DAELIM VJF125 Service Manual page 103

COOLING SYSTEM
TROUBLESHOOTING
Engine temperature too high
Faulty temperature gauge or thermo sensor
Air in cooling system
Faulty thermostat stuck (Thermostat stuck closed)
Passages blocked in radiator, hoses or water jacket
Faulty fan motor switch
Faulty water pump
Engine temperature too low or unstable
Faulty temperature gauge or thermo sensor
Faulty thermostat stuck (Thermostat stuck open)
Faulty fan motor switch
Coolant leaks
Faulty water pump mechanical seal
Damaged or deteriorated O-rings
Faulty radiator cap
Damaged or deteriorated gasket
Loose hose connection or clamp
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