Table 6-2 (Continued)
Phenomenon & state Cause analysis Measure
1. Inlet air cleaner is blocked. Replace with a new inlet air cleaner core.
2. Air duct is blocked. Clean air duct.
3. Evaporator surface dust Clean the evaporator surface.
Normal
voltage
4. Blower motor works stagnantly.
Inspect the blower motor, or replace with a
new one.
1. Vehicle power supply voltage is
unstable.
Insufficient
air output
Insufficient
voltage
2. Fault of power grounding exists
Inspection.
High pressure can not
reach a certain value
Clutch or belt is skidding. Inspect or replace the clutch or the belt.
1. Poor evaporator temperature sensor.
Replace it or check the correctness of the
sensing head position.
2. Evaporator temperature sensor wire
harness and insert are in poor condition.
Inspection.
3. Excessive refrigerant. Expel some of the refrigerant.
4. Air capacity passing through
evaporator is insufficient.
Check whether blower speed is normal.
Evaporator is frozen
5. Failure of expansion valve. Replace it.
iii. Check of refrigerant
1. Check refrigerant quantity, observing through the observing glass window on the air conditioner
pipe
Note: If refrigerant is sufficient and ambient temperature is higher than normal, viewing air bubbles
through the observing glass window can be identified to be in normal condition.
Test condition:
① Engine speed: 1500r/min;
② Blower speed control speed: HI “high”;
③ Air conditioner switch: on;；
④ Temperature control panel: MAX COLD “maximum refrigeration”;
⑤ Fully open the vehicle door.
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