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COOLING SYSTEM
TROUBLESHOOTING
Engine temperature too high
• Faulty high coolant temperature indicator or ECT sensor
• Thermostat stuck closed
• Faulty radiator cap
• Insufficient coolant
• Passage blocked in radiator, hoses or water jacket
• Air in system
• Faulty cooling fan motor
• Faulty FAN CONT. RELAY
• Faulty water pump
Engine temperature too low
• Faulty high coolant temperature indicator or ECT sensor
• Thermostat stuck open
• Faulty FAN CONT. RELAY
Coolant leak
• Faulty water pump mechanical seal
• Deteriorated O-rings
• Faulty radiator cap
• Damaged or deteriorated cylinder head gasket
• Loose hose connection or clamp
• Damaged or deteriorated hose
• Damaged radiator
8-4
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