* Cooling System Leaks: This is a very common culprit. Leaks can occur in the radiator, hoses, water pump, thermostat housing, or even the engine block itself. Loss of coolant means less liquid to absorb heat.
* Faulty Thermostat: A thermostat that's stuck closed prevents coolant from circulating until the engine reaches dangerously high temperatures. Conversely, one that's stuck open might not allow the engine to reach optimal operating temperature, leading to other issues, though less likely to cause an immediate overheat.
* Water Pump Failure: The water pump circulates the coolant. If it fails, coolant won't flow, leading to overheating. This often manifests as a lack of coolant flow even when the engine is running.
* Radiator Problems: A clogged radiator (due to sediment buildup or debris), a damaged radiator core (causing leaks), or a faulty radiator fan will all prevent efficient heat dissipation.
* Low Coolant Level: This is often linked to leaks, but can also be due to simple neglect. Always check the coolant level regularly.
* Fan Problems: If the radiator fan isn't working properly (either the fan motor itself or its clutch), the radiator won't be able to cool the coolant effectively.
* Head Gasket Failure: A blown head gasket allows coolant to leak into the cylinders or oil, leading to overheating and other serious engine problems (like white smoke from the exhaust). This is a much more serious issue.
* Blocked Airflow: If airflow to the radiator is restricted (e.g., by debris or a damaged shroud), the radiator won't be able to dissipate heat properly.
To diagnose the problem, you'll need to inspect the cooling system thoroughly. Check for leaks, examine the hoses, test the thermostat, check the coolant level, and make sure the radiator fan is working correctly. If you're not comfortable doing this yourself, take it to a qualified mechanic for proper diagnosis and repair.
