?
Go to Step 6.
G eneration of liquid
slugging noise is a
common
phenomenon, which
shall occur when the
system experience a
long time of shutdown
under high
temperature and the
ambient temperature
lowers after a whole
night.
5
C heck if the refrigerant level in system is too low.
I s the system refrigerant sufficient?
Go to Step 7. Go to Step 8.
6
Check if the heat expansion valve is stuck at closed or open position.
I s the heat expansion valve is stuck at open position?
R eplace expansion
valve.
Go to Step 7.
7
C heck if the compressor bolt and/or A/C pipeline scratches body parts.
I s the mounting bolt loosened?
T ighten bolt and/or
rearrange pipeline.
Go to Step 8.
8
① R ecover refrigerant and replace compressor.
② Refill the system.
I s the gas pressure within the specified range?
T he system inspection is
finished.
Go to Step 1
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