What causes coolant smell from exhaust?

A coolant smell from the exhaust typically indicates that coolant is entering the combustion chamber, often due to a blown head gasket, a cracked engine block, or a damaged cylinder head. This can lead to coolant burning alongside fuel, producing a sweet-smelling exhaust. Additionally, it can result in engine overheating and potential damage if not addressed promptly. Regular checks and maintenance can help prevent such issues.