Top 5 Causes Of Coolant Boiling And ( How To Fix Them )

Coolant boiling inside the expansion tank or radiator is never normal and often indicates serious engine overheating.
In this video, we break down the real mechanical reasons behind coolant boiling, explained in a clear and professional way—just like Engineering Explained and ScannerDanner.
You’ll learn how issues such as a blown head gasket, cooling fan failure, stuck thermostat, water pump malfunction, and a faulty radiator or expansion tank cap can lead to excessive heat, pressure buildup, and coolant boiling.
This video is designed to help you diagnose overheating problems correctly, avoid unnecessary repairs, and protect your engine from severe damage.
🔧 Topics covered in this video:
•Why coolant boils in the radiator or expansion tank
•How combustion pressure enters the cooling system
•Cooling fan operation and heat dissipation
•Thermostat function and failure modes
•Water pump flow issues
•Cooling system pressure and radiator cap failure
If you’re dealing with engine overheating, coolant loss, or boiling coolant, this video will help you understand what’s really going on under the hood.
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