What can cause a car's engine to overheat?
by 
enuezie kingsley
ANSWERS: 4
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Low coolant level; bad thermostat; bad water pump; leaking hoses; in computer-controlled car, bad engine temperature sensor/relay.
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Also, A leaking or blown head gasket
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The above listed (coolant, thermostat, water pump, leaks, bad computer sensor) cause 80% of overheating problems are also the most common factors. The other 20% is composed by: -Rusty system: Never use only water. Always use coolant or a combination of water / coolant. Water will generate corrosion. If you suspect a rusty system, you can use anti-corrosive aditives. -Plugged radiator: Usually by rust or debris in the system. A cooling system flush can help. -Low engine oil / Old engine oil: Heat is created by friction. Oil help reducing friction. No oil / old oil will result in overheating. -Bad cooling fan: When no working is usually broken or the sensor is not working. Of course, besides of this technical factors, pushing the car to the limit will result in overheating (high RPM during a prolonged period of time).
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1. Engine Water Cooling System as mentioned 2. Combustion Chamber (valves blown/seats, piston/piston ring wear/damaged, blown gasket) For turbo engine, you might have even more long list
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