The radiator prevents the engine block from overheating. When the coolant gets too hot, the radiator boils over.
There are several possible causes:
Seal problems- One of the three internal seals has been damaged, causing the pressure levels to change which in turn causes the coolant to expand and boil over.
Head gasket problem- Head gasket failure affects water circulation. The water pump can’t circulate coolant, so the car overheats.
Radiator cap- There are three seals in the radiator cap which control coolant flow. If one fails, it affects coolant circulation.
Radiator fan- Used to cool the car when not in motion. If this fan isn’t working, the engine will naturally accumulate more heat.
Thermostat- The thermostat regulates coolant temperature. When the thermostat isn’t functioning correctly, radiator problems naturally occur.
Coolant levels- Insufficient coolant naturally can’t cool the engine.
Coolant quality- Some coolants are better than others.
Quick fix- These problems are easy enough to find, but they need to be fixed, fast. Overheating can damage the engine, and that costs big money. Faulty parts simply have to be replaced. If you’ve got problems like these, a quick call to a mobile mechanic will get them fixed fast.
Source: http://www.ehow.com/list_7246834_causes-car-radiator-overheating-boiling.html
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