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7. Cooling system
Know Before Service
1. Please refer to the radiator section of the "Maintenance" chapter of this manual for the corresponding precautions for the
coolant (antifreeze).
2.
C
heck the cooling water pipe; check the height of the cooling liquid, adding and discharging the cooling liquid have been
described in detail in the radiator section of the "Maintenance" chapter, and this chapter will not be repeated.
Tool:
Hoop clamp Multimeter
Air source with adjustable
air pressure
Homemade cover*
*It can be blocked with a soft rubber plug, or folded in half with a hose and tied up with a rope or wire as a plug for the small
pipe to test the sealing of the water tank filling port. You can find a water pipe with an inner diameter of 16mm to cut off
a
s
ection, and use a suitable air pipe joint and clamp to assemble it firmly at the other end to test the air tightness of the water
tank filling port, the main water tank, and the small water tank.
●
When the engine is not completely cooled, opening the water tank cover may cause the coolant to spray out and cause burns.
The water tank cover must be opened after the water tank and engine have cooled down.
Troubleshooting
1.
T
he engine temperature is too high:
a. The coolant temperature of the meter is abnormal or the water temperature sensor is abnormal;
b.
T
he thermostat is abnormal;
c.
I
nsufficient coolant;
d. The radiator, water pipe, and water tank are blocked;
e.
T
here is air entering the cooling system;
f.
T
he cooling fan is faulty;
g. Cooling fan relay failure (see the EFI relay section in the "Electronic Fuel Injection System" chapter).
2. The engine temperature is too low:
a. The coolant temperature of the meter is abnormal or the water temperature sensor is abnormal;
b.
T
he thermostat is abnormal;
c.
Th
e cooling fan relay is faulty (see the EFI relay section in the "Electronic Fuel Injection System" chapter).
3. Coolant leakage
a. Water pump seal failure;
b
. O
-ring is damaged or aging failure;
c.
T
he radiator cover is damaged;
d. The gasket is damaged or aging failure;
e.
W
ater pipe rupture;
f.
T
he radiator is damaged.
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