What happens to a motor if you mix two different antifreeze coolants in the engine?

Mixing two different antifreeze coolants can lead to chemical reactions that may produce sludge or precipitates, reducing the coolant's effectiveness. This can result in overheating, corrosion of engine components, and potential damage to the cooling system. Additionally, the mixed coolants may have incompatible properties, such as differing freeze and boil points, which can compromise engine performance. Regular maintenance and using the same type of coolant is essential to prevent these issues.