Honda Metropolitan CHF50 Service Manual page 118

COOLING SYSTEM
TROUBLESHOOTING
Engine temperature too high
• Thermostat stuck closed
• Faulty radiator cap
• Insufficient coolant
• Passage blocked in radiator, hoses or water jacket
• Air in system
• Faulty water pump
• Faulty temperature gauge or ECT sensor
Engine temperature too low
• Faulty temperature gauge or ECT sensor
• Thermostat stuck open
Coolant leak
• Deteriorated O-rings
• Faulty radiator cap
• Damaged or deteriorated cylinder head gasket
• Loose hose connection or clamp
• Damaged or deteriorated hoses
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