Coolant drops below the safe range the engine needs to operate
The engine requires a certain amount of coolant for proper operation. If the coolant level is insufficient, the engine may overheat as not enough coolant is circulating to cool it. Some vehicles have a low coolant warning light to indicate a drop in the coolant level.
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Coolant System Leak
A worn or broken radiator hose will leak coolant. The hoses are flexible and made of rubber. Under normal driving conditions, these hoses can wear and develop holes.
A damaged radiator can leak coolant as well.