6-2
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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