1. Coolant Boiling: If the coolant in the overflow tank is boiling, it means the engine is overheating. This could be caused by several issues, such as a coolant leak, a faulty thermostat, a broken water pump, or a damaged radiator.
2. Air in the Cooling System: The presence of air bubbles in the cooling system can also cause the coolant to boil. Air pockets often occur when the cooling system is not properly filled or if there is a leak in the system.
3. Head Gasket Failure: A blown head gasket can allow combustion gases to leak into the cooling system, causing the coolant to bubble and overflow. This is a severe problem that requires immediate attention.
4. Faulty Radiator Cap: A malfunctioning radiator cap cannot properly maintain pressure in the cooling system, leading to boiling and bubbling of the coolant.
5. Low Coolant Level: If the coolant level in the overflow tank is too low, it can cause the system to overheat and bubble.
It is essential to identify and address the underlying cause of the bubbling overflow tank to prevent further damage to the engine. If you suspect that the engine is overheating, turn off the engine and allow it to cool down. Once it is safe to do so, check the coolant level, inspect for any leaks, and consult a mechanic for a proper diagnosis and repair.
