Why Does Coolant Get Hot?

[AlexAnn]

The reasons why coolant gets hot are as follows: 1. Insufficient engine coolant; 2. Faulty water temperature sensor or gauge; 3. Driving with a tailwind or prolonged low-speed, high-load driving in hot seasons; 4. Ignition timing too early or too late; 5. Louvers not fully opening; 6. Air-fuel mixture too lean or too rich; 7. Radiator exterior dirty or severe internal scaling, leading to poor heat dissipation—requires flushing (cleaning) the radiator or replacement; 8. Fan clutch engagement too late, cooling fan not working, or excessive fan rotation resistance; 9. Electric fan performance issues or lack of high-speed operation; 10. Excessive carbon buildup in the combustion chamber; 11. Loose water pump belt; 12. Issues with the catalytic converter; 13. Caused by gas passing through water in a "blow-by" phenomenon; 14. Thermostat not opening properly—requires replacement; 15. Blockages in other hoses, elbows, or water passages; 16. Poor water pump performance (insufficient coolant circulation).