The following conditions may cause the engine to overheat:
1. Aging water pump 2. Loose water pump belt
3. Clogged engine water channel
4. Clogged radiator
5. Clogged radiator air duct
6. Exterior of the engine is too dirty
7. Aging engine oil and poor lubrication
8. Poor air flow to the radiator
10. Aging thermostat
11. Cylinder head gasket leak
12. Early or late ignition timing
13. Aging fuel injectors and poor atomization
14. Aging engine and lack of power
15. Overload
16. The engine is too small
17. Incorrect valve clearance
18. Clogged air filter
19. Braking
20. Leaking valves
21. High temperature
22. Leaking water pipes
23. Water shortage
24. Clogged heater
25. Clogged water pipes or heater ducts