Honda SH125 Manual page 136

COOLING SYSTEM
TROUBLESHOOTING
Engine temperature too high
Insufficient coolant
Air i n system
Faulty radiator cap
Thermostat stuck closed
Passage blocked in radiator, hoses or water jacket
Faulty water pump
Faulty cooling fan motor or fan motor circuit
Faulty coolant temperature gauge circuit or ECT sensor (page 20-1 1)
Engine temperature too low
Thermostat stuck open
Faulty cooling fan motor or fan motor circuit
Faulty coolant temperature gauge circuit or ECT sensor (page 20-1 1)
Coolant leaks
Faulty water pump mechanical seal
Deteriorated O-rings
Damaged or deteriorated seals and gaskets
Faulty radiator cap
Loose hose connection or clamp
Damaged or deteriorated hoses
6-5