Check Of Refrigerant - Lifan 620 Maintenance Manual

Phenomenon & state
1. Inlet air cleaner is blocked.
2. Air duct is blocked.
Normal
voltage
3. Evaporator surface dust
Insufficient
4. Blower motor works stagnantly.
air output
1. Vehicle power supply voltage is
unstable.
Insufficient
voltage
2. Fault of power grounding exists
High pressure can not
Clutch or belt is skidding.
reach a certain value
1. Poor evaporator temperature sensor.
2. Evaporator temperature sensor wire
harness and insert are in poor condition.
Evaporator is frozen
3. Excessive refrigerant.
4. Air capacity passing through
evaporator is insufficient.
5. Failure of expansion valve.
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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Table 6-2 (Continued)
Cause analysis
314
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Measure
Replace with a new inlet air cleaner core.
Clean air duct.
Clean the evaporator surface.
Inspect the blower motor, or replace with a
new one.
Inspection.
Inspect or replace the clutch or the belt.
Replace it or check the correctness of the
sensing head position.
Inspection.
Expel some of the refrigerant.
Check whether blower speed is normal.
Replace it.