Intermittent Temperature Decreasing Of Air Conditioner; Noise Of Air Conditioner Is Too Loud; Insufficient Warm Air Of Air Conditioner - Lifan 620 Maintenance Manual

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sometime accompanying abnormal knocking. Change the compressor.
5) Compressor drive belt is too loose—compressor rotation speed is too slow, outlet air is not cold,
noise of belt skidding can be heard. Strain the drive belt or replace it.
6) Compressor clutch skidding—compressor can not work normally. Disassemble the clutch,
repair or replace it;
7) Little heat releasing air flow of condenser—both high pressure and low pressure are too high.
Check whether blower is working normally and whether wind speed switch is in normal condition;
8) Condenser fins are blocked by dust—high pressure is too high, together with poor heat
eliminating effect. Clean dust on the condenser;
9) Evaporator fins are blocked by dust—air output decreases. Clean the dust by blowing with
nitrogen and compressed air;
10) Evaporator air cleaner is blocked by dust or foreign matters—air output decreases. Clean or
replace the air cleaner;
11) Too big jaw opening of expansion valve—both high pressure and low pressure are too high,
excessive refrigerant flows through evaporator and can not evaporate completely. Replace
expansion valve;
12) Leakage of expansion valve power head—both high pressure and low pressure are on the
lower side. Replace expansion valve;
13) Improper adjustment of thermostat—frequent starting, influencing air conditioning effect.
Replace or re-adjust the thermostat;
14) Too much lubricant in system—both high pressure and low pressure are on the higher side,
clouding stripes appear in sightglass. Expel redundant lubricant.
15) Fresh air door of air conditioner is not closed completely—a lot of high temperature air enters
vehicle from the outside. Close the fresh air door completely;
16) HVAC cool & warm air door is not closed completely—air is heated. Close the cool & warm air
door completely;
17) Air supply pipeline is blocked—air output is little, noises increase. Eliminate blockage in the
pipeline.

3. Intermittent temperature decreasing of air conditioner

The main reasons are system ice plug, faults of temperature controller and relay and compressor
clutch skidding and poor contact of coils, etc.:
1) Faults of controller and relay, compressor clutch skidding and poor contact of coils, etc.
2) Unfirm contact of compressor clutch coil, poor ground connection and loose connection—clutch
separates too early when working. Fasten the joint.
3) Abnormal temperature controller—severe frost appears on evaporator surface, no cool air
vented. Replace the temperature controller.

4. Noise of air conditioner is too loud

1) Noises of blower, compressor, drive belt and part collision, etc.
2) Noise of expansion valve operation.

5. Insufficient warm air of air conditioner

1) Damage of blower motor—check the blower motor, repair or replace it;
2) Air leakage of heater—replace sealant pad;
3) Abnormal jaw opening of cool & warm air door—check the working mode of the cool & warm air
door;
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