Lifan 620. Service manual - part 78
4) Dust deposit or deformation of heater fins, and poor ventilation—clean or replace the heater;
5) The hot-water pipe of heater is blocked by scale deposit—replace the heater;
6) Insufficient engine cooling water—check whether leakage exists in cooling system, repair it and
replenish cooling water;
7) Failure of engine thermostat—replace the thermostat;
8) Air exists in the heater core barrel—expel air in the pipe.
ii. Fault diagnosis table of air conditioning system
Table 6-2
new one.
High pressure is low,
low pressure high
2. Air duct is blocked.
Adjust jaw opening of expansion valve or
replace with a new expansion valve.
1. Stop the machine, low pressure
increases quickly—system ice plug.
Replace with a new drier-receiver.
High pressure is low,
low pressure negative
2. Stop the machine, low pressure
increases slowly—system ice plug.
Clean the system.
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